i'll start by saying that i know very little about diesels and have never claimed to. so if some of my terms are incorrect, please be gentle. a family friend has a chev 3500 with the duramax and it is dumping fuel, literally all over the place! i crawled under to look and the tank and two lines from it to the motor look ok. it goes up above the motor across the intake-looks ok. the fuel filter is not leaking. it looks like a terrible rear main seal leak, but it is diesel. and it is also wet across the front crossmember and along the oilpan. the intake and around the exhaust manifolds are dry. i had him turn the key on while i was under to prime the fuel pump and hopefully spray somewhere, but nothing. is there something that i am missing? please help.