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Old 01-30-2007, 08:44 AM
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Join Date: Aug 2006
Location: Houston, TX
Posts: 450
Pressure from Gas Cap

I'm guessing somethings afoul with the evaporative recovery system on my car. Even in cold weather, when I open the cap to fill the tank, there's a noticeable rush of air.

Is this normal? I'm not getting any codes from the computer (assuming it's the LH-SFI computer I should be scanning).


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Old 01-30-2007, 10:04 AM
rg2098's Avatar
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Join Date: Jun 2004
Location: Rochester Hills, MI
Posts: 2,415
What vehicle? Most tanks should have some pressure in them to force the evaporative emissions out to the recovery unit.
Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section
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Old 01-30-2007, 10:29 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
the evap system has a valve which holds about 6-7psi [from evaporation due to heat from the sun] and it is quite normal to hear noise even in winter and especially when tank is heading to empty.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 01-31-2007, 11:25 AM
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Join Date: Aug 2006
Location: Houston, TX
Posts: 450
sorry - 92 300SE - but if pressure is normal - (I usually wait to fill up until I see the low-fuel light, so it takes 22 or so gallons) then I won't be concerned.

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