I have swapped out all the relays with another truck of the same that my father has, and they all work. i did however, even though it was very risky used ether in it to see if it would run. It did want to run, but did not have the fuel to support it. Everything from the fuel tank to the fuel filter is working. I have come to think that it is either the HPOP or the injectors them selfes. my question is, which one of these would be the first to typically let go? If i am not right about this, what else could it be?