Since you said that you had to bang on the gas tank, it might be the fuel pump is sticking, and going bad.
bad fuel sensor in the gas tank.
sounds Like the pickup tube in the tank is bad.
No, the sending unit only tells you how much fuel is in the tank. It has nothing to do with how the vehicle runs.
YOU HAVE TO DROP AND DRAIN THE TANK
check for a hole in gas tank. or seal on top of gas tank or hoses going and coming from tank.
Pump it out with a hand pump.
The fuel sensor in the gas tank is bad and needs replaced.
You may have a bad ground in that case, the ground is at the top of the gas tank or the float inside the gas tank could have sunk or got stuck. Check your wires going to and from it not have a power or ground could do it as well.
The fuel filter in the gas tank may be going bad. There could also be a problem with the fuel pump itself not pump enough gas.
get it all out empty the fuel tank put good gas in the tank and crank it until it starts
Depends on how you get it out. If possible the tank should be drained and the lines disconected and flushed. If you can drain or syphon the tank on a modern fuel injected car the system should circulate the bad gas back to the tank in just a minute or two when trying to start the car. REMEMBER this will not work unless the tank has new good gas in it. The amount of bad gas in the lines should not hurt the new gas as long as you have a Half tank or more of new gas.
Add 1 bottle of ordinary rubbing alcohol to the tank. If The Bad gas is just gas that has water in it, then the alcohol will allow the water to "burn" with the gas. == == The best way to do it is kind of a pain. Take the tank off and dump the bad gas out. While the tanks off would be a good time to flush it out too. You can use a ordinary garden hose and siphone the gas out of the tank.
bad ground connection. Also the sending unit in the gas tank could be going bad.
A bad sending unit in the gas tank.
Bad fuel level sensor.
The sending unit in the gas tank is bad.
pull the gas tank
Could be water.
What kind of plastic gas tank. -If on a road-going vehicle, beware of insurance issues with repairing a gas tank ( to say nothing of possible fire due to gas leakage)
it gives you really bad gas but you can put the gas in your gas tank and 10 miles to the gallon
bad fuel pump when its full of gas the gas keeps the pump cool
In the gas tank In the gas tank In the gas tank In the gas tank In the gas tank