Gas gauge stopped working yesterday…what to check first? (1 Viewer)

[danmc00]

Gas gauge stopped working in my 1978 FJ40 today. What‘s the first thing to check? I have roughly half a tank currently.

 

[1969FJ]

First the fuse. Second the ground and connector to sending unit. Then the sending unit , best way is to attach DVM and see if there is the correct ohms as the sender is exercised. Something will lead somewhere.

 

[TheHardWay]

My 78 gauge went whacko one day after I had filled the tank and got accurate gauge readings until the gauge reached 1/2, then it dropped to empty and stayed there until refilled. Pulled the sender and found the copper wire wrapping had come apart. Put in a new sender and VOILA - has worked perfectly since.