Fuel leak from injectors?

[Pstyckiewicz]

So I developed a fuel leak somewhere on the driver side. It is leaking down the engine onto the oil filter and exhaust pipe from what i think is the injector(s). A couple of the injector look damp around them but it’s tuff to tell due to the slow oil leak it has in the same area. This leak developed after sitting for 2 weeks and it’s been cold out.
I did a quick look and can’t see anything leaking from the fuel filter or hoses to it. The only area that I think it could be is the injectors. I don’t see any steady drips or leaks when I have it on either. Just a decent oil Stan on the drive way and fuel cover side of engine.
Any thoughts or suggestions?

 

[Mogman]

Possibly return lines, each injector has a small hose , two actually except for one on each side have a cap and they do rot out.

 

[Pstyckiewicz]

Would they leak while it’s just sitting? And I was kinda hoping something would jump right out when I turned it on but can’t see anything leaking.

 

[Barrman]

Those return hose leaks are sneaky. Often I will get a smell of diesel when walking by the truck when it is not running. Then I can look and often do not see any liquid. Starting the engine sometimes will maybe or maybe not show the spot as you have found out. A good flashlight with the engine running has been my best way of finding the culprit.

 

[Pstyckiewicz]

I’ll give it a good look with a flash light

 

[Retiredwarhorses]

Look into the valley of the engine, the leak may be the injection pump and the fuel is leaking out of the valley drain, it exits just above the oil filter.
you don’t have your vehicle model and year listed so it’s just a guess, it’s also possible the drain back lines are leaking on the injectors, injectors rarely leak, if they do? The motor would not run well.

 

[Pstyckiewicz]

2007 M1152A1
I pulled the dog house off and looks like the leak is dripping onto the transmission. Ran out of time to pull the shield off the turbo and my heat insulation off. Is there a return hose back there?

 

[BLK HMMWV]

I'm with Steve on this. Check valley drain.
Might be leaking from bottom of IP into valley.

 

[Mogman]

You should be able to see in the valley by looking beside/behind the IP

 

[frauhansen]

Would they leak while it’s just sitting? And I was kinda hoping something would jump right out when I turned it on but can’t see anything leaking.

jep... they do. but not for long. mustly the 10min after turnung of the truck.

 

[Pstyckiewicz]

I looked in the valley and nothing stands out. Just the normal looking oily sludge in the middle.

I did notice that my exhaust gasket is gone between the flex pipe thing and the pipe to the exhaust.

 

[Barrman]

The “Normal oily sludge in the middle” is not normal. The valley should be dry. I don’t have a center mount turbo so I will let others comment.

 

[Pstyckiewicz]

I think the sludge is more or less dirt and just liquids from stuff I have changed out over time.

 

[Pstyckiewicz]

Bock to the gasket thing. I believe there is no gasket between the turbo and exhaust pipe? I just loosened it and moved it back to being aligned and tightened it down. It must have moved when I changed out my flex plate.

 

[Mogman]

Bock to the gasket thing. I believe there is no gasket between the turbo and exhaust pipe? I just loosened it and moved it back to being aligned and tightened it down. It must have moved when I changed out my flex plate.

No it is just a "flair" fitting (I am sure the exhaust folks have a different name for it)

 

[BLK HMMWV]

Look at the bottom of the front of the IP.
Does the bottom of it look like it may have sat in water . My IP leaked from the small mechanical pump under the front bottom of the IP. When the valley drain gets plugged the valley fills up with water if your truck sat out in the elements before you got it.
When I had my IP rebuilt they said that was a common problem because the piston in the pump was steel or the sleeve of the wall was aluminum or visa versa.
It was years ago. Might have to use a mirror to see up in there.

 

[Pstyckiewicz]

Did some more looking. There is about an inch of dirt on the bottom in the valley. Cleared the dirt away from the plunger thing on the passenger side and let it run. No leaks from there.