Fuel line leak!
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No, the check valves screws into the tank with their O rings to the smaller top threaded channels, then you have the hose fitting that screws up against the bottom of them them using the larger threaded channel on the bottom of the tank.
As for trick if you are getting the hose fitting leaking since the upper check valve O rings are not sealing, use teflon tape on the hose fitting as your threading it into the tank. Hence had this problem as I was trying to find a tool to pull the check valves to replace their O rings, then finally just ground down the back end of a tea spoon handle to make a wide enough tool to pull the check valves to replace their O rings (crescent wrench on the flat of the tea spoon to give me the needed torque).
The down side, until you do get the check valves to seal, fuel pump is going to make a little more noise since the fuel is making it way back past the check valves.

Check valves that install in the tank upper threaded channels of the bungs first for supply and return ( match the flow of the fuel, so two different ones), before the hose fitting is threaded in below them in the bungs larger threads, and what the top of the hose connector seals off against.
Last edited by Dano523; Oct 18, 2020 at 08:18 AM.











