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      12-18-2012, 02:42 PM   #19
goldminer
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Drives: 2011 SG E92 M3, 6MT
Join Date: Feb 2006
Location: Toronto, Ontario, Canada

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Quote:
Originally Posted by Meccos View Post
well im pretty sure the spilling is not caused by overfilling. The gas spills before the tank is full, in fact today I filled 10 gallons after the gas began to spill. Ive tried turning the gas handle 30 degrees but doesnt really help. I think i need to try to 180 degree turn next time. Could there by anything wrong with the car?... or is it the gas pump?
I understood that most modern fuel tanks are considered to be "full" before the tank is actually brim full. I was told that they are designed to have empty space at the top to allow for expansion of the fuel due to temperature change and for some emissions control reasons.

If you force the tank beyond its designed capacity and fill it right up to the top you could force spillage through a venting mechanism.