This is a follow up for those who have followed the saga of the stinky truck! GMCSID, you were right on! They put a die in the fuel tank, used a black light, pressured it up and found a leak in the high pressure line. They checked the whole system and found a small leak in the fuel line from the tank, also! Thanks, for your help! Its nasty when both ends stink! (smile) Dan in Minn !