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Old 04-08-2003, 05:40 PM
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Join Date: Mar 2003
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gas in oil

will a bad fuel pump cause gas to mix with engine oil? the car is a 72 250.

Last edited by junk man; 04-08-2003 at 05:48 PM.
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Old 04-08-2003, 05:56 PM
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Location: SoCal
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Is that FI? If so, is there a return hose from the fuel pressure regulator to the breather? That would likely indicate a ruptured diaphram.

Another possibility is fuel leaking past the rings when the engine is cold. This is normal to a degree, but it should burn off after 10 mi or so of driving. Lots of short trips without the engine warming up could cause the smell.

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Old 04-08-2003, 09:52 PM
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Location: Falls Church, VA
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A hole in the fuel pump's diaphragm will cause fuel to get into the oil.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 04-09-2003, 07:54 PM
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Thumbs up

it is not FI. when I get the time I will check the fuel pump. snow and mud here. thanks for your replies.
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