GMC Weight

I just talked to my friend. He said a mechanic near where he hunts checked codes, found low fuel pressure. He removed the fuel filter and said it looks ok. He said he couldn't do any more than that, and said to take it to the dealer. That's where it is now. They (dealer) were told not to do anything because they were preparing to rape and pillage. They said they "thought" the injector pump was bad, and the injectors are bad. Now, my buddy and I may not ne diesel mechanics, but we're pretty sure injectors don't go bad all at once. They went on to tell him maybe he should cut his losses. He asked them what they'd give him for it and they told him it had no real value! Bye bye!!
What's the dealership called? Bend over we'll drive?