Yes. You should have a check valve "someplace" in the line to prevent it going to the tank. It may be the pump itself that's leaking back from the shore pressure. Do you have a shore pressure regulator in line? That could also cause the issue.

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Sep 17 at 05:33pm

Very common. The engine mounts obscure access to the fuel pump. I have the same on my boat, and every EFI/MPI boat I have worked on. The only option, and I know it's harsh, is to pull the engine... So yes, you want to be real sure it's a fuel pump problem before going there.


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