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Fuel leak, not sure from what?


breister

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I have a 2002 Monaco Windsor with a 350hp cummins 8.3l engine. When I first start it up there is a slow drip of fuel for a couple minutes under the engine area. After a small puddle about the size of a softball is created it stops. When I climb under the unit, I can see it is coming from a pump or something next to the oil pan on the curb side. The part is made by Delco Remy and has a serial # on it but I don't know what this is? Is it a fuel pump maybe? The leak seems to come from a gasket between this part and what it is connected too. Any ideas what this is and why it quits after a couple minutes? Thanks much

 

Brian

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The lift pump is the likely culprit. As I understand it, it's primary job is to get fuel flowing to get the engine running, then it lets the fuel pump take over. As mentioned above, some have found tightening the bolts stops the leak. But the use of ULSD fuel in a system that formerly ran the older diesel mix will shrink the seals and cause a leak eventually. Many of us have had to replace the lift pump for that reason.

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Look above the starter, good chance the source is as mentioned - the Lift Pump:)! The trickle down effect, could make it look like the starter.

 

That being said, are you sure it is diesel fuel that is leaking? Could it b coolant? We had two compression nuts loosen over the years, and it was enough for a few drops of coolant to leak. PITA to reach on our ISL, but just resounding them back up, was enough to stop the leak. And, I'll tell you my first thought due to location of the leak, was that it was sourced from the Lift Pump.

 

If it is the Leak Pump, you might want to consider replacing it with an aftermarket fuel pump. We did preemptive maintenance on ours, and bypassed the Lift Pump, and installed the FASS Fuel Pump (Just the pump, not the duel filters too. As our Country Coach came with good filtration systems in place.). These CAPS era ISC's and ISL's depend upon fuel flowing to the Injector Pump to do both lubrication and cooling. While Lift pumps are not cheap, they are when compared to ruined Injector Pump:)! I personally run an additive lubrication to each tank, as these engines were designed for pre USLD Type 2 fuels. Many will say it's not needed, but I consider it cheap insurance.

 

On the items designed for pre USLD, any rubber fuel lines, say to the generator, or if you have it the Hydro/Aqua Hot, do not play well with the ULSD's. They eat away the fuel line, and leakage is very possible. Fires have resulted from leaking diesel running onto a hot exhaust of a generator. Good item to check into on any coach designed in that era, and add to your preventative maintenance. We've replaced both our generator and Hydro Hot fuel lines.

 

Best of luck to you, and please close the loop back and let us know what you find out!

Smitty

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So assuming it is the life pump that's leaking and it's located above the starter, how in the world do I get up there to repair/replace it? Do I need to remove the starter to get up there? It looks like that may be the case. Doesn't seem like a fun or easy job? Thanks again for any input/suggestions.

 

Brian

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