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You definitely have two different issues as the fuel gauge and radio are on different circuits. The radio could be a blown fuse, which would require finding a short circuit. The fuel gauge could be as simple as a bad connection at the sending unit or a lost ground on the fuel tank. Disconnect the fuel gauge at the tank and with a twelve volt test light well grounded probe the harness terminals with the key on (engine off). The fuel gauge should move when the sending unit wire is probed, and the test light should light dimly. Other terminals are a ground for the sending unit, a ground for the fuel pump, and power for the fuel pump. If the gauge moves when the sending unit wire is probed the problem is either the sending unit or a bad harness connection. If the gauge doesn't move during the probe there is a wiring problem (open circuit) or a bad dash gauge. Hope this helps.
It sounds like a problem with the fuel gauge sender unit in the fuel tank which has worn out and gone open circuit and needs replacing. Access to the unit is usually through a removable plate in the floor in the rear of the vehicle. Disconnect the wiring connector and any hoses and then remove the securing screws. Replacement is done by reversing procedure.
The fuel pump is in the tank. You'll have to jack the car up in the air and remove the straps that hold the tank up under the truck. Use a floor jack with a block of wood to lower it down slowly. While lowering it, watch for any wiring and hoses. When the tank is low enough, disconnect the wiring harness and slide the tank out from under the truck. Inspect the wiring harness that plugs into the top of the tank and look to see if the plug is melted. If it is, replace it. You can get the harness from the dealer or NAPA. With the tank out, unscrew the lock ring using a brass punch and small hammer. When the ring is off, simply lift up on the fuel pump assembly and installation is the reverse of removal. When you buy a fuel pump for the car, it'll be what they call a fuel pump module. It'll have the fuel pump and the sending unit for the gauge.
Check the ground wire at the wiring harness at the fuel tank. If it has a good connection then check the power wires to the tank. You may have a bad pigtail going to the tank. A replacement harness is available at NAPA.
Most likely it's not a pick up issue since the fuel sending unit is right to the bottom of the tank. It's going to be and electrical or the float in the sending unit is bent and is giving a fault's reading of 1/4 of tank when the tank is actually empty. It's common for the float to the sending unit to get knocked out of alignment if the unit is knocked around to much when installed in the gas tank and or wire harness has not been replace from the sending unit to the frame of the car which is only around $15.00. Fill the gas tank a few time to the top may realign the float and give you a more accurate reading. Good luck and hope this helps.
It sounds to me like you have a short in your wiring harness at you fuel tank. there is a plug on top of your fuel tank that controls you fuel pump and your sending unit that tells you how much fuel is in the tank. This plug can be a real p.i.a to get to on some vehicles, you may have to take the vehicle to a shop to fix it, if you are not mechanically inclined.