Saturn engine oil pan fills up with gasoline.

DAN003C

MEMBER
SATURN

Hello guys, The question I have is why after filling up my Saturns gas tank up, driving for two hours at 55mph, my gas gauge drops to around 1/2 a tank of gas, and I begin to lose engine compression. I drain my engine oil pan and get gallons of gasoline from it?

The engine starts fine, do the fuel injectors not operate properly, do my piston rings need replacing, there is no blue smoke from the exhaust.

This is a 1991 TwinCam 16V 1.9 liter engine,
with 193563 miles on the odometer.

Thanks in advance, great web site.

5 Replies

PEPPERMRJ

MECHANIC
1,158 POSTS

Ouch. :Evil: And I thought my son's 85 continental got bad gas mileage.

Has there been any work done recently? How and when did this start?

There is no way under norrmal engine operation for that much gas to geet into the crankcase. A leaking injector, a leaking pressure regulator, and the line from the EVAP canister all would feed fuel thru the intake and into the combustion process.

You would have to hook up the fuel line to the fresh air intake of the PCV system. Check the routing of all fuel lines, vacuum lines, and vapor lines.

A steady flow of gas from a bad pressure regulator, carbon cannister, or bad fuel injector would still have to pass thru the combustion chamber. That would cause flooding, fouled plugs, and a heap of smoke. Yes, I know I am repeating myself.

Good luck and let us know. :)

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Monday, April 3rd, 2006 AT 12:04 AM

PEPPERMRJ

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1,158 POSTS

Enquiring minds want to know, Wassup?

Still getting 2 gallons in the oil pan? Are you measuring this wiht the dip stick? Is the engine still running without symptoms?

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Tuesday, April 4th, 2006 AT 12:42 AM

DAN003C

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Thanks for your input friend, I look into some of the things you talked about.

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Tuesday, April 4th, 2006 AT 7:54 PM

DAN003C

MEMBER
3 POSTS

Thanks for your concern, yes my dip stick shows the oil level way to high, and again when I drain the oil from the pan I get more than 9 quarts of oil and gas mix from it. If I drain the oil pan, put new oil in it, I can drive for about an hour and the oil pan will over fill with gas and I start losing compression.

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Tuesday, April 4th, 2006 AT 8:01 PM

PEPPERMRJ

MECHANIC
1,158 POSTS

I think you have a leaky pressure regulator. Fuel is being sucked in thru it's vacuum line. With that mileage you are definitely getting blow by past the rings. As the crankcase fills there is no place for the fluid to go, It will then start to fill the combustion chamber. Not a good thing.

Fixing the fuel leak will return the engine to it's prior performance level. It is time for a rebuild tho. You can do a lot to those little engines while they are still in the car. Timing chain, bearings, and rings to name a few.

Goiod luck and let us know. :)

Keep the mail movin. :Twisted: