6.5 turbo diesel

[hi-trail]

We have recently discovered that we are getting diesel fuel in our oil. In the past 2 weeks we have changed the oil once and also a second time dumped most of the oil and added fresh oil but I noticed this morning that I have to do it again. I am not too familiar with these motors and hope that someone has an answer for me. I have talked to a couple of people and they told me what it might be but I thought I would ask people with more experience. Ken

[rjschoolcraft]

What year and size vehicle and what engine code? That will help us to answer your problem.

[hi-trail]

Thankyou for answering so quickly. It is a 1994
Chev Silverado 1 ton Dually diesel, the engine code is F, it also has 350 k's on it.

[More Power]

A bad seal in the front of the fuel injection pump can allow diesel fuel to contaminate the engine oil.

MP

[mklein]

A failing lift pump can also allow fuel to leak directly into the crankcase.

[ejdiesel]

Originally posted by mklein:
A failing lift pump can also allow fuel to leak directly into the crankcase.

[ejdiesel]

your oil /fuel contamination will be in the injection pump. 6.5 t non electric ??
this was a common failure through out the earlier years

[rjschoolcraft]

Originally posted by mklein:
A failing lift pump can also allow fuel to leak directly into the crankcase. Not on a 94 6.5. These use an electric lift pump mounted on the left side frame rail.