•  MrShift@Edmunds 01/01/08 3:11 pm PST Edit Answer (for another -36 minute) It's a solenoid under the truck, but I can't recall the exact location. You'll see it I think in-line with the connecting line between the two tanks. Not sure if your truck uses TWO fuel pumps, one inside each tank? If so, one of those could be bad. Sorry, don't have the manual for your truck so these are general ideas.