05-11-2009, 02:02 AM
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#2
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mikeyt is currently offline
Status: Platinum Contributor
Join Date: Jul 2007
Location: Ontario
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My Year: 1996
My Model: Shabah 180
My Engine: 4.3
Thanks: 87
Thanked 579 Times in 538 Posts
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Re: 4.3 liter engine problem
Assuming that you have a mechanical fuel pump, it sounds like a leak in the diaphragm of your fuel pump is causing the problem. Because one side of the pump diaphragm contains fuel under pressure and the other side is connected to the crankcase of the engine, if the diaphragm splits (a common failure), it can leak fuel into the crankcase.
It's also possible that raw fuel is getting past worn piston rings (blowby) but any amount via that method would be very small so i would suspect the fuel pump diaphragm first.
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