What would happen if you put gas in your car while it’s on?

Answer 1

I would listen to 'thebax' - he's probably the most knowledgeable one here.

Answer 2

the gas fumes can blow your car

Answer 3

Refueling a running vehicle increases the chances of gas vapors coming into contact with heat or electricity. Anytime you top off your gas tank, there's a chance the gas pump's automatic stop mechanism will fail, causing your gas tank to overflow and spatter gasoline onto the ground.

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Answer 4

Nothing people do it here all the time.

Answer 5

You can NEVER BUY GAS THERE AGAIN.  They will remember you.

Answer 6

Your tank would fill up. But the risk of fire goes way up.

Answer 7

The charcoal canister vent valve doesn't open and gasoline can back up the filler tube and get into the charcoal canister ruining it. Symptoms of this happening are hot restarts and vent valve codes.

Answer 8

This was banned a long time ago, when there were often stray sparks in the ignition or electrical system if it was running. Fuel vapor plus a spark can mean - boom!  It's far less likely these days, but no-one has considered it appropriate to repeal the requirement.  It's better to be unnecessarily cautious than risk it. 

Plus there's the likelihood now that the car will detect the cap being missing and throw that up as a fault.

Answer 9

Refueling a running vehicle increases the chances of gas vapors coming into contact with heat or electricity. Anytime you top off your gas tank, there's a chance the gas pump's automatic stop mechanism will fail, causing your gas tank to overflow and spatter gasoline onto the ground.

Answer 10

An opportunist would steal your car because you left it running while standing in the back