To update if anyone is still following, Dustin and the guys at Engle continue to be awesome and I can't say enough nice things about them. They really keep their customers in the loop. Apparently there was an old PPE lift pump on there (which I had no idea the previous owner installed) that was internally shorted out. Ripping that out, and installing the FASS pump now. Can't wait to get the truck back and be done with the problems I've been dealing with for almost 4 years. Hopefully Dustin can come along and elaborate, as I am probably not explaining this very well.
Again, nothing but great things about Engle and chevyburnout1!!!
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