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Old May 21st, 2013, 08:05 AM   #1
gmotox
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Default 1979 doge 360 gas in the oil

Just purchased a truck from Arizona that was supposed to have a seized engine.
Truck has Edelbrock carb and intake.
Starting looking at it and the crankcase was filled with gas/oil. about 10quarts total
Drained out the mixture and filled with fresh oil.
Disconnected the mechancical fuel pump and ran an electric into a can of gas.
truck fires up and runs great so far.
Electric fuel pump will push fuel past floats and flood engine, so we just ran the pump intermittently.
Question:
Why or how would crankcase fill with gas?
Would bad manual pump leak into crankcase?
Could fuel siphon into carb and drain tank if floats were sticking?
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Old May 21st, 2013, 09:47 AM   #2
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I bought an edelbrock performer manifold that had a casting defect. You could see daylight through the bottom of the plenum into the valley. I was lucky and discovered it during assembly. I spoke with Vic jr who said it was common and sent a new one out.
Just my experience.
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Old May 21st, 2013, 10:08 AM   #3
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I had an Olds that I put a motor in. I plugged the gas tank vent line and the tank built up enough pressure to blow the needle and seat open, overfill, and drain into and past the cylinders, filling the crankcase with gas.
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Old May 21st, 2013, 10:16 AM   #4
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I had a bad mechanical pump on an old Chevy leak fuel into the oil. Changed the pump and problem solved.
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Old May 21st, 2013, 10:59 AM   #5
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Would not be the first time I've heard of a bad mechanical pump leaking into the crankcase.
Sounds like you got a deal on a cheap truck
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Old May 21st, 2013, 07:30 PM   #6
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Thanks for all info, I will update when the problem is solved.
I am going to change the pump and check needle and seat.
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Old May 24th, 2013, 11:00 AM   #7
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Changed fuel pump, reran fuel lines to factory tank.
It turns out the factory tank was bypassed and they were using an auxillary tank, I am thinking the auxillary tank wasn't vented and it built up pressure in the Arizona heat and pushed past float and drained tank and filled motor. No other problems found and the truck runs great. The Edelbrock needs a good tuning but other than that all is good. Good oil pressure, runs cool and smooth.
Thanks for all the suggestions.
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