I just installed the majority of the upgrades listed in my sig. The fass however has been on there for some time. Never had this code until I installed the rest of the items. I am having a intermittent problem with the truck falling on its face for like 3 seconds then clearing up. It has done it twice in two days. I know my fass is working becuase it's one of the old loud ones and I can hear it pumping away.

 

P0628 Low Voltage Detected At The Fuel Lift Pump Relay

Check your wiring to make sure something is not loose. Maybe it got bumped or not set correctly with the install.

The other problem could be the FCA. Try your stock one and see if it changes.

 

OK tried my stock FCA its not that it popped the code again after I cleared it. I also have P1246 now which is Fuel injector group A supply voltage circuit open. This is starting to get frustrating!

 

Diagnosed the problem after chasing ghosts for two days. Injector wire was touching a rocker arm. Since we fixed it and cleared codes no issues.

 

recently my Dodge ram 3500 began to stagger while driving at about 40-50mph, but when going faster it stops. Then it started cutting out every 10 minutes while driving till it just wouldn't start. Code showed P0148. I Changed my lift pump (fuel transfer pump) and the truck began to drive again. Its been about a week and now the staggering is back and a little worse and i'm showing codes P0148 and now a new one P0628. Any ideas on what to do or how to fix this? the staggering seems to be getting worse.