So on my way back from seeing my family my ejwa said i had 0 fuel pressure. pulled over checked codes, got p0230 and 1693.... after a bunch of headaches i got to messing around and my lift pump loses power once the code becomes active. if i clear it the lift pump has power till it activates again. pretty confused on this so any help will be appreciatated. at idle my lp has 13.25 volts, is that too high?

 

i had kinda the same problem!!! my lift pump would say low voltage and i messed with it for weeks then my starter when out and i put a new one in it started then died. The lift pump shut off so i was messing around with the battery cables and grounds on the pass side battery and found the ground wire that plugs in had a bad connector on the neg. post replaced been good since. maybe its something to check?

 

i tested the grounds and they were good, ive checked the whole wiring harness for my airdog. guess this weekend i'll test the truck wiring, or maybe the ecm is bad? not sure but annoyed by it all

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working on it more my power line from the ecm will lose power, the one that goes to the fuel pump relay to engage the lp. hopefully a lose connection or corrosion.