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#1
posted to rec.boats
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need some mechanics input on a nightmareboat!
hi all,
i am at my wits end over this 2003 bayliner 5.0L merc. here is the symptom: give it some warmpup throttle action, turn key on, she cranks beautifully. no smoke. no roughness. 10-20 seconds later, she instantly cuts off. so.. youre thinking.. it must be a fuel thing, right? i started small: i replaced the fuel filter. same result. a little larger: i replaced the fuel pump (it's an electronic fuel pump, we tested with it unhooked from carb and it was a weak stream.. after replacement she was peein' strong). same result. a little larger: i replaced the ignition coil. same result. a little larger: i rebuilt the carb. at this point, she showed promise. we took her out on the lake for about an hour and she ran beautifully!! i let her sit for a week .. then bam, same damn result as before!! 10-20 second purr then cut off. so i said damn it, let's look at the carb again. no fuel is getting down in the manifold after the initial warmup throttle action!! so figured something is messed up with carb.. went down and bought a fresh rebuilt carb.. last night.. put it on.. same result! and i still don't see fuel dropping into the 2 barrels after crankup. it does make a noise like it's spraying air or something at least. but it was somewhat dark when i was observing it this time... the guy i bought the boat from had done a lot of wiring himself (mp3 player, gps..) .. could it be some electrical shorting after 10-20 seconds or would it only be a startup thing? my next order of business is going at it from the distributor system. maybe the distributor chip is bad? distributor cap? what else could it be!! man this is driving me nuts. that engine is practically new at this point!! also, what do you think about some crap in the fuel? i filled the damn tank up from about 3 gallons.. but what if there is dirt or water or something in the tank and it keeps suckin' up dirt? should i drain the 40 gallon tank.. and clean the tank somehow (never done that.. whats the best way to do it?) give that a shot? the one thing that leads me to believe it isnt the tank is that when i warmup throttle action it pushes fuel down the manifold so the fuel filter seems to be fine? maybe just not fine all the time? any suggestions would be great. i've had it in and out of the shop and they had it fixed at one point but then 1 week later it died again (without me doing anything in between then). i'm tempted to sell the boat, get something else, but i am in it $12K and who is going to buy an '03 bayliner 21.5ft that doesnt run for anywhere near that?? best bet is to get it running, then sell it, i guess, or maybe keep it since ive grown attached : thank you so much for your time reading this, kyle |
#2
posted to rec.boats
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need some mechanics input on a nightmareboat!
"kyle" wrote in message oups.com... hi all, i am at my wits end over this 2003 bayliner 5.0L merc. here is the symptom: give it some warmpup throttle action, turn key on, she cranks beautifully. no smoke. no roughness. 10-20 seconds later, she instantly cuts off. so.. youre thinking.. it must be a fuel thing, right? i started small: i replaced the fuel filter. same result. a little larger: i replaced the fuel pump (it's an electronic fuel pump, we tested with it unhooked from carb and it was a weak stream.. after replacement she was peein' strong). same result. a little larger: i replaced the ignition coil. same result. a little larger: i rebuilt the carb. at this point, she showed promise. we took her out on the lake for about an hour and she ran beautifully!! i let her sit for a week .. then bam, same damn result as before!! 10-20 second purr then cut off. so i said damn it, let's look at the carb again. no fuel is getting down in the manifold after the initial warmup throttle action!! so figured something is messed up with carb.. went down and bought a fresh rebuilt carb.. last night.. put it on.. same result! and i still don't see fuel dropping into the 2 barrels after crankup. it does make a noise like it's spraying air or something at least. but it was somewhat dark when i was observing it this time... the guy i bought the boat from had done a lot of wiring himself (mp3 player, gps..) .. could it be some electrical shorting after 10-20 seconds or would it only be a startup thing? my next order of business is going at it from the distributor system. maybe the distributor chip is bad? distributor cap? what else could it be!! man this is driving me nuts. that engine is practically new at this point!! also, what do you think about some crap in the fuel? i filled the damn tank up from about 3 gallons.. but what if there is dirt or water or something in the tank and it keeps suckin' up dirt? should i drain the 40 gallon tank.. and clean the tank somehow (never done that.. whats the best way to do it?) give that a shot? the one thing that leads me to believe it isnt the tank is that when i warmup throttle action it pushes fuel down the manifold so the fuel filter seems to be fine? maybe just not fine all the time? any suggestions would be great. i've had it in and out of the shop and they had it fixed at one point but then 1 week later it died again (without me doing anything in between then). i'm tempted to sell the boat, get something else, but i am in it $12K and who is going to buy an '03 bayliner 21.5ft that doesnt run for anywhere near that?? best bet is to get it running, then sell it, i guess, or maybe keep it since ive grown attached : thank you so much for your time reading this, kyle If it were a car I would start wondering about fuel pump. Or vent on the gas tank. If the bowl on the carb is dry when it dies then no gas getting to motor. problem is fuel pump, gas line, tank etc. |
#3
posted to rec.boats
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need some mechanics input on a nightmareboat!
