"Topping Off" Your Gas Tank

courtesy of Bob, The Auto Answer Man


Dear Bob,
I've have read in car manuals that when filling up with gas you should stop when the pump stops automatically. My husband always puts more in and says that he can get another few gallons in the tank. Why is it important to not to put more gas in after the pump shuts itself off?
Chris

Chris,
Well, what could happen, and I have seen it first hand, is that when you "over fill" a tank, liquid fuel gets trapped in the vapor line. When people complain about fuel smell in the car, well, that is what it is from! Also, when filling to the top, there is no room left for expansion left when the fuel heats up. This can cause another problem! Now, usually after the pump clicks off, you might be able to get another 50 cents worth or a gallon tops, but not more than that.
Good Luck!
Drive Safely!
Bob, The Auto Answer Man


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