Fixed my Codes P0171, and P0174
probably not for everybody but this fixed mine.
reach in deep.
my fingers are on it!
with the motor running you'll be able to feel the suction coming thru this crack.
replace the rubber tube piece with part from dealer or what i did is found some heater hose that was the same internal diameter and cut it a little bit longer (because the heater hose is stiffer it's harder to fit) and install.
heater hose has only been on about a month and it's doing fine, when/if it does fail I'll update.