I have had a PO446 code for along time last week the truck would crank but not start and then when it did it was rough running so I took it in to the shop and they replaced fuel vapor storage can, vapor can purge solenoid, and vapor can vent solenoid. So today I get in it and PO446 is back what else can it be causing this code?

 

Well I'm thinking it may be the fuel pressure sensor after watching a video from GoTech on youtube that truck was giving a PO446 but the wasn't dropping low enough to flash a FPS code and the system said it was pressurizing the tank when it wasn't. I may change the FPS out Saturday.

 

I unbolted the bed and raised the driver side up and changed it out that way which seemed better than dropping the fuel tank cleared the code and wait and see.

 

Code has not came back so I think we are good.