fuel tank

I have an old electric fuel pump. I don't remember exactly where it came from. Plumb in where easiest. Sometimes at the tank. Sometimes by the pump on the engine. Using a remote start switch as a dead man switch, wire to the battery however is easiest. I know jumper cables were part of this once!
If the pump is running, and your gas can isn't filling up, you're blowing air into the tank. Switch the polarity, and you're good to go.