Removed the balloon from the fuel tank vent and installed some plastic tubing to try the manometer test. Secured the tubing to a piece of 1/4” aluminum tubing with a couple safety wires. Pressurized the tank to get the 27” difference between the water line inlet and outlet. Still getting leaks around the fuel cap so ordered some 3” wide packing tape to try and get the entire cap covered with one piece of tape. To be cont'd.