Gas in my oil??????

[Nickdogg]

I have a 3.0 4clyd cobra, i went to drain my oil and i have gas in it.Alot of gas. I took my heads to shop they pressure testd them, cleand,and told me my valves lookd good. What do i need the check now????? Can any one help. Thank You

 

[d_carter]

Re: Gas in my oil??????

If you have a mechanical fuel pump on your block it is not unheard of for it to be leaking right into your crankcase.

 

[Nickdogg]

Re: Gas in my oil??????

Ok i will check it out. What do i need to look for a bad gasket or just a bad fuel pump??

 

[rickryder]

Re: Gas in my oil??????

The diaphragm in the pump cracks letting raw fuel into the crank case via the pump lever hole.

 

[HT32BSX115]

Re: Gas in my oil??????

The diaphragm in the pump cracks letting raw fuel into the crank case via the pump lever hole.

That's true.


If that's happening there may also be fuel in the clear hose that runs from the fuel pump up to the carb air intake.

If there?s no hose it either fell off or it doesn?t have it. It if doesn't have a hose or fitting on the fuel pump for it you may have an automotive fuel pump on the engine

 

[Nickdogg]

Re: Gas in my oil??????

Yes it has this hose,but didnt c no gas in the hose. If the fuel pump is letting gas in oil,Could this b the reason my motor startd running rough???

 

[HT32BSX115]

Re: Gas in my oil??????

Yes it has this hose,but didnt c no gas in the hose. If the fuel pump is letting gas in oil,Could this b the reason my motor startd running rough???

No.

but you could have other carb problems including a stuck (open or closed) choke, plugged jet etc......

 

[a70eliminator]

Re: Gas in my oil??????

Yes it has this hose,but didnt c no gas in the hose. If the fuel pump is letting gas in oil,Could this b the reason my motor startd running rough???

The tube from the fuel pump to the carburetor flange will cause the engine to run rough if the diaphragm goes bad, thats it's purpose, in turn the overly rich running condition will contaminate the crankcase oil with fuel.

 

[drrm123]

Re: Gas in my oil??????

You may want to check for a sticking needle and seat in the carb. Letting extra gas leak while idling or while engine if off. Leaks into cylinders and past rings into crankcase.

 

[GA_Boater]

Re: Gas in my oil??????

Yes it has this hose,but didnt c no gas in the hose. If the fuel pump is letting gas in oil,Could this b the reason my motor startd running rough???

Yes!!! Your fuel pressure is most likely very low because the gas is going into the crankcase instead of the carb's float bowl.

Don't touch your carb unless the new marine fuel doesn't cure both problems. You should fix one thing at a time. Don't complicate matters. If you have changed oil before replacing the fuel pump and restarting you might as well test your fuel pressure first. If pressure is low change the pump and most likely the oil/filter again. Hope this helps.

 

[Nickdogg]

Re: Gas in my oil??????

Carb has been rebuild by machanic,so just gunna get a new fuel pump..

 

[Pete104]

Re: Gas in my oil??????

Fine! Just get 1 for marine application.

 

[Nickdogg]

Re: Gas in my oil??????

has this ever happen to anyone???