Ford Repair Questions? Ask a Mechanic for Answers ASAP
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Ron,Did you replace the complete assembly?
The common cause for this type of problem is in most cases a failing check valve in the pump. Each fuel pump contains a check valve on its high pressure supply outlet port and a shuttle valve on its return inlet port. When the front pump is not running, the shuttle valve and check valves are designed such that they should block flow of fuel into the front fuel tank. When the front pump is running, the shuttle valve opens and allows fuel to flow into the tank. The function of the rear in-tank fuel pump is identical to the front in-tank pump. In order to determine if you have a defective fuel pump your going to need to do a little testing. See the steps to do this in the link below.https://dl.dropboxusercontent.com/u/104923897/Fuel%20tank%20Nov%2023.pdf