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Labels: Personal Safety. When the gas pump nozzle clicks off automatically, DO NOT add a little more gas. You need extra room in your gas tank to allow the gasoline to expand. Topping off your gas tank is bad for the environment and your wallet.Any additional gas you try to pump into your tank may be drawn into the vapor line and fed back into the stationâs storage tanks.(Of course you're still paying for this extra gas).opping off your gas tank is bad for the environment and your wallet. Any additional gas you try to pump into your tank may be drawn into the vapor line and fed back into the stationâs storage tanks. (Of course you're still paying for this extra gas).
Fuel Tank Venting. Your tank has to breathe. In order to breathe, your tank must have a vent somewhere that will relieve both vacuum and pressure. Gasoline expands in volume as it warms up and shrinks in volume as it cools down. The fuel level of your tank changes throughout the day, even if you are not driving it.You cannot put fuel into your tank, unless you can get the air out...and you cannot withdraw fuel from your tank unless you can let air in.Up through the 1960's, most vehicles used vented gas caps. This is simply a gas cap with a hole in it.ou cannot put fuel into your tank, unless you can get the air out...and you cannot withdraw fuel from your tank unless you can let air in. Up through the 1960's, most vehicles used vented gas caps.