fuel pump has been replaced .. it gushes fuel out the line when removed
from the carb. intake and i'm turning the key over... how could it be a gas vent thing? where is the vent, anyways.. is it between the gas tank and the fuel filter? don't know if i mentioned but it is an I/O. Del Cecchi wrote: "kyle" wrote in message oups.com... hi all, i am at my wits end over this 2003 bayliner 5.0L merc. here is the symptom: give it some warmpup throttle action, turn key on, she cranks beautifully. no smoke. no roughness. 10-20 seconds later, she instantly cuts off. so.. youre thinking.. it must be a fuel thing, right? i started small: i replaced the fuel filter. same result. a little larger: i replaced the fuel pump (it's an electronic fuel pump, we tested with it unhooked from carb and it was a weak stream.. after replacement she was peein' strong). same result. a little larger: i replaced the ignition coil. same result. a little larger: i rebuilt the carb. at this point, she showed promise. we took her out on the lake for about an hour and she ran beautifully!! i let her sit for a week .. then bam, same damn result as before!! 10-20 second purr then cut off. so i said damn it, let's look at the carb again. no fuel is getting down in the manifold after the initial warmup throttle action!! so figured something is messed up with carb.. went down and bought a fresh rebuilt carb.. last night.. put it on.. same result! and i still don't see fuel dropping into the 2 barrels after crankup. it does make a noise like it's spraying air or something at least. but it was somewhat dark when i was observing it this time... the guy i bought the boat from had done a lot of wiring himself (mp3 player, gps..) .. could it be some electrical shorting after 10-20 seconds or would it only be a startup thing? my next order of business is going at it from the distributor system. maybe the distributor chip is bad? distributor cap? what else could it be!! man this is driving me nuts. that engine is practically new at this point!! also, what do you think about some crap in the fuel? i filled the damn tank up from about 3 gallons.. but what if there is dirt or water or something in the tank and it keeps suckin' up dirt? should i drain the 40 gallon tank.. and clean the tank somehow (never done that.. whats the best way to do it?) give that a shot? the one thing that leads me to believe it isnt the tank is that when i warmup throttle action it pushes fuel down the manifold so the fuel filter seems to be fine? maybe just not fine all the time? any suggestions would be great. i've had it in and out of the shop and they had it fixed at one point but then 1 week later it died again (without me doing anything in between then). i'm tempted to sell the boat, get something else, but i am in it $12K and who is going to buy an '03 bayliner 21.5ft that doesnt run for anywhere near that?? best bet is to get it running, then sell it, i guess, or maybe keep it since ive grown attached : thank you so much for your time reading this, kyle If it were a car I would start wondering about fuel pump. Or vent on the gas tank. If the bowl on the carb is dry when it dies then no gas getting to motor. problem is fuel pump, gas line, tank etc. |
#4
posted to rec.boats
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need some mechanics input on a nightmareboat!
