Isuzu Repair: Isuzu Rodeo, isuzu rodeo, gas gauge

Question
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? I'm afraid one day i'll be stranded someone.  Please help

Thank you kindly,
Noki Vongaraj

Answer
Have you used Shell gas lately. As long as you keep track of your mileage and gas you put in you won't run out of gas.
Have a mechanic look at your guage and replace it. if you use shell gas and have receipts, call them and they will replace it for you.
Thanks,
Derek