I have a '99 Isuzu Rodeo that I bought only a year ago. It has about 77,000 miles and for the past couple of months my gas tank or gauge is acting up. I can put $20.00 in the tank for full and as I'm pulling out, my gas gauge starts to drop, however, it does come back up, but only to drop back down.Can you please tell me what's wrong with my truck?

 

your sensor is defunking out.