Low fuel pressure

[Blown 330]

I have just started to notice that lately my truck is loosing fuel pressure while it idles in park or neutral and has warmed up. It drops to around 25-30 PSI, but goes right back up to 38-40 PSI when I start driving. I also noticed that with just key on ignition off I will only see about 25-30 PSI. I decided to check for codes even tho the CEL never came on and I saw codes P0171 and P0174 which I know mean bank 1 and 2 are running lean.

Does this mean its time for some new fuel pumps?

And what is a good replacement or should I just stick with the walbro 255s that are in there now?

 

[Fade 2 Black]

How old is your fuel filter? Pump output pressure should be checked with the engine running and the vacuum reference line removed from the regulator, should be ~40 psi and then with the relay jumped should be 50.

 

[Dusten]

possible crack in plastic y?