gas in oil

[hodsyA]

I have a 1990 omc 3.0L cobra the engine gets gas in the oil. I am talking about liters of gas. the engine has been out of the boat and been electro tested and rebuild still the same problem.

 

[Don S]

Re: gas in oil

Replace the fuel pump.

 

[hodsyA]

Re: gas in oil

The fuel pump is new that took 9 months to find.

 

[AZSenza]

Re: gas in oil

The fuel pump has a diaphragm in it, fuel on one side oil on the other.

 

[AZSenza]

Re: gas in oil

well, it it were a jet engine I'd say your fuel heater/oil cooler was leaking but on a gas mechanical fuel pump engine, thats the only place the two can come together. Does it start ok? It's possible that you have a needle stuck in tha carb and when you shut down its dumping excess into the cylinders??? But that would show up as a hard to start/run

 

[Gary H NC]

Re: gas in oil

That much gas getting in the oil it's about 99.9 percent a fuel pump problem...
No way that much fuel is getting past the rings in the cylinder and it still runs..

 

[hodsyA]

Re: gas in oil

Is their any chance it would be carburator or the floats?

 

[Don S]

Re: gas in oil

Not with the engine running.

 

[hodsyA]

Re: gas in oil

dose any body know a place to get omc parts.

 

[Bondo]

Re: gas in oil

Ayuh,... Right where it says OMC parts at the top of this page...

 

[a70eliminator]

Re: gas in oil

All I can think of that hasn't been mentioned already would be the carb overflow return line to the fuel pump being hooked into manifold vacuum somewhere and it's pulling fuel out and into the crankcase.

 

[Don S]

Re: gas in oil

Even if it was dumped directly into the intake manifold, with the engine running it would still be sent to the combustion chamber and burned or flood the engine.
If the engine wasn't running, the fuel pump wouldn't be pumping so there is no way in ell you are going to get liters of gas into the oil.

 

[a70eliminator]

Re: gas in oil

Oh yea thats right dahh!

 

[Gary H NC]

Re: gas in oil

Not sure what pump it takes but here is a list with pictures of the pumps,
http://bpi.ebasicpower.com/c/ALL4C/fuel_pumps.htm