----------------
Another idea I wanted to run past all of you: what do you think if it's something related to my oil pressure being messed up, and cutting off the fuel intake line from entering the carb? How does one easily test this ? What test equipment do I need? ---------------- One last idea (got this from the manual last night) If an engine running problem is diagnosed as fuel starvation, check the anti-siphon valve. If the valve is stuck or clogged, change or replace it while the engine is shut down. · NEVER run the engine with the anti-siphon valve removed, except in an emergency. Anti-siphon Valve · Your boat is equipped with an anti-siphon valve, which is an integral part of fuel system. · The valve is located at the point where the fuel feed line attaches to the fuel tank. · The valve is spring loaded and is opened by fuel pump vacuum. · This valve will prevent fuel from siphoning from the tank in the event of a fuel line rupture. ----------------- Regarding the anti-siphon valve.. would ANY fuel be coming out if this were the issue, or could this activate after 10-20 seconds?? That would be insane if that was the issue!!! kyle wrote: fuel pump has been replaced .. it gushes fuel out the line when removed from the carb. intake and i'm turning the key over... how could it be a gas vent thing? where is the vent, anyways.. is it between the gas tank and the fuel filter? don't know if i mentioned but it is an I/O. Del Cecchi wrote: "kyle" wrote in message oups.com... hi all, i am at my wits end over this 2003 bayliner 5.0L merc. here is the symptom: give it some warmpup throttle action, turn key on, she cranks beautifully. no smoke. no roughness. 10-20 seconds later, she instantly cuts off. so.. youre thinking.. it must be a fuel thing, right? i started small: i replaced the fuel filter. same result. a little larger: i replaced the fuel pump (it's an electronic fuel pump, we tested with it unhooked from carb and it was a weak stream.. after replacement she was peein' strong). same result. a little larger: i replaced the ignition coil. same result. a little larger: i rebuilt the carb. at this point, she showed promise. we took her out on the lake for about an hour and she ran beautifully!! i let her sit for a week .. then bam, same damn result as before!! 10-20 second purr then cut off. so i said damn it, let's look at the carb again. no fuel is getting down in the manifold after the initial warmup throttle action!! so figured something is messed up with carb.. went down and bought a fresh rebuilt carb.. last night.. put it on.. same result! and i still don't see fuel dropping into the 2 barrels after crankup. it does make a noise like it's spraying air or something at least. but it was somewhat dark when i was observing it this time... the guy i bought the boat from had done a lot of wiring himself (mp3 player, gps..) .. could it be some electrical shorting after 10-20 seconds or would it only be a startup thing? my next order of business is going at it from the distributor system. maybe the distributor chip is bad? distributor cap? what else could it be!! man this is driving me nuts. that engine is practically new at this point!! also, what do you think about some crap in the fuel? i filled the damn tank up from about 3 gallons.. but what if there is dirt or water or something in the tank and it keeps suckin' up dirt? should i drain the 40 gallon tank.. and clean the tank somehow (never done that.. whats the best way to do it?) give that a shot? the one thing that leads me to believe it isnt the tank is that when i warmup throttle action it pushes fuel down the manifold so the fuel filter seems to be fine? maybe just not fine all the time? any suggestions would be great. i've had it in and out of the shop and they had it fixed at one point but then 1 week later it died again (without me doing anything in between then). i'm tempted to sell the boat, get something else, but i am in it $12K and who is going to buy an '03 bayliner 21.5ft that doesnt run for anywhere near that?? best bet is to get it running, then sell it, i guess, or maybe keep it since ive grown attached : thank you so much for your time reading this, kyle If it were a car I would start wondering about fuel pump. Or vent on the gas tank. If the bowl on the carb is dry when it dies then no gas getting to motor. problem is fuel pump, gas line, tank etc. |
#5
posted to rec.boats
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need some mechanics input on a nightmareboat!
