Fuel Leak

[flhtc01]

Ok, so I noticed today that there was a spot under my 1986 CUCV in front of the front axle. It was definitely fuel and not oil. Any guess as to where this is coming from? The fuel is dripping off of the cross member and the hose for the breather to the front axle. How does the fuel get from the lift pump to the injection pump? Is it hard plumbed or rubber hose? Looking for suggestions on where to start looking. Might increase my fuel mileage if I get the leak stopped.

 

[ak diesel driver]

I'd check out the return lines on the front of the engine

 

[just a number]

could also be the supply line that runs from the mechanical lift pump. IIRC it ran up the front of the block and the under the intake.

 

[flhtc01]

I had a chance to go out and look somewhat closer. The top of the engine is dry but, it would appear to be coming from the lower end as it is only wet looking down on the cross member and the vent hose out of the front axle. I think it may be the mechanical lift pump or the supply line rubber hose. I think I am going to replace the lift pump and hose as I have one here.
Along the same lines, I want to replace the rubber hose going into the IP with a clear line. The problem is that I do not know which one I should replace. Is it the one going in from the front of the engine right into the middle? If so, does anyone know the size of that line?

 

[ak diesel driver]

you need to install it on the fan side of the IP. it will be 1/4"

 

[flhtc01]

Ok, so it comes out of the IP and makes a 90 degree bend down to the hard line. About 6" in total length. Right?

 

[ak diesel driver]

yep

 

[flhtc01]

Thanks. I appreciate the information.

 

[ak diesel driver]

FYI that is the return side of the IP

 

[flhtc01]

Well, that is where I should install the clear hose. Correct?

 

[ak diesel driver]

yes

 

[flhtc01]

Thanks.

 

[flhtc01]

Lift pump was leaking. Replaced and now no more fuel leaking. Hydro-Booster is the next leaking problem.