Fuel gauge doesn't work.

Pull the wire off fuel tank to the sender unit earth it out with ignition on.The fuel gauge should go to full slow even motion if it does replace unit in petrol tank.If it doest move you need new fuel gauge.Also before any of this i sumise you have checked fuse

Cathy, 1996 Mercury cougar gas gauge not working. Simplest thing to check first is your fuel gage fuse, make sure all fuses are good. The ground wire could be corroded/damaged, sending unit in tank faulty, fuel level gauge in cluster faulty. All things can be tested by a good Tech.,diagnosed and estimate for repair.
1994 Mercury Cougar gas gauge don work
Ford Gas Gauge Does Not Work Help Blue Springs Ford Parts Blog
Diagnose Fuel Gauge

If your fuel gauge isn't working , it's not a fuse ! The gauge or the sending unit in the fuel tank is bad . If you had other thing's not working in the instrument cluster I would say probably a fuse. There is not a fuse just for the fuel gauge . Fuel Gauge Tech How To Properly Diagnose Faulty Fuel Pump Sending Unit

had a ford that the wire on the fuel pump would hop off ,had to keep plugging it back in,also check your fuses.

The gauge In the dash is electronic and the gauge could be bad. My odometer doesn't work but seedo does found that its all electronic

Talking about fuel gauge issues and how do you how do you diagnose, ... is the dash unit right here, and obviously the gauge doesn't read correctly. ... to fix the fuel gauge, so you can actually fix the fuel gauge electronically by reflashing the program. ... How to Troubleshoot a Malibu Fuel Gauge & Dash Light Not Working ...Could be a bad fuse - fuse # 17 is a 15 amp fuse for the fuel gaugeCould be a bad float on the fuel gauge sending unit inside the gas tank ( it's with your electric fuel pump ) If the float gets a pinhole or crack in it , the float fills with gas and sinks so the gas guage reads empty all the time Could be a wiring problem

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.

Check Along the Frame on the Driver Side Beside the Fuel Tank For Terminal Connector..Check For Bad Connection ...Possibility Corrosion inside Connection if not Check inside Fuel Tank For Potentiometer Gauge Level defect... and Fuse Box for Fuel Gauge fuse ..good luck

could the float have filled with petrol ??

CHECK ENGINE LIGHT ON READS FUEL SENSOR
AND 5 CYLINDER