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+--- Thread: Fuel leak sources (/showthread.php?tid=6898)
Fuel leak sources - EmJay - 11-29-2015
Got a quick q for you guys. After a nice long drive in my 85, I smell diesel fumes around the hood of my car. Aside from the fuel lines and filters, are there any other potential sources for a fuel leak? Like a gasket on the pump or something? I know that I need new fuel return lines, and an planning on getting Greazzer's rebuilt injectors sometime after tax returns.
RE: Fuel leak sources - Volker407 - 11-29-2015
Other than what you have mentioned already the hand primer pump is highly suspicious for leaks
Gruß
Volker
RE: Fuel leak sources - EmJay - 11-29-2015
Is there a gasket on the pump that can be suspect?
RE: Fuel leak sources - Petar - 11-29-2015
No, you have to replace the primer pump. It is screwed into the lift pump and sealed to it by a copper washer. Newer style black plastic primers are much better. Btw they are quite inexpensive, less than 10 dollars.
My guess is just the injector return lines are leaking. Extremely common problem.
RE: Fuel leak sources - mcwfxx - 11-29-2015
(11-29-2015, 05:13 PM)Petar No, you have to replace the primer pump. It is screwed into the lift pump and sealed to it by a copper washer. Newer style black plastic primers are much better. Btw they are quite inexpensive, less than 10 dollars.
My guess is just the injector return lines are leaking. Extremely common problem.
Seen leakoff pipes go porous, and seen rubber hoses go porous (but that was on cdi engines with lift pump and quite a bit of positive pressure). On some of the cdi's it wouldnt show visually, just the smell as hot diesel (usually near the high pressure pump) made it smell in the cabin.
Definitely worth checking leakoff pipes. sniff test, or rub and sniff fingers might be necessary if there isnt an actual leak.
RE: Fuel leak sources - EmJay - 11-29-2015
Hmm, to be honest I never noticed the primer pump on my lift pump, never needed to. So my first project will be to replace the return lines, then the primer pump on the lift pump. Sounds simple enough. Thanks guys!
RE: Fuel leak sources - MFSuper90 - 11-29-2015
It truly is as simple as it looks! Most times you can visually spot clean spots on the engine where the fuel is leaking
RE: Fuel leak sources - pryantcc - 12-01-2015
I had problems with the seals where the injector lines exit the top of the pump. It became quite a significant before I got around to replacing the sealing rings:
https://www.youtube.com/watch?v=PlB0Uc1qdUk
RE: Fuel leak sources - EmJay - 12-19-2015
Just an update, replaced the return lines on the injectors (the tiny PIA ones) and the smell was greatly reduced. Still see a small amount of diesel resting on the #2 injector, will monitor for now. Mileage went up a bit as well, so yay!