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Hello. My name is Tan.
The fuel pump does not have a check valve. But the boat has a check valve at the fuel tank where the fuel supply line connects. This is called an anti siphon valve.
What seems to be your issue?
Ok remove the fuel supply line at the fuel tank and unscrew the barbed fitting the hose connected to. Look inside the fitting you should see a check ball. The valve should only allow fuel to flow one way.
OK. Let me know what you find.