kyle wrote:
fuel pump has been replaced .. it gushes fuel out the line when removed from the carb. intake and i'm turning the key over... how could it be a gas vent thing? where is the vent, anyways.. is it between the gas tank and the fuel filter? don't know if i mentioned but it is an I/O. Del Cecchi wrote: "kyle" wrote in message groups.com... hi all, i am at my wits end over this 2003 bayliner 5.0L merc. here is the symptom: give it some warmpup throttle action, turn key on, she cranks beautifully. no smoke. no roughness. 10-20 seconds later, she instantly cuts off. so.. youre thinking.. it must be a fuel thing, right? i started small: i replaced the fuel filter. same result. a little larger: i replaced the fuel pump (it's an electronic fuel pump, we tested with it unhooked from carb and it was a weak stream.. after replacement she was peein' strong). same result. a little larger: i replaced the ignition coil. same result. a little larger: i rebuilt the carb. at this point, she showed promise. we took her out on the lake for about an hour and she ran beautifully!! i let her sit for a week .. then bam, same damn result as before!! 10-20 second purr then cut off. so i said damn it, let's look at the carb again. no fuel is getting down in the manifold after the initial warmup throttle action!! so figured something is messed up with carb.. went down and bought a fresh rebuilt carb.. last night.. put it on.. same result! and i still don't see fuel dropping into the 2 barrels after crankup. it does make a noise like it's spraying air or something at least. but it was somewhat dark when i was observing it this time... the guy i bought the boat from had done a lot of wiring himself (mp3 player, gps..) .. could it be some electrical shorting after 10-20 seconds or would it only be a startup thing? my next order of business is going at it from the distributor system. maybe the distributor chip is bad? distributor cap? what else could it be!! man this is driving me nuts. that engine is practically new at this point!! also, what do you think about some crap in the fuel? i filled the damn tank up from about 3 gallons.. but what if there is dirt or water or something in the tank and it keeps suckin' up dirt? should i drain the 40 gallon tank.. and clean the tank somehow (never done that.. whats the best way to do it?) give that a shot? the one thing that leads me to believe it isnt the tank is that when i warmup throttle action it pushes fuel down the manifold so the fuel filter seems to be fine? maybe just not fine all the time? any suggestions would be great. i've had it in and out of the shop and they had it fixed at one point but then 1 week later it died again (without me doing anything in between then). i'm tempted to sell the boat, get something else, but i am in it $12K and who is going to buy an '03 bayliner 21.5ft that doesnt run for anywhere near that?? best bet is to get it running, then sell it, i guess, or maybe keep it since ive grown attached : thank you so much for your time reading this, Hook a timing light up to one of the plug wires, I like the inductive pickup type. Fire it up and run it while holding down the trigger on the light until the engine dies. Does the timing light stop firing the moment the trouble appears or does it keep going until the engine stops turning? That will help narrow down whether the ignition or fuel is the problem. |
#6
posted to rec.boats
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need some mechanics input on a nightmareboat!
"James Sweet" wrote in message news:9o75h.57$tb2.36@trnddc08... kyle wrote: fuel pump has been replaced .. it gushes fuel out the line when removed from the carb. intake and i'm turning the key over... how could it be a gas vent thing? where is the vent, anyways.. is it between the gas tank and the fuel filter? don't know if i mentioned but it is an I/O. Del Cecchi wrote: "kyle" wrote in message egroups.com... hi all, i am at my wits end over this 2003 bayliner 5.0L merc. here is the symptom: give it some warmpup throttle action, turn key on, she cranks beautifully. no smoke. no roughness. 10-20 seconds later, she instantly cuts off. so.. youre thinking.. it must be a fuel thing, right? i started small: i replaced the fuel filter. same result. a little larger: i replaced the fuel pump (it's an electronic fuel pump, we tested with it unhooked from carb and it was a weak stream.. after replacement she was peein' strong). same result. a little larger: i replaced the ignition coil. same result. a little larger: i rebuilt the carb. at this point, she showed promise. we took her out on the lake for about an hour and she ran beautifully!! i let her sit for a week .. then bam, same damn result as before!! 