Motorists often comment that it is possible to fill their vehicle’s fuel tank with more fuel than the vehicle’s manual says it should be able to take. The reason is that modern fuel tanks include an air space to allow for expansion of the fuel as temperatures change.
If the air gap is filled with fuel, the fuel may have no room in which to expand as it heats up during the day. This may result in it leaking out of the vehicle.
Fuel leaks are a fire risk. It may only take a passer-by flicking away a cigarette butt near a parked vehicle to start a fire. Fuel leaking into the environment can also contaminate soil and ground water.
Prevent fuel leaks by only filling your fuel tank until the pump at the filling station turns off automatically.
Tip courtesy of Bridgestone