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Discussion Starter · #1 ·
We picked up a truck the other day that had a "rebuilt engine", Wellll, it ain't so rebuilt
we're finding.

But here's the problem, we started and ran the truck, worked good, lots of power, no problem noises, then the other day we started it, and it was knocking and backfiring. Here's some of the stuff we found, 3 plug wires ohmed out at 6, 7 and 20, oil was full of fuel, oil pump grinds.

Would the bad wires, case the knocking if they didn't fire in time? would they case the fuel in the oil?
 

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sounds like you ruptured a diafragm in the fuel pump.As far as the spark plug wires causing the problem i would say no.Definetely drain the oil and replace the wires.I cant figure out how you can hear yhe oil pump grind.If you ran it very long with that much fuel in the oil its not going to be a pretty picture.Good Luck
 

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Discussion Starter · #3 ·
We decided to replace the oil pump anyway, since we had the pan off, and where down there. When we removed it, we spun it to see if it was bad and noticed the noise.

Hard to say, probibly 20 miles on the engine before we noticed the fuel in the oil, very distinctive smell..

This truck has an electric fuel pump, anyway to test the diaphram? or would a manual be better?
 
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