Why Does The Gas Shut Off At The Pump Before My Tank Is Full?

This is something that you may experience from time to time. You are filling up your car with gas and, lo and behold, before you have five gallons in the tank the pump shuts off as if the tank has filled up. What gives? Well there are a couple of reasonable explanations as to why this occurs.

It used to be that there was no one-way seal in gas tanks. All newer cars do not allow vapors to escape out of the tank. When you insert a gas nozzle, you are doing so in a pretty air-tight way. Those vapors that used to escape were causing asthma and air pollution. So, all those fumes are shunted off into an evaporative canister until the next time you start the vehicle and they can be combusted.

If you are one of those people who squeeze in an extra 75 cents of gas to get to the even 37 buck mark, you could very well have actual gas spilling over into that evaporative canister. That would then cause the tank to “think” that is is full, and trigger the pump to stop filling the tank.

You could also have a faulty solenoid in the canister causing it to think the tank is full. If you are experiencing premature pump shutoff when filling up your tank, come in and see us. We may be able to easily make that problem disappear! If you live in Essex, Burlington, South Burlington, Colchester, Winooski, Williston, Shelburne and anywhere in the State of Vermont be sure to contact Handy’s Service Center for all your auto repair needs!