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Is it possible the fuel hoses are not hooked up right ? If you only changed the rear pump and the lines are correct, its possible the new pump damaged the check valve in the front pump. The valve could have been about to fail before replacing the rear pump.
You may be able to block the line going into the front tank and run the truck from just the rear tank.
Make sure all the wires to the fuel pump are hooked up. listen to see if you hear the pump turn on when you turn the key on. If it has two tank does it start on the other one. make sure you have it switched to the right tank. Check your fuel pump fuse and relay under the hood.
the pump is inside the fuel tank so you would have to take the tank out. My rear tanks fuel pump was struggling and after i replaced the fuel filter it was enough for it to keep working w/o me having to replace the pump.
The fuel pump is in the fuel tank. One in each tank. You'll end up having to drop the tank down to replace pump. A little time consuming, but not a big deal. I had a pump go out in my F150, but not until I just topped off tank. That was a pain.
your truck is a 4.9L, make sure you have power to the front tank fuel pump. is the power to the pump is ok and you can hear the pump run for a second or two when you key the vehicle on... replace the fuel tank selector valve