Faulty Sensor
 

The fuel sensor needs to be replaced. I had the same issue and the sensor was replaced and issue resolved. I only had a 1/4 of a tank when it was taken in and they filled it up to the top to ensure the problem had been resolved! Schedule an appointment.

Ok thanks. I'll ask them about it.

It won't harm the vehicle though even if it's not fixed right?

It seems to me that there are two separate and distinct problems being described here.

Your initial post said (as I read it) that the gas station pump switched off before the tank was full. The tank wasn't full, and the gauge didn't read full. If you topped it off manually, the tank was then full, and the gauge read full. That isn't a sender problem, it is a problem of air being trapped, too fast a pump, etc. It isn't a vent problem, since the on-board system doesn't vent while filling. It is an annoyance, but nothing serious. It could be a pinched filler pipe, but that is unlikely.

Other posters are describing problems whereby the sender is malfunctioning, and the gauge is reading incorrectly. That is a different situation than you describe. If you fill the tank manually, all the way to full, and it still reads less than full on the gauge, then I would agree it could be the fuel sender. Also, if you don't top off the tank, but instead just turn the key off and on, and get a different gauge reading, then it could be the sender.

we can do that??? refuel with engine on???!?!?!!

NO

Oh I see. Then there's nothing wrong. Thanks.

Flame all you want, I do it all the time and don't see what the big deal is..

Not a big deal at all, just unsafe, illegal, and can throw codes. But if running your engine is more important than all that, go for it. You must be that guy at the centre of the universe I've heard so much about.

Personally, I ask other drivers to turn their engines off if they are running them while refueling. If they refuse, I can hit the emergency stop button, shut down all the pumps, and blame it on them.

I have a family member who works for an oil company, and is often on retail site visits. They hit the same emergency stop switch in that circumstance.

Seriously? You don't see the problem with exposing a highly flammable liquid to oxygen and potential static electricity?

YouTube - Running Car Catches Fire at Gas Pump

Yes a running car does cause static electricity.... I know it's hard to believe...

Come on man....

The fact that you don't see a problem, IS the problem.