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#1
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
My slip neighbor arrived in his 41 foot sailboat and said he would have been
there earlier but he had a bitch of a time getting his engine (diesel) going. I asked what he does for winterization and he said he drains all the fuel and puts in new filters. He spent a good part of a day bleeding and trying to get the fuel system primed. I just change the oil, run anti-freeze through the raw water system, and shut down. Two years in a row, the engine has lit off in the spring just as quickly as if it were all warmed up in the middle of a short summer daysail. The fuel system was full of jelly when the boat arrived two years ago after a six year layup with fuel in it. I had everything cleaned out and the fuel tank polished. The settlement bowl on the primary filter is crystal clear (well, ruby red) and I've put only 70 - 100 gallons in the 15 gallon tank. Since that would be just a couple days running on a power boat, I don't see anything to be gained by a filter change at this point. My neighbor's experience seems to bear this out. I'm thinking that filter changes, in the absence of picking up some problem fuel, should be a function of the total amount of fuel that flows through the filter and not an automatic once a year thing. I'd like to know what experience other sailboat owners have had, recognizing that hotter climates and fuel from funkier places than Portland, Maine might dictate more frequent changes. -- Roger Long |
#2
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
* Roger Long wrote, On 6/1/2007 7:52 PM:
.... I'm thinking that filter changes, in the absence of picking up some problem fuel, should be a function of the total amount of fuel that flows through the filter and not an automatic once a year thing. I'd like to know what experience other sailboat owners have had, recognizing that hotter climates and fuel from funkier places than Portland, Maine might dictate more frequent changes. I have to agree - I've seen more problems from changing fuel filters than from not changing. I do have Racors in addition to the normal Yanmar filters, so there's little reason to have dirty fuel, and the clear bowl lets me see any water or crud, though I don't remember seeing any in years. Bleeding shouldn't be an all day task in any case. Last year my system was drained because I put in a new fuel tank; priming both engines might have taken 40 minutes. If you friend really wants to drain the system, and then has a problem bleeding, he should have an electric pump to facilitate. |
#3
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
"Roger Long" wrote in
: 'm thinking that filter changes, in the absence of picking up some problem fuel, should be a function of the total amount of fuel that flows through the filter and not an automatic once a year thing. You've failed to mention the MOST important function in good fuel management.....refilling the tanks. Didja ever notice what all the light plane pilots do, religiously, when they return to the airport, but before putting the plane in the hangar? They visit the fuel dock and REFUEL....even if it only takes 3 gallons. Why?? A fuel tank not full to the filler neck "breathes". At night, when it cools, it breathes in that water-soaked evening air that wets everything with dew...including the inside walls of a half-empty fuel tank. As the condensation continues in the night, the water forms into droplets too heavy to stick to the tank and slide down the walls. As the water is heavier than the fuel, gas or diesel, it slides down UNDER the fuel, making a layer of water that increases every daily cycle....well, until either the black algae that grows in the dark in the layer between the fuel (food) and the water (water)...gets sucked up to clog the fuel filters or injection system. When the sun rises, the half-empty fuel tank on every sailboat in your marina pressurizes and blows out the air inside it so that it can suck in that next load of wet night air, tomorrow night. Gas powered boats do even better! They blow out the light aromatic elements in gasoline that give gas its octane rating....eventually turning the light gas into heavy shellac...that brown lookin' "bad gas" everyone tells you about. And all you have to do to stop it dead in its tracks is to take the time to stop at the damned fuel dock and top off the tanks before heading to your slip......even if it only takes a gallon. Full fuel tanks NEVER have "water in them".....in the hangar at the airport. Larry -- If electricity comes from electrons, does morality come from morons? |
#4
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
Roger Long wrote:
I'm thinking that filter changes, in the absence of picking up some problem fuel, should be a function of the total amount of fuel that flows through the filter and not an automatic once a year thing. I'd like to know what experience other sailboat owners have had, recognizing that hotter climates and fuel from funkier places than Portland, Maine might dictate more frequent changes. Close, but no cigar, Roger. It's not the passage of time or the volume of fuel that passes through the filter, but the amount of clogging the filter experiences as it does its job and filters out whatever is in the fuel. Not always evident from a visual peek at the filter. The technically correct strategy is to place a simple, cheap (~$10) vacuum gage in the fuel line. The more clogged the filter, the greater the vacuum created as the pump tries to move fuel through the filter. The gage will tell you when its time to change the filter(s) (well, if you have multiple filters, it won't tell you which one(s) unless you use multiple gages, which is a move away from KISS). So just assume if the gage says clogged, you should change them all. How often do we want to smell up the boat, anyway? Here's an example from the automotive diesel field: http://www.thedieselpage.com/reviews/jkfuelpressure.htm TheDieselPage.com - Kennedy Diesel Fuel Pressure Gauge - Product Review And here's a BoatUS link: http://www.boatus.com/boattech/casey/33.htm Fuel System Maintenance by Don Casey All toward having clean fun! Chuck ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#5
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
Larry wrote:
Didja ever notice what all the light plane pilots do, religiously, when they return to the airport, but before putting the plane in the hangar? They visit the fuel dock and REFUEL....even if it only takes 3 gallons. Why?? I agree with you about boats sitting there in the water. However, during my previous life as an aircraft maintenance officer I concluded, along with a lot of other people, that filling aircraft fuel tanks wasn't necessary. We draw fuel out of the sumps before every flight and I never saw water after instituting a policy on not filling unless the taniks were below 3/4. There are some aircraft fuel tanks, the ones with the rubber bladders that insulate, and the "wet wings" where the situation may be different. Never saw a problem though with the 172 with aluminum tanks inside aluminum wings. I wouldn't refill my boat tanks after every trip because of this issue but agree that it is vital for a long down time or winter layup. -- Roger Long |
#6
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
Chuck wrote:
Roger Long wrote: The technically correct strategy is to place a simple, cheap (~$10) vacuum gage in the fuel line. Agreed. A gauge has been on my list of upgrades but I'm going to wait until the first filter replacement to do it when the fuel system is opened up anyway. I figure next winter is about time to do this. Incidentally, I have an electric fuel pump. When I accidentally bumped the fuel shut off, I learned that it makes a racket when pumping hard. Listening to it on every start up should also be a clue to developing filter problems. -- Roger Long |
#7
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
On Jun 1, 6:52 pm, "Roger Long" wrote:
I'm thinking that filter changes, in the absence of picking up some problem fuel, should be a function of the total amount of fuel that flows through the filter and not an automatic once a year thing. I'd like to know what experience other sailboat owners have had, recognizing that hotter climates and fuel from funkier places than Portland, Maine might dictate more frequent changes. -- Roger Long I think you are right Roger, except some filters degrade over a long time just sitting in fuel, but your slip neighbor claimed he drained the fuel system. I have an inline vacuum gauge that tells me when to change the filter. Joe |
#8
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
Not so !!!!!!!!!!!!
