Wacked Out Gas Gauge

Over the last couple months, my gas gauge ('98 Passport) has been acting weird . . . sometimes when I fill my tank, the gauge only registers 1/2 to 3/4 full. Even though I know it's really full. I have tried different pumps thinking that maybe there was just a problem with the "cut off" to stop overflow, but it doesn't seem to matter where I fill up. Sometimes the gauge works fine and shows the tank is topped off.

Has anyone else ever experienced this?

:screwy:

http://isuzufaq.ibctech.ca/#faq2

100's if not 1000's for folks have the same issue.

On my 2001 model it was covered under warranty. Not sure how good the
'98's warranty is, but the '00 and '01 is tops.

98 and 99 were 5 year 60k.

Thanks, guys . . . I actually did have 10yr 100k warranty, but I'm long past 100k. I'll look into the sending unit!