Still getting P0172

Question

Clean intake,new air filter,cleaned TB,ran injection cleaner and replace 02 bank 1. Still pops code? Any ideas? Truck runs great...help!
Thanks in advance! cheers!

Answer 1

Mechanical condition has to be ruled out, Most running rich condition are mechanical problem that create a rich running condition, such as low compression,  leaking fuel pressure regulator should also be checked.