STD Tuning Engine Fuel leak sources

Fuel leak sources

Fuel leak sources

 
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EmJay
Holset

299
11-29-2015, 11:10 AM #1
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.

1987 Mazda B2200 "outlaw" **planning phase**  Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans Smile
1985 Mercedes 300D stock for now
EmJay
11-29-2015, 11:10 AM #1

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.


1987 Mazda B2200 "outlaw" **planning phase**  Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans Smile
1985 Mercedes 300D stock for now

Volker407
naturally aspirated

157
11-29-2015, 02:06 PM #2
Other than what you have mentioned already the hand primer pump is highly suspicious for leaks

Gruß
Volker
Volker407
11-29-2015, 02:06 PM #2

Other than what you have mentioned already the hand primer pump is highly suspicious for leaks

Gruß
Volker

EmJay
Holset

299
11-29-2015, 05:00 PM #3
Is there a gasket on the pump that can be suspect?

1987 Mazda B2200 "outlaw" **planning phase**  Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans Smile
1985 Mercedes 300D stock for now
EmJay
11-29-2015, 05:00 PM #3

Is there a gasket on the pump that can be suspect?


1987 Mazda B2200 "outlaw" **planning phase**  Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans Smile
1985 Mercedes 300D stock for now

Petar
7.5mm M pump

459
11-29-2015, 05:13 PM #4
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.
Petar
11-29-2015, 05:13 PM #4

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.

mcwfxx
K26-2

37
11-29-2015, 05:21 PM #5
(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.

---
W639 Vito OM606 + 722.6 STD - in progress

Current progress: engine in, gearbox in, bumper bar modified to accept w210 radiator, audi electric fan, very tight squeeze, interior stripped out ready for new seats (w211) and custom dash with w211 clocks controlled by arduino with split fuel gauge covering main tank and auxiliary for Veg Oil ...

- DSL1 ECU for Electronic OM606 Pump (currently fitting wiring)
Next; 722.6 Controller, HX40 with homemade manifold, Air-to-water intercooler, homemade exhaust, MOT.... One day!



mcwfxx
11-29-2015, 05:21 PM #5

(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.


---
W639 Vito OM606 + 722.6 STD - in progress

Current progress: engine in, gearbox in, bumper bar modified to accept w210 radiator, audi electric fan, very tight squeeze, interior stripped out ready for new seats (w211) and custom dash with w211 clocks controlled by arduino with split fuel gauge covering main tank and auxiliary for Veg Oil ...

- DSL1 ECU for Electronic OM606 Pump (currently fitting wiring)
Next; 722.6 Controller, HX40 with homemade manifold, Air-to-water intercooler, homemade exhaust, MOT.... One day!



EmJay
Holset

299
11-29-2015, 07:12 PM #6
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!

1987 Mazda B2200 "outlaw" **planning phase**  Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans Smile
1985 Mercedes 300D stock for now
EmJay
11-29-2015, 07:12 PM #6

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!


1987 Mazda B2200 "outlaw" **planning phase**  Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans Smile
1985 Mercedes 300D stock for now

MFSuper90
Budget Builder

1,533
11-29-2015, 11:27 PM #7
It truly is as simple as it looks! Most times you can visually spot clean spots on the engine where the fuel is leaking

'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler Big Grin
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted         
MFSuper90
11-29-2015, 11:27 PM #7

It truly is as simple as it looks! Most times you can visually spot clean spots on the engine where the fuel is leaking


'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler Big Grin
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted         

pryantcc
TA 0301

63
12-01-2015, 06:22 AM #8
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

1992 W201 190D 2.0L and 1971 W108 280SE with OM606, electronic pump and 6 speed manual gearbox.
pryantcc
12-01-2015, 06:22 AM #8

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


1992 W201 190D 2.0L and 1971 W108 280SE with OM606, electronic pump and 6 speed manual gearbox.

EmJay
Holset

299
12-19-2015, 09:12 PM #9
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!

1987 Mazda B2200 "outlaw" **planning phase**  Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans Smile
1985 Mercedes 300D stock for now
EmJay
12-19-2015, 09:12 PM #9

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!


1987 Mazda B2200 "outlaw" **planning phase**  Chevy 283, Power Pack heads, Edelbrock carb and intake, turbo 350 trans Smile
1985 Mercedes 300D stock for now

 
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