CEL popped up Saturday on my way to work, pulled codes, it was Code 44 - Lean o2 again. Cleared codes and drove it yesterday and the CEL popped up. Pulled codes, Code 44. Also, I was well below 1/4 tank of gas, the truck barely wanted to run. Every time I took off from a stop it would bog down. I know letting it get that low is not advisable, however, it's never behaved his way the other times I've neglected to fill it up the night before. Filled her up and she ran much better. Anyway, today I finally had time to check fuel pressure.
Key ON/Engine OFF - 6 psi
Cranking - 6 psi
Idle - 9 psi
Running with Load - 9 psi
Key OFF/Engine OFF - 9 psi dropped to zero within 30 seconds (normal I think)
There was no change in pressure when pinching the return line ruling out the FPR. According to the service manual, I'm looking at an in tank issue (pump, hoses, clogged strainer), which is what I expected.
Now I get to decide whether to drop the tank or mess with tilting the bed. I'll probably go the bed route.