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  #1  
Old 02-15-2002, 09:01 PM
Clauser1
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Over Filling Gas Tank

My BMW owners manual (E 30) says never overfill the gas tank
cuz it may affect some emission components.On 2-3 rare
occasions, I did overfilled my MB.Is there any harm done?
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  #2  
Old 02-15-2002, 10:05 PM
renok7's Avatar
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Join Date: Nov 2001
Location: Montréal
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Not a problem if it happens only once in a while. The following is a reproduction of a simple explanation.

"Your emission control system actualy consists of several sub-systems, one of which is designed to prevent raw gasoline vapors from being released into the atmosphere. It does this by trapping the vapors in a charcoal-filled canister so they can be drawn into the engine and burned later when the engine is running. If you continue filling the tank beyond the normal "click-off" point you can overload the system with vapors. This can cause the engine to run "too rich" and could eventually ruin the charcoal canister."
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Old 02-15-2002, 11:14 PM
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And you will get slobber marks on your 1/4 panel which looks disgusting.
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Old 02-16-2002, 10:30 AM
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ALMOST all 1998 & later MB's have OBVR (on-board vapor recovery) systems & if you try to keep filling after the nozzle clicks you CAN & will do damage to that system. ALSO you might get a fuel bath when removing the nozzle! HAVE seen several collasped fuel tanks from this! Don't overfill these models!!
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  #5  
Old 02-16-2002, 05:16 PM
Clauser1
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Thanks Doc.I've seen a of lot people
overfill their gas tank esp.when gas
prices goes down.
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