10-20 second purr then cut off. so i said damn it, let's look at the carb again. no fuel is getting down in the manifold after the initial warmup throttle action!! so figured something is messed up with carb.. went down and bought a fresh rebuilt carb.. last night.. put it on.. same result! and i still don't see fuel dropping into the 2 barrels after crankup. it does make a noise like it's spraying air or something at least. but it was somewhat dark when i was observing it this time... the guy i bought the boat from had done a lot of wiring himself (mp3 player, gps..) .. could it be some electrical shorting after 10-20 seconds or would it only be a startup thing? my next order of business is going at it from the distributor system. maybe the distributor chip is bad? distributor cap? what else could it be!! man this is driving me nuts. that engine is practically new at this point!! also, what do you think about some crap in the fuel? i filled the damn tank up from about 3 gallons.. but what if there is dirt or water or something in the tank and it keeps suckin' up dirt? should i drain the 40 gallon tank.. and clean the tank somehow (never done that.. whats the best way to do it?) give that a shot? the one thing that leads me to believe it isnt the tank is that when i warmup throttle action it pushes fuel down the manifold so the fuel filter seems to be fine? maybe just not fine all the time? any suggestions would be great. i've had it in and out of the shop and they had it fixed at one point but then 1 week later it died again (without me doing anything in between then). i'm tempted to sell the boat, get something else, but i am in it $12K and who is going to buy an '03 bayliner 21.5ft that doesnt run for anywhere near that?? best bet is to get it running, then sell it, i guess, or maybe keep it since ive grown attached : thank you so much for your time reading this, Hook a timing light up to one of the plug wires, I like the inductive pickup type. Fire it up and run it while holding down the trigger on the light until the engine dies. Does the timing light stop firing the moment the trouble appears or does it keep going until the engine stops turning? That will help narrow down whether the ignition or fuel is the problem. This has most likely been mentioned before, but just in case it hasn't .... The electric fuel pumps are wired (or supposed to be) through an oil pressure switch. Once the engine starts, the fuel pump will only run if there is oil pressure activating the switch. (the purpose is to ensure the fuel pump doesn't keep pumping fuel into the carb if the engine dies or is off. I believe that when you turn the key to the "start" position, the oil pressure switch is bypassed to allow the pump to run and the engine to start with no oil pressure. From the symptoms you described above, it may be that the oil pressure switch is bad or the wiring to and from it is bad. Eisboch |
#7
posted to rec.boats
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need some mechanics input on a nightmareboat!
This has most likely been mentioned before, but just in case it hasn't .... The electric fuel pumps are wired (or supposed to be) through an oil pressure switch. Once the engine starts, the fuel pump will only run if there is oil pressure activating the switch. (the purpose is to ensure the fuel pump doesn't keep pumping fuel into the carb if the engine dies or is off. I believe that when you turn the key to the "start" position, the oil pressure switch is bypassed to allow the pump to run and the engine to start with no oil pressure. From the symptoms you described above, it may be that the oil pressure switch is bad or the wiring to and from it is bad. Eisboch I find it interesting that no one, except me, seems to have achnowledged your point. Now that I have an electric fuel pump, that's the 1st thing I'd check. Also, with my new ... geez I like my new boat .... Volvo Penta, an alternator not working will cause the engine to cut out. So many relays to jumper just to get back to port :-) |
#8
posted to rec.boats
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need some mechanics input on a nightmareboat!
"Eisboch" wrote in message ... "James Sweet" wrote in message news:9o75h.57$tb2.36@trnddc08... kyle wrote: fuel pump has been replaced .. it gushes fuel out the line when removed from the carb. intake and i'm turning the key over... how could it be a gas vent thing? where is the vent, anyways.. is it between the gas tank and the fuel filter? don't know if i mentioned but it is an I/O. Del Cecchi wrote: "kyle" wrote in message legroups.com... hi all, i am at my wits end over this 2003 bayliner 5.0L merc. here is the symptom: give it some warmpup throttle action, turn key on, she cranks beautifully. no smoke. no roughness. 10-20 seconds later, she instantly cuts off. so.. youre thinking.. it must be a fuel thing, right? i started small: i replaced the fuel filter. same result. a little larger: i replaced the fuel pump (it's an electronic fuel pump, we tested with it unhooked from carb and it was a weak stream.. after replacement she was peein' strong). same result. a little larger: i replaced the ignition coil. same result. a little larger: i rebuilt the carb. at this point, she showed promise. we took her out on the lake for about an hour and she ran beautifully!! i let her sit for a week .. then bam, same damn result as before!! 10-20 second purr then cut off. so i said damn it, let's look at the carb again. no fuel is getting down in the manifold after the initial warmup throttle action!! so figured something is messed up with carb.. went down and bought a fresh rebuilt carb.. last night.. put it on.. same result! and i still don't see fuel dropping into the 2 barrels after crankup. it does make a noise like it's spraying air or something at least. but it was somewhat dark when i was observing it this time... the guy i bought the boat from had done a lot of wiring himself (mp3 player, gps..) .. could it be some electrical shorting after 10-20 seconds or would it only be a startup thing? my next order of business is going at it from the distributor system. maybe the distributor chip is bad? distributor cap? what else could it be!! man this is driving me nuts. that engine is practically new at this point!! also, what do you think about some crap in the