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If fuel is draining from the rear tank to the front, there is a tank shuttle valve located on the drivers side frame rail that is the most likely suspect to fix that.
It costs around $120 or so, and when it fails, you get that siphoning going on, and often the front tank wont pump at all.
In your case, if the engine is running rough off the front tank, you might have another issue, such as a bad in tank fuel pump, but the shuttle valve needs changed first , so maybe it might fix the other problem too!
the fuel gauge should not be replace as it should be only one for both tanks when you switch tank selector the wiring also switches so you get reading from the tank you are using .now to replace the fuel pump you have to drop the fuel tank, some people say its easier to remove the bed but i disagree. hope this helps you
if neither tank is working check the selector switch it is responsible for energizing both fuel pumps depending on the selection, if you have power to switch and power leaving switch than either its lost on the way to the fuel pump or the pump is bad in this case both?to confirm you must check for power at the pump, easiest is the front tank.
There is no selector valve on a 1995 ford f150 300 engine. The selector switch on the dash sends power to the pump in the selected tank. The pump then sends fuel to the engine. If engine won't run on the selected switch, the pump in that tank needs replaced.
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.