82 Jaguar XJ6 has pressure in right tank left tank overflows is the fuel tank solenoid bad and how do you test it?

If the left fuel tank is overflowing while there is pressure in the right tank, it could indicate a malfunctioning fuel tank solenoid or an issue with the fuel transfer system. To test the solenoid, first, check for power at the solenoid connector while the ignition is on; it should receive voltage when activated. You can also manually activate the solenoid to see if it opens and allows fuel to transfer. If it does not operate correctly, it may need to be replaced.