fuel? i filled the damn tank up from about 3 gallons.. but what if there is dirt or water or something in the tank and it keeps suckin' up dirt? should i drain the 40 gallon tank.. and clean the tank somehow (never done that.. whats the best way to do it?) give that a shot? the one thing that leads me to believe it isnt the tank is that when i warmup throttle action it pushes fuel down the manifold so the fuel filter seems to be fine? maybe just not fine all the time? any suggestions would be great. i've had it in and out of the shop and they had it fixed at one point but then 1 week later it died again (without me doing anything in between then). i'm tempted to sell the boat, get something else, but i am in it $12K and who is going to buy an '03 bayliner 21.5ft that doesnt run for anywhere near that?? best bet is to get it running, then sell it, i guess, or maybe keep it since ive grown attached : thank you so much for your time reading this, Hook a timing light up to one of the plug wires, I like the inductive pickup type. Fire it up and run it while holding down the trigger on the light until the engine dies. Does the timing light stop firing the moment the trouble appears or does it keep going until the engine stops turning? That will help narrow down whether the ignition or fuel is the problem. This has most likely been mentioned before, but just in case it hasn't .... The electric fuel pumps are wired (or supposed to be) through an oil pressure switch. Once the engine starts, the fuel pump will only run if there is oil pressure activating the switch. (the purpose is to ensure the fuel pump doesn't keep pumping fuel into the carb if the engine dies or is off. I believe that when you turn the key to the "start" position, the oil pressure switch is bypassed to allow the pump to run and the engine to start with no oil pressure. From the symptoms you described above, it may be that the oil pressure switch is bad or the wiring to and from it is bad. Eisboch Not all are through a oil switch. My VW Rabbit had a relay that sensed points opening and closing. All should have a running sensing circuit. |
#9
posted to rec.boats
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need some mechanics input on a nightmareboat!
Make sure your filter is fine enough. For outboards, they recommend 10 micron.
You may have water in your fuel, especially if your using gasahol. Try a filter with a water seperator. Try replacing all your fuel lines if they are old. Give your tank a good inspection and cleaning, as well. You might also try a product called Quick Clean from Mercury in your gas to keep the carbs clean. Let us know if you fix it and what the solution turned out to be. Sherwin D. kyle wrote: hi all, i am at my wits end over this 2003 bayliner 5.0L merc. here is the symptom: give it some warmpup throttle action, turn key on, she cranks beautifully. no smoke. no roughness. 10-20 seconds later, she instantly cuts off. so.. youre thinking.. it must be a fuel thing, right? i started small: i replaced the fuel filter. same result. a little larger: i replaced the fuel pump (it's an electronic fuel pump, we tested with it unhooked from carb and it was a weak stream.. after replacement she was peein' strong). same result. a little larger: i replaced the ignition coil. same result. a little larger: i rebuilt the carb. at this point, she showed promise. we took her out on the lake for about an hour and she ran beautifully!! i let her sit for a week .. then bam, same damn result as before!! 10-20 second purr then cut off. so i said damn it, let's look at the carb again. no fuel is getting down in the manifold after the initial warmup throttle action!! so figured something is messed up with carb.. went down and bought a fresh rebuilt carb.. last night.. put it on.. same result! and i still don't see fuel dropping into the 2 barrels after crankup. it does make a noise like it's spraying air or something at least. but it was somewhat dark when i was observing it this time... the guy i bought the boat from had done a lot of wiring himself (mp3 player, gps..) .. could it be some electrical shorting after 10-20 seconds or would it only be a startup thing? my next order of business is going at it from the distributor system. maybe the distributor chip is bad? distributor cap? what else could it be!! man this is driving me nuts. that engine is practically new at this point!! also, what do you think about some crap in the fuel? i filled the damn tank up from about 3 gallons.. but what if there is dirt or water or something in the tank and it keeps suckin' up dirt? should i drain the 40 gallon tank.. and clean the tank somehow (never done that.. whats the best way to do it?) give that a shot? the one thing that leads me to believe it isnt the tank is that when i warmup throttle action it pushes fuel down the manifold so the fuel filter seems to be fine? maybe just not fine all the time? any suggestions would be great. i've had it in and out of the shop and they had it fixed at one point but then 1 week later it died again (without me doing anything in between then). i'm tempted to sell the boat, get something else, but i am in it $12K and who is going to buy an '03 bayliner 21.5ft that doesnt run for anywhere near that?? best bet is to get it running, then sell it, i guess, or maybe keep it since ive grown attached : thank you so much for your time reading this, kyle |
#10
posted to rec.boats
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need some mechanics input on a nightmareboat!
