Decided to leak test the tank today. Clamped a 10 ft hose to the vent tube. Installed a cap over the fuel line and installed Van's valve in the tank drain hole. Pored water into the tube and pressurized the tank to 1 pound. immediate leak from the fuel filler cap. After several tries I was able to get the tape to seal properly. After 1 hour the water level actually went up 1 inch with a slight rise in the air temp. Good to go....TANKS DONE!!!!!