Fuel in engine oil
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Fuel in engine oil
I have a 94 7.3idi turbo with 242,000 mi. I am getting diesel fuel in the engine oil. I replace the fuel pump and the injector pump sr
till getting fuel in oil. Don't know what else. It could be. Runs fine and idles smooth.
till getting fuel in oil. Don't know what else. It could be. Runs fine and idles smooth.
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I have the mechanical pump in side of block. That has been replaced also
Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
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From: Northwest
Basic questions.
How do you know it is diesel fuel?
Are you seeing the oil level rise on the dipstick? How long does it take you to notice more oil in crankcase?
Hobo
How do you know it is diesel fuel?
Are you seeing the oil level rise on the dipstick? How long does it take you to notice more oil in crankcase?
Hobo
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Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
Likes: 219
From: Northwest
Basic questions?
How do you know it is diesel fuel in the engine oil? Analysis ?
Are you seeing the oil level rise on the dip stick? How much rise and how often?
Hobo
How do you know it is diesel fuel in the engine oil? Analysis ?
Are you seeing the oil level rise on the dip stick? How much rise and how often?
Hobo
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Scope Wizard
Joined: May 2019
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did you change the injectors when you changed the IP ?
these diesels dirty the oil real quick when the oil is changed not like Japanese Diesels where the oil stays clear for several thousand miles
IF it's not making oil then I wouldn't worry about it.
these diesels dirty the oil real quick when the oil is changed not like Japanese Diesels where the oil stays clear for several thousand miles
IF it's not making oil then I wouldn't worry about it.
Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
Likes: 219
From: Northwest
If it were mine, I'd back track to the mechanical fuel pump and verify there is not an internal leak before looking at a leaking seal in the IP.... There are just not that many places for cross contamination. A little bit of dye can go a long way.
Hobo
Hobo
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Joined: Jun 2017
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From: Edmond, OK
The mechanical fuel pump on my 6.9l failed and pumped diesel fuel into the crankcase. It was a fast enough leak that I drained the oil, dropped the oil filter and added new oil and the level was high on the dipstick after a 10 mile drive. After I replaced the mechanical fuel pump the problem was fixed. 
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