Have recently did a holley 500 carb swap on my 87 toyota p/u 22r during the swap i switched over to a electric fuelpump (one that goes outside of the tank) a few months later the pump burnt out so i switched back to the factory mechanical fuel pump and since then my fuel gauge will not do anything i know that i have at least 1/4 tank of gas i have pulled the sending unit and tryed lifting the arm manually and still nothing i have even put a new one in it and still will not read. The gauge worked perfectlly with the electric one and worked before i switched fuel pumps and i am completly stumped any advice would help a bunch

 

When you are manually lifting the arm is the key on,and are you grounding it to a good ground?

 

Whats been previously stated and to add it maybe the sending unit. In my 87 toyota...the gauge acts funny...i put 1/4 tanks it reads full or sometimes nothing. I haven't played with it. I just keep a gas can in the back of the bed and watch my mileage

 

Yes the key is on ive eve tested it with the truck running and all of the factory wiring is still being used for it i have not spliced or cut into any of it