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Old 03-30-2001, 11:06 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,124
There is a tremendous rush of air into the fuel tank when I remove the filler cap. Whether I'm filling up from an empty tank of half a tank, I break a strong vacuum (sounds like a terrible health problem). Is there some vent I should check or is it normal for the fuel tank to suck in rodents and small pets?

As a side note, I have a nagging rough idle but it accelerates and cruises like a dream.

91 300SE
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Old 03-31-2001, 04:25 PM
David C Klasse's Avatar
CheFrac is Back!
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Yes, the pressure in the fuel tank is normal. Mine does the same thing. I believe the gas tanks work somehow by being pressurized.

As for you rough idle, mine idled crappy, but drove like a dream too. It turned out to be the fuel filter. Check for the last time it was replaced on your car. Check spark plugs also. GOod luck!
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 04-02-2001, 06:54 AM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
The former 1985 300SL of my mother had the same need of air as soon as the filler cap got removed. The tank of my 1990 300SL has a smaller need of air. The vacuum in the tank of the 1990 300SL is not half as big as with the 1985 300SL...Both cars run great and I never figured the vacuum in the 1985 300SL tank to be a problem.

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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