Gasoline in motor oil

[Headshot zod]

1979 Chevrolet Caprice 302/5 can't remember. Mechanic told my uncle there was gas in the oil. How would this happen? Trying to figure out if he is being taken to the cleaners.



T. I. A.

 

[TSpecht]

That should have a mechanical fuel pump that is attached to the engine and driven from a pushrod with the assistance of the cam. The diaphragm could allow fuel to leak out and it would leak into the crank case if I recall correctly. Mechanical fuel pumps are usually quite easy to replace, provided you can get at it, and have some flare wrenches for the lines that go to it. At least that's the most likely method I can think of for fuel getting into the oil.

 

[Headshot zod]

That makes perfect sense. If it's like the Chrysler its 2/3 bolts on and off.



Thanks a lot.

 

[Philip]

That year used a mechanical fuel pump. It is block mounted. Look under the ALT. Also look on the front of the block just above it. There are two bolt holes. On has a bolt and the other one doesn't. The one with bolt. Remove it ( this bolt is only 1/4" long or so) and put a longer bolt in and tighten it up some (not to tight eather). This will lock the fuel pump rod in place and you won't have to fight getting the new pump on.



A sticking choke will also dump to much fuel into a engine and cause a fuel in oil condition.

 

[dslmacdown]

Yes, I agree with the others here. I spun rod bearings in a '79 Buick because of a leaking fuel pump.

 

[midlife crisis]

I agree with the others as well. . my first guess would be the FP.

Although, before I changed it out, I would pull the air cleaner off before shutting the car down HOT, and make sure the needle/ seat wasnt leaking/letting fuel by (hung float). Lose the cigarette.

 

[SGibson]

try lighting the dipstick