I recently ran my front fuel tank empty, switched to rear tank and kept driving. When I refueled and switched back to the front tank the van would not run, no fuel. I replaced the in tank fuel pump. still will not run on the front tank, runs fine on the back tank. It's a 1990 E250 with the 351 engine. six port change over valve. The fuel gague in the front tank works, but the van will not run. There does not appear to be any wires going to the valve. any help.
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