Not sure what year or model your vehicle is but the filler neck could be rusted thru.
you fill gas in it
The tank is not venting properly.
no because if your tank leaks it is wrecked
gettin the gas in
Filler neck to the gas tank
you put gas in at the top, and it hold it until it leaks or until it pumps it to the engine
Check your fuel cap or gas tank for leaks, or maybe the gas lines.
Fuel system cleaner should be added to your tank before filling up with gas.
Gas will bubble back when filling the tank if the gas is going in too fast. In most filler tubes for newer vehicles, there is a mechanism that prevents siphoning. If the gas gets trapped in this mechanism, it cannot handle the volume and it might spit some of it back.
Make sure the tank "vent" is not kinked or blocked.
To fill a scuba tank with air, you connect it to a high-pressure air compressor specifically designed for scuba tanks. The compressor compresses ambient air and sends it into the tank through a filling hose. It's important to ensure the tank is properly inspected and in good condition before filling, and the filling process should be done by a trained professional to ensure safety and compliance with regulations. After filling, the tank should be checked for leaks and pressure before use.
toxic