All,

Does anyone have a good youtube link or other tutorial showing the best way to fix these codes? I know it is an Evap System Leak (Large Leak) and I have already cleaned my capless gas tank inlet and it seems to have helped for some time (3 months or so) but I am getting the reading again. I have seen conflicting messages on what to replace to resolve this. I may try cleaning the cap again but I figured the parts to replace under the hood aren't too expensive so I could replace them as well.

I have a 2017 F150 3.5L V6. Another recommended forum would be great too.

Thanks!

 

If you look up the codes, you will see they are almost the same.
Since it s saying a large leak, pick the cause that best fits the overall report.
>Valve stuck open<, Hose connection, open tank vent etc.
With a dozen possible causes, you have to run the cause down.
There is no easy one time way to tell.
Good luck.

 

P144C - Evaporative Emission System Purge Check Valve Performance Description: The EVAP check valve test is performed during minimal boost conditions, once per drive cycle, when entry conditions are met.
This DTC sets when the fuel tank pressure exceeds a calibrated amount within a specified amount of time during the test.
Possible Causes: • Restricted EVAP ejector connections at the intake air system • Stuck open EVAP check valve • Stuck closed EVAP check valve • Damaged EVAP ejector • Damaged EVAP check valve