Rear tank pump was replaced got truck back switched to front died out checked switch a jumper wire installed on switch wrong replaced switch relay now have power to pump but guage is pinned and pump won't run bad pump?
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I have a 1996 f150 and I had the same problem. I finally found out that the rear fuel pump is the main pump, and if it goes out then the front pump will not work either. There is a groud that both pump share on the rear cross member. If you are not getting good connection with the ground the fuel pumps will not work. Also if you replace the rear pump and it still does not work then your problem could be the fuel tank selector switch, it acts as a relay if it goes out then neither pump will work.
If there is not a mechanical fuel pump on the side of the block it will have a pump in that tank on some fords you can get to the tank and check for power if it has a pump in the tank otherwise you have a vacuum leak in the line or the fuel tank filter is plugged. also and this is what I would check first is test the switch for it switching power from one side to the other and see if you here the switching valve shift over. I had to replace a few of them over the years. Normally it's the valve itself it gets junk in it and does not allow the valve to switch.
It definitely has something to do with the fuel flow from the front tank. It may be the fuel pump again, the older F-150's with two tanks soemtimes have problems with the fuel pumps because of the extra pull from two tanks, and the switching between them.
You could check the fuel filter (assuming there are two fuel filters, one for each tank)...but otherwise it sounds like a fuel pump problem, or possibly an obstruction in the switching mechanism for the two tanks, or an obstruction in the line itself. Hope that helps!
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