Well posted the other day about a p1093 on a lly an a guy give me a lot of helpful info. Thanks a lot. So I put a race valve in had the same problem so I did the bottle test with the pressure rised with scanner an had no fuel in bottle. So then I hooked up a another mass pump I had to a 5 gal can an hook it to fuel line bypassing factory filter got the same thing only builds 85mpa commanded at 160mpa. So I am thinking injectors r returning or worn out crap truck got 220,000 miles on. Lol.