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2nd Gen Non-Engine/Transmission Diesel Fuel Leak - Ideas?

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2nd Gen Non-Engine/Transmission help, broken lugs

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Problem: Fuel Leak. I have a 1998 24 valve Dodge with about 51,000 miles on it. I began to notice a drop of fuel on the floor of the garage after I'd drive the truck. Approximately right between the front wheels and a bit to left of center. I took the truck to my favorite mechanic and he tightened up everything. All fuel lines. Drip stopped; momentarily.



Two weeks later, I was pulling my camper to Odessa, Texas for the CAF AirSho held down there in October. By the time we got to Raton, N. M. we thought we could smell diesel in the cab, and that night when we camped there was a small (about 2-3" diameter) spot under the truck. By the time we reached Lubbock the next day, we were sure we smelled diesel. We camped the next night in Lubbock, I could see a drip on the grass, so I went to the local Dodge dealer, and they said, "you have a loose supply line to the injection pump. " He tightened it up, I washed the truck including underneath it, and everything was fine - no smell - until we started back from Odessa. By the time we got to Amarillo, we could again smell diesel, and there was a spot on the ground again. Reached Raton that night, there was a large spot on the gravel, next morning.



We made it in to Highlands Ranch, the next day, and I again took the truck to my mechanic. I asked if they could again tighten the lines, and maybe use Loc-tite or safety wire on them, to be sure they stayed tight. They used 'Loc-tite' instead (which I've used on the diesel in my boat, with great luck) and again all was fine. Drove to Fort Collins and back (~250 miles), and the drip is again back. James (mechanic) swears lines are tight.



IF anyone has any suggestions on where this is dripping from and how to stop it I'd really appreciate hearing from them? Any suggestion on how to fix this (other than using witch doctors) would be welcome. I'd even consider a witch doctor, come to think of it...



It is driving me crazy and camping season is about upon us again.





Bill Bates, CPP

Retired and LOVING it
 
Call around to shops until you find one that has an ultraviolet lite & die kit , they put a small bottle on fuel dye in the tank & then even with a wet area , your can see the fuel with the dye - shown by the the ultraviolet lite .
Or the old fashion way pressure wash & a bright lite , sometimes a mirror will help .
 
Any recent fuel filter servicing before this started? I'd be looking around that area and around the lift pump.

Chuck
 
Bill,

I hate to say this, but it could be your lift pump. Mine is leaking right at the 12volt plug. It took me a little while to figure it out, because it would go all over.

Big A
 
You can take the lift pump off and the same bolts that provide for mounting on the plate on the side of the engine also hold down a flat plate on top of the pump that can be removed to clean out the veins in the pump. That plate might be loose. It's the only thing that comes apart on the original design pumps. If I were going to take it off the motor I'd just be replacing it but that's me. If it's not leaking there I'd be looking at the fuel filter. Usually leaks thru the seal that sit's in a groove around the top of the filter canister.

Leaks suck...

Chuck
 
I had a similar issue with a fuel leak... it was coming out the back of the electrical plug in my lift pump. After I called Cummins for a new lift pump and replaced it, no more leak.
 
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