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Gas in Oil?

Bo Dillingham

Well-known member
Joined
Jun 23, 2001
Messages
121
Location
Cortland, NY, 13045, USA
Corvette
1965 crimson pearl (2002 cadillac?)
Ladies and Gentlemen,
Again, I have a problem that does not appear to have an easy solution. For one, I have changed the oil in my small block powered ’65 three times in the last couple months, and get severe recurring gasoline dilution of the oil. The level on the dipstick rises above the full mark, smells like gasoline, and drips off the end of the dipstick like water.
This problem has persisted in spite of a new carburetor. The spark plugs look great, so I do not attribute it to too much fuel going into the manifold.
The PCV system is a closed system with the vent tube connected to the inside of the air cleaner, and the vacuum line connected to the oil filler neck. I have run the vacuum line through A PCV valve (in the right direction) and into the correct vacuum connection on the back of the Holly 4160 (but I do not have an orifice in the line as is mentioned in a Corvette description of the PCV system).
When I check the PCV system by putting my thumb over the vacuum line, I feel a healthy vacuum. Then I put the hose back on the oil filler neck (with the oil filler cap on tight) and watch the fumes coming out of the vent tube at the air cleaner. It seems to me that a strong vacuum at the oil filler neck should be sucking the fumes out there instead of letting them escape at the inlet?
Also, I smell gasoline once in a while when I’m driving, but not all the time.
One of my associates said that I may have a leak between the fuel pump and the crankcase. Any Ideas????
Thank you for your time and help,
Bo Dillingham
 
Joined
Nov 4, 2000
Messages
947
Location
Scottsville, Kentucky
Corvette
08 Jetstream Blue Z51 coupe
Gas in the Oil

Bo

Your associate is absolutely correct. You most likely have a failing diaphram in your fuel pump. Since it is driven off the cam there is direct access to the oil galley in the event of a failed diaphram. Fuel dilution is serious, it will cause bearing failure from top to bottom. I think a new fuel pump will solve your problem.
 

Ken

Gone but not forgotten
Joined
Jan 30, 2001
Messages
8,237
Location
Hermosa Beach, CA
Corvette
1987 Z51 Silver Coupe
radstad66, I hope that's not going to be your signature photo. :eek

It's beautiful, but... TOO BIG! :L

Check this out for forum recommendations: Signature/Forum Update

Thanks.
 
S

ssvett

Guest
Yep, I'm with Dale

I too would suspect the fuel pump. and I would not wait too long to replace it. It could go boom in a very big way..........Steve
 

radstad66

Active member
Joined
Mar 25, 2001
Messages
36
Location
Brookfield, WI
Corvette
Blue 1966 Roadster, Black 1986 Coupe
Yes, I know, I thought I deleted that out before I logged out. Sorry:confused
 

Tom Bryant

Well-known member
Administrator
Joined
Nov 9, 2000
Messages
7,195
Location
Edgerton, Ohio, United States
Corvette
1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
rafstad66

It was a great picture though.

Tom
 

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