1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Fuel in oil

Old Aug 15, 2011 | 11:34 PM
  #1  
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Default Fuel in oil

I think I got fuel in my oil cause my oil level went up and it smells like fuel what's everyone's input on this ????
 
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Old Aug 16, 2011 | 12:49 AM
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Maybe your lift pump is leaking.
 
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Old Aug 16, 2011 | 12:59 AM
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oh ya didnt think of that what about the injection pump could it be that too???
 
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Old Aug 16, 2011 | 07:50 AM
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If you're still running the stock/OEM diaphragm type lift-pump, it's time to replace it.

Generally, the only route for the IP to dump fuel into the crankcase is by way of the main pump-shaft seal. From what I can tell, the only way to pop that might be with a very high inlet feed pressure.
 
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Old Aug 16, 2011 | 08:10 PM
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Ok good to know I bet it is the lift pump then
 
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