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6V92 Shuts Down Barbara 11-10-03  
When I let my bus sit for 5 or more days.

Engine will start up okay, but after about
10 min, engine will slowly start shutting down.

Pull plug from top of primary filter and no fuel in top of filter. You can prime system and start up ang no problems.

We have removed return line in tank and checked for air bubbles and flow rate.

The flow rate is good. Checked feed line to filter and check valve is holding fuel in line at filter.

Any help?
Re: 6V92 Shuts Down Mark O. 11-20-03  
It sounds to me as if you have a leak in one of your fuel lines.

It most likely isn't big enough to leak more than a sweat but is big enough to allow the fuel to drain back to the tank via the return line.

The reason why it only occurs after it has been sitting for a while is the while the engine is running the fuel will tend to swell the rubber thereby closing the leak. As soon as the engine has stopped running and the fuel is no longer pressurized the rubber will start to dry out and cause your leak to reappear.

Understand the leak may only be a very small pinhole. A small pinhole is enough to cause you to lose your prime.

The most likely places to find the leak would be at a joint or where the fuel line rubs up against something.

Good luck.

Mark O.
Re: 6V92 Shuts Down Dallas Farnworth 11-23-03  
It also sounds as if the check valve(s) in the fuel line may be leaking back to the tank which causes a siphoning action.
Do a fuel line back pressure test and see if you hear bubbles in the fuel tank.
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