Ban on topping off gas tanks in effect | StatesmanJournal.com | Statesman Journal: "Oregon gas station attendants can no longer 'top off' gas tanks because of new state environmental regulations.
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Topping off is when a gas station attendant continues to fill a gasoline tank after the nozzle clicks off.
The ban on 'topping off' is designed to reduce benzene and other toxic air pollutants from Oregon gas stations and other gasoline storage and dispensing facilities.
Topping off causes gasoline to spill and release benzene, a known carcinogen, and other toxic air pollutants. Also, most modern pumps simply return the fuel back into the pump after the overflow click, which means drivers are paying for gas that does not get into the fuel tank.
In some cases, overfilling a gas tank can cause a vehicle's vapor control system to clog and stop working, which can require costly repairs."
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