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backfires, no power under load, merc 350s
I just took my boat out of storage after 3 years. It had been
properly winterized and laid up. To ready it for use, I paid a mechanic to replace plugs, distributor caps, drain fuel tank, replace filters, change all oils, and re-tune engines. I took the boat out and ran it only to discover it would not go over about 1300 rpm on either engine (sterndrives - Bravo IIIs) and it backfires badly. The engines start and idle fine. I noticed there was still fuel in the tank, almost a quarter tank according to the gauge. From memory that could be 40 or more gallons remaining in a 160 gallon tank. I put in 60 gallons of fresh premium and then put in another four bottles of 104 octane boost. The problem did not improve at all. Any ideas? I am taking the boat back to the mechanic, but I no longer trust him since he delivered the boat back to me in its current condition. Thanks. |
backfires, no power under load, merc 350s
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backfires, no power under load, merc 350s
Empty the fuel filters into clear glass jars. Look for clarity, lack of
suspended contaminants,or water at the bottom, It should not smell like varnish. It should have a strong gasoline odor. Verify that the plug wires are on correctly and the base timing is correct. If you have had wet weather recently, pull the caps and make sure they are dry. Lastly, you may need to rebuild or replace the carburetors. Jim wrote in message oups.com... I just took my boat out of storage after 3 years. It had been properly winterized and laid up. To ready it for use, I paid a mechanic to replace plugs, distributor caps, drain fuel tank, replace filters, change all oils, and re-tune engines. I took the boat out and ran it only to discover it would not go over about 1300 rpm on either engine (sterndrives - Bravo IIIs) and it backfires badly. The engines start and idle fine. I noticed there was still fuel in the tank, almost a quarter tank according to the gauge. From memory that could be 40 or more gallons remaining in a 160 gallon tank. I put in 60 gallons of fresh premium and then put in another four bottles of 104 octane boost. The problem did not improve at all. Any ideas? I am taking the boat back to the mechanic, but I no longer trust him since he delivered the boat back to me in its current condition. Thanks. |
backfires, no power under load, merc 350s
I agree. Fuel is the most likely culprit. There just is no good way to
store a gas engine 3 years. One thing is for sure after three years it can gum up just about the whole thing. "JR North" wrote in message .. . From your description, the power loss and backfire is a lean-out condition, and not ignition related. If the engines idle fine, the wires are on correctly and since the plugs, caps, etc. are new, no crossfire in the distributors likely. More likely: fuel related; clogged jets in the carbs, bad fuel pumps from sitting so long, clogged water separators or filters (including the screen in the carb inlet). Really bad fuel, although more likely a delivery/metering issue. Unless your mechanic actually had the boat out on a run after servicing, don't blame him. Take it back and let him resolve the problem. These problems are the result of letting it sit so long. JR wrote: I just took my boat out of storage after 3 years. It had been properly winterized and laid up. To ready it for use, I paid a mechanic to replace plugs, distributor caps, drain fuel tank, replace filters, change all oils, and re-tune engines. I took the boat out and ran it only to discover it would not go over about 1300 rpm on either engine (sterndrives - Bravo IIIs) and it backfires badly. The engines start and idle fine. I noticed there was still fuel in the tank, almost a quarter tank according to the gauge. From memory that could be 40 or more gallons remaining in a 160 gallon tank. I put in 60 gallons of fresh premium and then put in another four bottles of 104 octane boost. The problem did not improve at all. Any ideas? I am taking the boat back to the mechanic, but I no longer trust him since he delivered the boat back to me in its current condition. Thanks. -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth |
backfires, no power under load, merc 350s
On May 21, 8:06 am, "jamesgangnc" wrote:
I agree. Fuel is the most likely culprit. There just is no good way to store a gas engine 3 years. One thing is for sure after three years it can gum up just about the whole thing. "JR North" wrote in message .. . From your description, the power loss and backfire is a lean-out condition, and not ignition related. If the engines idle fine, the wires are on correctly and since the plugs, caps, etc. are new, no crossfire in the distributors likely. More likely: fuel related; clogged jets in the carbs, bad fuel pumps from sitting so long, clogged water separators or filters (including the screen in the carb inlet). Really bad fuel, although more likely a delivery/metering issue. Unless your mechanic actually had the boat out on a run after servicing, don't blame him. Take it back and let him resolve the problem. These problems are the result of letting it sit so long. JR wrote: I just took my boat out of storage after 3 years. It had been properly winterized and laid up. To ready it for use, I paid a mechanic to replace plugs, distributor caps, drain fuel tank, replace filters, change all oils, and re-tune engines. I took the boat out and ran it only to discover it would not go over about 1300 rpm on either engine (sterndrives - Bravo IIIs) and it backfires badly. The engines start and idle fine. I noticed there was still fuel in the tank, almost a quarter tank according to the gauge. From memory that could be 40 or more gallons remaining in a 160 gallon tank. I put in 60 gallons of fresh premium and then put in another four bottles of 104 octane boost. The problem did not improve at all. Any ideas? I am taking the boat back to the mechanic, but I no longer trust him since he delivered the boat back to me in its current condition. Thanks. -- -------------------------------------------------------------- Home Page:http://www.seanet.com/~jasonrnorth My concern is that the mechanic has already overcharged me for the work. I paid him to empty the fuel tank and he left at least a quarter tank in it. So now he has an excuse to charge me for new fuel pumps I may not need to hide his cost to re-drain and re-fill the tank. How can I prevent this other than to take the boat to a different mechanic? Thanks for your ideas! |
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