Thanks for any help. New to this forum and have searched problem without any luck. 1966 Cherokee 140 has leaking fuel check valve under right wing. Tried a few times to drain fuel and flush with no luck - leak always comes back. Bought new Curtis valve and went to replace but seems old valve is locked in . Did not want to put too much pressure into it turning and rip valve creating bad tank, etc, etc . Assume to remove you turn counter clockwise as with most things? Assume you remove the valve "pin" (cross bar that you push fuel check glass against) and put on 7/16 ratchet socket to open. On torque wrench what would you consider too much pressure? What would you use to try to break free? What do I do next? Thanks for any help!!