Fuel Fouled Oil?

[enkeivette]

So I was bringing the Vette back to life yesterday, and the float got stuck open.

The motor ate 3+ gallons of gas idling over the course of probably less than an hour of run time (I know because I had to fill it). It sucked so much gas that when I realized what the problem was, I saw gas spurting out from between the bonnet and the carb.

So, my question, do you guys think my oil is now fuel fouled? (Just put in 7 quarts of mobil 1 before I fired it up, and I know that philosophically it makes sense to spend the $50 and do another oil change to protect my investment, Im just hoping someone has some reassuring knowledge that can save me from the hassle).

[Shaolin Crane]

Jesus, absolutely. Change the oil, do not run it. Prime the engine for a significant time, change the oil again. Even for safe measure I'd squirt a bit in each cylinder too. Fuel wash is no joke and will fuck up a motor quick.

[Vettezuki]

More of a chemistry question, but does fuel make a solution with oil? I imagine it can make an emulsino but not a solution. IOW, if you take the fuel foiled oil out, let it settle and expose it to the atmosphere, I would *think* the fuel would separate, rise to the top, and evaporate, leaving mostly oil. I still wouldn't run it, because who knows what has chemically happened to the oil. Even just a change in pH to being too acidic would f up bearings if nothing else.

I don't know the answer, but agree with Guy on the better safe than sorry route. Not something to cheap out on.

[enkeivette]

Balls

[enkeivette]

Btw, to save face, and so yall know that Im not a complete idiot, the car was on a slanted driveway. So it appeared as though the fuel levels were correct. So I was wasting time chasing non existent tuning/ timing non-issues. It wasnt until I put it on a level surface that I could see it overfill.

[Shaolin Crane]

More of a chemistry question, but does fuel make a solution with oil? I imagine it can make an emulsino but not a solution. IOW, if you take the fuel foiled oil out, let it settle and expose it to the atmosphere, I would *think* the fuel would separate, rise to the top, and evaporate, leaving mostly oil. I still wouldn't run it, because who knows what has chemically happened to the oil. Even just a change in pH to being too acidic would f up bearings if nothing else.

I don't know the answer, but agree with Guy on the better safe than sorry route. Not something to cheap out on.

Yes, once the fuel breaks down the oil it is a new solution. It will not separate, or evaporate. I wish it would, we wouldn't have nearly so many drums of waste at the shop. It's no different than mixing two cycle oil or alcohol cars that have theirs mixed with transmission fluid or silicone. Since the fuel is a solvent, and an excellent one. Once it's broken down, that's it.

There's no way around it, it needs to be drained, refilled, mechanically primed (meaning don't crank it) then drained again. Then if it were me, run it for a few miles and change it again.

[Shaolin Crane]

Btw, to save face, and so yall know that Im not a complete idiot, the car was on a slanted driveway. So it appeared as though the fuel levels were correct. So I was wasting time chasing non existent tuning/ timing non-issues. It wasnt until I put it on a level surface that I could see it overfill.

There's no judgement, shit happens. However we will judge if you are lazy, run it and fuck up your motor. :jester:

[Vettezuki]

Yes, once the fuel breaks down the oil it is a new solution. It will not separate, or evaporate. I wish it would, we wouldn't have nearly so many drums of waste at the shop. It's no different than mixing two cycle oil or alcohol cars that have theirs mixed with transmission fluid or silicone. Since the fuel is a solvent, and an excellent one. Once it's broken down, that's it.

There's no way around it, it needs to be drained, refilled, mechanically primed (meaning don't crank it) then drained again. Then if it were me, run it for a few miles and change it again.

That makes sense.

[Damian]

This happens to SyTy guys quite often. The fpr diaphragm tears and dumps fuel into the oil. They don't know it and next thing you know, the bearings are wiped out.