Fuel Check Valve
Disconnect hoses. Blow air through valve at fuel tank inlet port. There should be significant resistance. Repeat on engine inlet side of valve. Air should flow freely through valve. If air doesn't flow freely, replace check valve.
Disconnect hoses. Blow air through valve at fuel tank inlet port. There should be significant resistance. Repeat on engine inlet side of valve. Air should flow freely through valve. If air doesn't flow freely, replace check valve.