Fuel guage fluctuates truck seems to lack fuel and sputters

prime it,
Fuel Priming Ford F250 F350 7 3L Powerstroke Diesel
Ford IDI Diesel Starting problems Diagnosis

You would need to figure out if the problem is too much air or not enough fuel.
The carb has three internal circuits - - idle, cruise, and accelerate.
Fuel flows thru each circuit from the bowl to the venturi.
You could have a vac leak that is allowing too much air to enter the intake, or the idle circuit on the carb may not be adjusted correctly after the engine warms up.
Or it could be something else.

check a site called "aboutautomobile.com or aboutautomobiles.com" Enter your year, make, etc. and get results for technical service problems, complaints, and resolutions. This will show you if there is a common problem.

volt meter, fuel gauge, oil pressure and coolant temp all share the same power and ground

the circuit you want to check is the yellow and white wire from the dash to the dual switch

There is a recall that solved my electrical problems for the Spd/Od/Radio.

Power steering is totally different.

Your feuel problem sounds like a filter.

Yes that is possible. Did you try and hook up lines together that go into the valve to see if it would run. Also check to see if there is fuel to injectors.

youll think im crazy but change the oil and look for a oil leak, prob around the fuel filter

replace your forward in-tank fuel filter

Sounds like the rear fuel pump in the tank is not working and the float or sender is bad also. check to see if the rear pump is working should make a humming noise.