Yes, if you can't get to the pressure line to disconnect the line at the check valve and relieve the pressure, use a fuel dot between the check valve and tank. You need to pull the line off between the check valve and tank to let the pressure off....pulling it off at the engine won't do anything. Another fuel dot in the fuel line between the tank and engine will let you fuel without pulling that line off. I run a filter between the engine and check valve to keep anything from the engine from getting in the check valve, and a filter between the tank and engine to keep anything from the tank from getting into the engine.