W114 gas smell - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 05-10-2013, 05:21 AM Thread Starter
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W114 gas smell

I know it's an older car and this is my second car but I do smell gas around the car more than I should in my opinion
It's not in the trunk and the exhaust seems fine.

In my opinion is coming from the engine bay. I don't have the housing air filter installed as I am waiting for my k&n filters.
Fuel hoses are all replaced.

Where else can I check and what are the usual culprits?

Thank you.


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post #2 of 7 (permalink) Old 05-11-2013, 04:44 AM
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W109 1969 280 SEL

I have the same problem. I know it's an old car too, but the fumes are not pleasant. I have replaced the gas lines and the gas cap. Mine seems to be
worse when I open a front window when going 60 mph. 2 MB guys have looked and can't seem to find anything....durn. Any suggestions?
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post #3 of 7 (permalink) Old 05-11-2013, 05:40 AM
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Same here, only when windows open at 50-60. I'm just passing it off for now, it's an old car.
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post #4 of 7 (permalink) Old 05-11-2013, 05:55 AM Thread Starter
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I have had 74 before and there was no smell at all. I know something is wrong but song know what.
Suggestions?

Thank you


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post #5 of 7 (permalink) Old 05-11-2013, 07:21 AM
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My '74 280C does it. My '71 250C doesn't. It also seems worse with the front windows down and cruising down the road. I think mine is from the vapor canister in the trunk. When I open the lid on a hot day I get the smell strongly. The sender gasket isn't leaking, the vent lines are clear and I don't see any fuel trails. The problem seems worse when the tank is more than 3/4's full.

I know mine isn't from a leaky carb because I converted to F.I.. I can't help but think it has something to do with a routing problem of the original vent line on mine. I'm going to route the vent into the air intake plumbing to try and create a low pressure open vacuum condition while running. Can't run a sealed vacuum to the canister because it will collapse the tank. Ask me how I know.

Not having the stock air filter housing or a bad gasket can cause the problem.
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post #6 of 7 (permalink) Old 05-11-2013, 10:34 AM
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Quote:
Originally Posted by Mike D View Post
Not having the stock air filter housing or a bad gasket can cause the problem.
My 72 250 does not have this problem. I have after market k&n filters on the carbs. I did install a new cork fuel level sending gasket when I had the tank boiled out. And a new gasket on the gas tank cap. I know my system is tight because when I go to fuel up, and I unscrew the gas tank fuel cap, some pressure is released.
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post #7 of 7 (permalink) Old 05-11-2013, 08:47 PM Thread Starter
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My fuel gasket is good too


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