72 chevy fuel gauge problem

[senrabdl]

Only one tank and it is stock,the gauge is pointing about at the 9:00 postion and then goes up to empty when the key is turned on and the tank is full. I will check for a short under the door sill tomorrow. The old gauge would go to full when I unplug the brown wire from the sending unit I have not tried that on this gauge yet.
Thanks for your help..

[Legolas894]

Originally Posted by senrabdl

Only one tank and it is stock,the gauge is pointing about at the 9:00 postion and then goes up to empty when the key is turned on and the tank is full. I will check for a short under the door sill tomorrow. The old gauge would go to full when I unplug the brown wire from the sending unit I have not tried that on this gauge yet.
Thanks for your help..

If you touch the sending unit wire to ground, the gauge will go to EMPTY. If it doesn't do that, the problem is somewhere before the sending unit. There's lots of posts on this if you search fuel gauge or something like that. If you take the sending unit out, you can check the resistance of it with a multimeter. They are usually 0-90 OHMs. As you move the float, check to see if the resistance is changing.

[senrabdl]

thanks for the suggestion I will check it out