I have a tip that many of you may not know.
The fuel tanks on cars generate vapors and cars have vapor canisters with carbon filters to prevent vapors from entering the atmosphere. As fuel is burned in the tank, an equal volume of air is drawn past the carbon into the tank, thereby cleaning the carbon filter.
If you continue to "bump" fuel into a tank when the tank is full, you can flood the carbon canister with gasoline. When the engine runs, it is trying to pull vapors out of the carbon, but a vacuum develops in the tank because the carbon is full of fuel instead of vapors. The car can stop completely if it cannot get enough fuel, the check engine light can come on, and you might need to replace the carbon canister to the tune of several hundreds of dollars.
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