Fuel gauge: works but shows lower than real??

[PetzK]

Hi,

I tried a search because back in the days there were lots of questions about the AE86 fuel gauge, but I couldnt find anything...

Here's the deal: when I fill up to top, my fuel gauge will only go up to 3/4, I know that it takes time to go up, but it wont go past 3/4 of the scale...

Then it goes down and when the gauge shows empty, I fill up like 30 liters, and the warning light doesn't come on....

The car has been fully rebuilt and therefore been sitting for the last 4 years, I cant remember that the gauge wasnt working before, is it the sender that is shot? Or is the gauge itself shot? or might there be a resistance at some connection causing the gauge to show lower than it should?

Thanks a lot
Patrick