Kyle,
Geez, you've spent a heck of a lot of $$$ replaceing parts not known to be defective. This is because you have no troubleshooting skills. The good advice you've been getting from the group is based upon what you're saying, but it's very difficult to trouble shoot an engine via the written word. IMO, you'd have been way ahead to have taken your boat to a qualified Mercruiser mechanic. If, after all the time and money you've invested so far you've still not cured the problem, I recommend a qualified mecanic. Good luck. Butch "sherwindu" wrote in message ... Make sure your filter is fine enough. For outboards, they recommend 10 micron. You may have water in your fuel, especially if your using gasahol. Try a filter with a water seperator. Try replacing all your fuel lines if they are old. Give your tank a good inspection and cleaning, as well. You might also try a product called Quick Clean from Mercury in your gas to keep the carbs clean. Let us know if you fix it and what the solution turned out to be. Sherwin D. kyle wrote: hi all, i am at my wits end over this 2003 bayliner 5.0L merc. here is the symptom: give it some warmpup throttle action, turn key on, she cranks beautifully. no smoke. no roughness. 10-20 seconds later, she instantly cuts off. so.. youre thinking.. it must be a fuel thing, right? i started small: i replaced the fuel filter. same result. a little larger: i replaced the fuel pump (it's an electronic fuel pump, we tested with it unhooked from carb and it was a weak stream.. after replacement she was peein' strong). same result. a little larger: i replaced the ignition coil. same result. a little larger: i rebuilt the carb. at this point, she showed promise. we took her out on the lake for about an hour and she ran beautifully!! i let her sit for a week .. then bam, same damn result as before!! 10-20 second purr then cut off. so i said damn it, let's look at the carb again. no fuel is getting down in the manifold after the initial warmup throttle action!! so figured something is messed up with carb.. went down and bought a fresh rebuilt carb.. last night.. put it on.. same result! and i still don't see fuel dropping into the 2 barrels after crankup. it does make a noise like it's spraying air or something at least. but it was somewhat dark when i was observing it this time... the guy i bought the boat from had done a lot of wiring himself (mp3 player, gps..) .. could it be some electrical shorting after 10-20 seconds or would it only be a startup thing? my next order of business is going at it from the distributor system. maybe the distributor chip is bad? distributor cap? what else could it be!! man this is driving me nuts. that engine is practically new at this point!! also, what do you think about some crap in the fuel? i filled the damn tank up from about 3 gallons.. but what if there is dirt or water or something in the tank and it keeps suckin' up dirt? should i drain the 40 gallon tank.. and clean the tank somehow (never done that.. whats the best way to do it?) give that a shot? the one thing that leads me to believe it isnt the tank is that when i warmup throttle action it pushes fuel down the manifold so the fuel filter seems to be fine? maybe just not fine all the time? any suggestions would be great. i've had it in and out of the shop and they had it fixed at one point but then 1 week later it died again (without me doing anything in between then). i'm tempted to sell the boat, get something else, but i am in it $12K and who is going to buy an '03 bayliner 21.5ft that doesnt run for anywhere near that?? best bet is to get it running, then sell it, i guess, or maybe keep it since ive grown attached : thank you so much for your time reading this, kyle |
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