Lean after fuel pump install
 

I installed a walbro pump and replaced and moved the fuel filter to the engine bay using the K&N filter. I checked for leaks and didnt find any. My problem is when I get on it my PMS tells me I am running .64 O2. I let off immediatly. just wondering why I would be running lean after I installed these parts. What fuel pressure should I being seeing under WOT, idle, and partial throttle? please let me know.

Shawn
'93 SSM Base

Mods: Streetport, N-Tech FAIS, Pettit dowmpipe, Apex'i Gt, EFI PMS, Walbro Pump, K&N fuel filter