Diesel leak

Robbiepha

New member
I have a diesel leak in some kind of an overflow hose behind the engine near the trans... Can't figure out where the leak could be coming from. The sprinter runs well with no issues... Any ideas??
 

Aqua Puttana

Poly - Thread Finder

MillionMileSprinter

Formerly Type2Teach
If it's an '02-'06, the tube comes from the injector wells. Looks like you have a leaky injector, injector line or injector fuel return hose. If you take the black cover off of the head, you will probably see where the leak is coming from.
 

Robbiepha

New member
If it's an '02-'06, the tube comes from the injector wells. Looks like you have a leaky injector, injector line or injector fuel return hose. If you take the black cover off of the head, you will probably see where the leak is coming from.
I removed the cover, couldn't really tell where the leak was coming from but one of the wells was full of diesel...I will test and see if I have a bad injector... Thank you!!
 

Aqua Puttana

Poly - Thread Finder
I removed the cover, couldn't really tell where the leak was coming from but one of the wells was full of diesel...I will test and see if I have a bad injector... Thank you!!
It is not likely to be an injector proper. That is a fairly unusual failure.

Closely inspect the black tubing and fittings of the return system. If you mess with any of the black plastic fittings on the top of the injectors be very careful. Those fittings are often a bit fragile. They are sold as an assembly. Another place to inspect is the steel fittings. If you tighten any of those use two wrenches for backup so you don't loosen the threaded fitting.

If the leak seems illusive some people have used paper towel or cloth strips wrapped around the various fittings. The leak should wet the material.

Good hunting. vic
 

Robbiepha

New member
It looks more like the leak is from the steel fittings..I removed them and then tightened them back...one of them still look wet..why would they be leaking...
 

Aqua Puttana

Poly - Thread Finder
..why would they be leaking...
:idunno:

Failed component?

A marginally tightened fitting which eventually loosens up?

The injector gets a high frequency trigger signal that can cause vibrations, not to mention general vibrations of an operating engine.

vic
 

MillionMileSprinter

Formerly Type2Teach
It is most likely a cracked T fitting. I had one just randomly crack on me a few weeks ago. Here's a photo of what a cracked/brokn one looks like next to a good one. I had to dig the o ring and broken tip out of the top of the injector with a dental pic.
 

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MillionMileSprinter

Formerly Type2Teach
...or it could be a loose connection at the fuel line. Just read your response.
 

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