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Fordanswerman, Ford Motor Company Certified Tech
Category: Ford
Satisfied Customers: 3306
Experience:  Ford Engine Master/Transmission Master/Chassis Master=Ford Senior Master also Diesel 7.3/6.0
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I am getting diesel fuel in crankcase 2003 f250 7 .3,

Customer Question

I am getting diesel fuel in crankcase 2003 f250 7 .3
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: No,starts Same as usual
JA: Are you fixing your F250 yourself? What have you tried so far?
Customer: Nothing is it my fuel injector seals or fuel pump seal !
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 8 months ago.
Category: Ford
Expert:  Fordanswerman replied 8 months ago.

Thanks for the question.

What have you tried or replaced so far for this?


Customer: replied 8 months ago.
Nothing what do u think the problem is
Expert:  Fordanswerman replied 8 months ago.


The most likely cause is either the injector seals on the injectors or worse case the brass inserts where the injectors go into the head could have a crack in one of them.

If it were me, I would replace all 8 injector oring seals first, then change the oil and road test it for about 20 miles and see if this clears up the issue. Of course with each injector removed look at each injector sleeve really close for any signs of cracks.