Hello to all excuse for the spelling I am french my vehicle is a pontiac formula 350 of 1989 my fuel gauge remains blocked up all the time somebody among you has already had this breakdown? Thank you in advance for your assistance .

 

Your car is not carbureted (??), so this is probably the wrong section.

The fuel level sending unit is on the assembly in the tank. The issue could be fuel level sending unit, or wiring. Make sure the plug is clean (electrical cleaner), it could just be dirty. Plug is under the rear of the car, middle, behind the fuel tank. Can't miss it above the rear wheels.

Circled in red (his tank is out). That is not me, haha.