The filter media of fuel filters is a mixture of cellulosic fibers and a 'wet-strength' resin. Although the 'aim' of the technical resinated paper manufacturer is to have the resin coat all the fiber surface inevitably there will be some fiber sites that are not resinated. Here comes the 'important' part: Cellulose decomposes in the presence of water over the long term ... think of how toilet paper (a cellulosic papear) falls apart a short time after 'wetting'. Sooooooooo, if you are using the typical resinated papaer filter elements (Racor, etc.) AND you have noticed free water in the sump of your filter .... then increase your normal changeout schedule OR keep a record of the differential operating pressure of the filter at near engine wide-open-throttle (WOT) ---- as a filter that is 'breaking through or has cellulose that is now softening/digesting will show a REDUCED pressure differential as previous under you 'reference' engine rpm. Secondly, such filters are pleated, the diaphragm pump is a 'pulse type' pump and the pleates in the filter 'flex'. Under long term flexing of the pleats, the media will break and the filter will 'unload' its retentate down stream ..... ; thus, keep an eye on the pressure gages and change out frequently if you notice a non-linear increase in differential pressure in the filter immediately down stream. Simple recommendation ... if you use the engine a lot consider changing every 100 or so hours of operation with respect to pleat breakage by flexure; or, keep a damn good eye on the filter gages. :-) I'm thinking that filter changes, in the absence of picking up some problem fuel, should be a function of the total amount of fuel that flows through the filter and not an automatic once a year thing. I'd like to know what experience other sailboat owners have had, recognizing that hotter climates and fuel from funkier places than Portland, Maine might dictate more frequent changes. -- Roger Long |
#9
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
Sorry but thats entirely WRONG.....
Fuel picks up or absorbs water because its DRY when its made; the heat of distallation/cracking drives all the water out of the hydrocarbon mix. IN a tank thats vented to atmosphere, chemical equilibrium will drive water vapor INTO the fuel through the vent until the fuel is fully saturated with water. The tank does not 'breathe', the oil does not 'breathe', etc. Water vapor keeps on absorbing INTO the fuel until its saturated to an equilibirum condition of saturation. If you have water condensation on the walls of the tank it means that the oil is already fully or nearly saturated with water vapor. Has NOTHING to do if the tand is full, 1/2 full, etc. Empty tanks do not gain water .... ask yourself why? The ONLY way to keep water out of a fuel tank that is vented to atmosphere is put a water adsorbing desiccant breather filter on the vent line .... or if the the tank is rated for full vacuum (no boat or aircraft tanks ever are) simply CLOSE the VENT line VALVE when not operating. :-) In article , Larry wrote: "Roger Long" wrote in : 'm thinking that filter changes, in the absence of picking up some problem fuel, should be a function of the total amount of fuel that flows through the filter and not an automatic once a year thing. You've failed to mention the MOST important function in good fuel management.....refilling the tanks. Didja ever notice what all the light plane pilots do, religiously, when they return to the airport, but before putting the plane in the hangar? They visit the fuel dock and REFUEL....even if it only takes 3 gallons. Why?? A fuel tank not full to the filler neck "breathes". At night, when it cools, it breathes in that water-soaked evening air that wets everything with dew...including the inside walls of a half-empty fuel tank. As the condensation continues in the night, the water forms into droplets too heavy to stick to the tank and slide down the walls. As the water is heavier than the fuel, gas or diesel, it slides down UNDER the fuel, making a layer of water that increases every daily cycle....well, until either the black algae that grows in the dark in the layer between the fuel (food) and the water (water)...gets sucked up to clog the fuel filters or injection system. When the sun rises, the half-empty fuel tank on every sailboat in your marina pressurizes and blows out the air inside it so that it can suck in that next load of wet night air, tomorrow night. Gas powered boats do even better! They blow out the light aromatic elements in gasoline that give gas its octane rating....eventually turning the light gas into heavy shellac...that brown lookin' "bad gas" everyone tells you about. And all you have to do to stop it dead in its tracks is to take the time to stop at the damned fuel dock and top off the tanks before heading to your slip......even if it only takes a gallon. Full fuel tanks NEVER have "water in them".....in the hangar at the airport. Larry |
#10
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
Rich Hampel wrote in news:030620071736213514%RhmpL33
@nospam.net: the media will break and the filter will 'unload' its retentate down stream . Sounds expensive!....(c; Larry -- If electricity comes from electrons, does morality come from morons? |
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