Best bet in any fuel tank leak is to have the tank replaced
probably a fuel leak somewhere .
For a gas leak a person needs to check the gas line, along with a few other things. They need to check the seals, the pumps, and the fuel filter, to see where it is coming from, and then replace the part.
Fuel leak? Charcoal canister?
The fuel pump diaphragm has broken. Needs new fuel pump.
There may be a fuel leak. This may be serious. Many fires have started because of fuel leaks. Have this vehicle checked for fuel leaks.
fuel pressure regulator
Fuel leak? Defective carbon canister?
Heater core?
Either the "O" rings are bad where the injectors go into the cylinder head or the electrical connector on the injector is leaking.
Bad air filter? Fuel Leak? Plugged converter? Tune-up?
Coolant leak.
Where is the leak from? The fuel filler? The fuel tank? A fuel line? Does the leak occur only when the engine is running? Does the leak only occur when the vehicle is parked on an inclined surface?