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06-18-2009, 08:50 PM
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CC Member
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Join Date: Apr 2006
Location: Oakville,
Ont
Cobra Make, Engine:
Posts: 322
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Not Ranked
oil has slight smell of fuel
what would cause the oil tohave a slight smell of fuel?
carb dumping too much fuel? carb not properly set? |
06-18-2009, 09:05 PM
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Senior Club Cobra Member
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Join Date: May 2006
Location: Manteca,
Ca.
Cobra Make, Engine: None, sold it
Posts: 2,439
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Not Ranked
maxum 101
If you have a stock mechanical fuel pump, the diaphram could be bad letting fuel drip into the oil pan.
Do not drive or start this vehicle until you find out what this is.
Terry |
06-18-2009, 11:28 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Drain and replace the oil and filter without fail, for no other reason that the fuel will compromise the lubrication qualities of the oil, and risk damage to the bearings. Its possible that as mentioned fuel may be entering via the fuel pump or what is more common is that the carb is set up rich and unburnt fuel is getting past the rings, check the color of the plugs.
As an example: I'm sure this is not the case with your particular car but once I was witness to a fellow doing a Tune-up on a 3 or 4 year old 74 Torino with a 351 that had been badly neglected as far as routine maintinence goes. This guy was sort of a crusty guy, you know the type: Burley chested, heavy smoker, wearing coveralls in his late 50's or early 60's. Well, while he was working under the hood with the car idling the fuel in the crancase oil ignihted and literally exploded with enough force to tear the sheet metal valve covers loose from the surrounding bolts that hold them on, same thing for the pan and several of its bolts. It rung this guys bell so hard he left for the rest of the day. You do NOT want to ever experience this.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 06-19-2009 at 12:43 AM..
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06-18-2009, 11:41 PM
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CC Member
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Join Date: May 2008
Location: San Jose CA,
CA
Cobra Make, Engine: SPF_R_/BRG/FRBoss302/327CI/FordEFI/Under_Car_Exh/
Posts: 2,523
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Not Ranked
or a leaky carb or heat situation that has the fuel going down the intake with the car off. - ricks point on the oil is a good one, you dont want to bathe the bearings in gasoline diluted oil .. very baaaaddd.
__________________
Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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06-19-2009, 05:23 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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Not Ranked
first check the diaphram in the fuel pump. it is a direct link between the oil & gas
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__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
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06-19-2009, 08:20 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
Quote:
Originally Posted by CobraEd
first check the diaphram in the fuel pump. it is a direct link between the oil & gas.
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Yep, my money's on the fuel pump. BTW, this is another example of why you should send in an oil sample -- to check for coolant and fuel in the oil. Coolant, of course, should not be in the oil at all, and fuel levels you should be under 1 or 2 PPM. Here's a typical report with the coolant and fuel report at the very bottom.
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06-19-2009, 10:11 AM
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CC Member
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Join Date: Apr 2006
Location: Oakville,
Ont
Cobra Make, Engine:
Posts: 322
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Not Ranked
thanks for the posts
whats involved in removing the fuel pump? do i need to get a new gasket or anything like that. anything to watch for when removing it or putting it back?
i figure ill start with checking for a leaking diaphram first.
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06-19-2009, 10:40 AM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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Not Ranked
two bolts & the in and out fuel lines
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__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
________
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06-19-2009, 10:42 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,897
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Not Ranked
It's an easy job, but I didn't see what kind of engine you have. Here's a pic of mine on the side of my FE. You just unbolt it and pull it out. Now, on the off-chance that you have an electric fuel pump, don't go to the trouble of messing with it. 
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