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-   -   Fuel line sucking air (http://www.sailnet.com/forums/gear-maintenance/45934-fuel-line-sucking-air.html)

kavakava 08-10-2008 08:31 PM

Fuel line sucking air
 
We had a diesel genset installed last year. There's a dedicated pickup from the fuel tank, that goes a few feet to the primary fuel filter, and then another 6-8 feet to the genset. Genset is only a foot above the fuel tank. When the genset is unused for awhile, I have to bleed the fuel line of air bubbles. The dealer can't seem to diagnose the problem. Any suggestions?

sailingdog 08-10-2008 09:21 PM

I bet one of the banjo bolts on the genset was overtightened and has deformed the banjo washer... and when the engine isn't used for a wire the fuel siphons back into the tank, since the tank is lower than the genset, and air comes in via the deformed banjo washer. :)

bubb2 08-10-2008 09:24 PM

thread compound or pipe dope on every joint!!!!!!!!

timebandit 08-12-2008 08:42 AM

I would check everything before the lift pump.

After the lift pump the fuel pressure should be at least 6# and will show a leak.

Rick

Quote:

Originally Posted by kavakava (Post 352520)
We had a diesel genset installed last year. There's a dedicated pickup from the fuel tank, that goes a few feet to the primary fuel filter, and then another 6-8 feet to the genset. Genset is only a foot above the fuel tank. When the genset is unused for awhile, I have to bleed the fuel line of air bubbles. The dealer can't seem to diagnose the problem. Any suggestions?


danielgoldberg 08-12-2008 10:30 AM

You could try a very light check valve right at the tank connection. We had that problem on our Freedom, and for the life of us we never could find a leak. We came to the conclusion that the mechanical lift pump on the genset was not strong enough (not sure if the conclusion was correct, but the solution worked). So, we did two things. One is we installed an electric fuel pump that was wired to the glow plug switch, so when you held the glow plug switch in the pump fired and primed the system. The other is we installed a check valve right at the tank. Our tank was lower than the genset, and the run was about 4 feet from the tank to primary fuel filter, and then another 4 or 5 feet to the genset. As I mentioned, this cured our problem, and we never had a problem starting or running the genset after that. And we never did find a leak.


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