I have a 96 del Sol Si, and the last 2 times I filled up my tank the gas gauge has not gone all the way to full, it's about 1/8 of the way under full.

Has anyone ever had this problem, or does anyone know how to fix this?

I'm assuming it may be the sensor in the tank, but I don't know how to check it, or fix it.

Any help would be appreciated!
Thanks