Low fuel rail pressure, need help diagnosing
I started off with a p1093 code thought it was the fuel filter on my fass. I replaced the fuel filter with the same one a racor R90s. That did not solve anything. I then replaced the whole filter housing and then put on a car fuel filter with the adapter, still didn’t fix the pressure. When I first start the truck all the injectors are in spec at #1 -1.3 #2 1.7 #3 -.08 #4 1.8 #5 -0.4
#6 0 #7 -1.8 #8 0.9 this is at 96 ECT at that temperature I did the return flow test and unplugged the return line on the cooler unplugged my fass and cranked it over for 15 seconds I got about 90ml. I then drove the truck around until it got to 138 ECT and these are the balance rates #1 -1.0 #2 4.6 #3 2.3 #4 1.5 #5 -0.5 #6 1.9 #7 -5.1 #8 -3.0 all these number are in park. I then unplugged the fass and return line and measured the fuel. It was at 50ml then I tried it with the fass plugged in and it was at 170ml. Stock tune, no smoking at idle or driving. I don’t know what to do.