Fuel tank 1994 ford f150 change rear fuel tank after changeing tank the front pump does't work and it put fuel in the rear tank, fuel gage go to empty when key is on. turn key off than fuel gage works.
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Check the wire and be sure it is not grounding out. If it is all good then the sending unit in the gas tank needs to be replace. The unit is on the side of the fuel pump mounting bracket in the tank.
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.
when i had my 91 ford, the front tank gauge woul not work, but the back one did. i discovered that the wire plug on top of the tank had deteriorated and losing connection. if you change that, it may help it start working again.
common on older high mileage fors to either have the switch go out or the intank pump go bad, you cang ground terminal 6 on the underhood diag plug with key on engine off and switch from front to rear or vice versa and listen for fuel pumps to be running, likely one is not
tank switch on dash could be bad, also selector valve could be bad. are the fuel gauges accurate front or rear. like you say the rear reads full, is it?? I would try the switch on the dash first.
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
first go to the fuel pumps electrical connections, switch the dash to the front tank and measure power, then to the rear tank, do you have power at both fuel pumps? if so the rear tank pump is bad
check the vent and return line pipes for a clog, it sounds like all return fuel is going to one tank.
Your truck is fuel injected. On the fuel delivery rail in the engine compartment there is a cap you can take off to check for fuel pressure. Hook a mechanical gage to it and check to make sure the fuel pump is working. Also if you have a dash switch to change over to the different tanks check it. Often these switches become bad and the fuel will not flow. The switches are about $ 40.00 dollars. To replace the fuel pumps you must drop the fuel tanks and remove each fuel pump from the tank. The cost for the pumps alone will be about $300.00 to $ 500.00 depending on who you purchase them from. The universals are cheaper, but the Ford pumps are an exact match and you can change them with out any problems.
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