i recently put a fass 150 fuel sytem an electric fans on the truck an a smarty. now that i have the smarty i have codes that keep coming up its a low voltage at the lift pump and cooling fan 1 speed an cooling fan 1 curcut code is there any way i can get them to stop showing up? also when they are present i dont get an engine light i get dining an the preheat light comes on an stays on. any help would be great

 

The fan ones will always be there since the fan clutch isnt plugged in, i have them on my truck also. I dont get the grid light or a dining so it must be from your Fass system. How did you wire the Fass system in?

 

we had t into another wire for power cause the truck didnt have the in tank pump. wired just how they said on the fass website. i wanna say it was something like an m11 harness i cant remember

 

What is the code number for the lift pump code.

 

p0628

 

Sounds like the computer is mad that the factory lift pump is not running, id ask the vendor you got the system from if you can jump a wire on the factory harness to make the computer think the pump is running.