Jump to content

P0451 CEL


Recommended Posts

had this issue for months now, my boyfriend has scanned it, it goes on after a fill up then off after another fill up, we did buy a new gas cap but wondering if it has to be OEM Ford?

and the gas cap is cranked on correctly


tired of the damn CEL


thanks all

Edited by girlsedge
Link to comment
Share on other sites

Probably needs the purge valve/EVAP lines blown out, something is clogging them.



Could try an emissions-prep gas additive for the fuel tank to clear issues also like here:



Edited by WWWPerfA_ZN0W
Link to comment
Share on other sites

  • 1 year later...

The part number for the hose assembly with fuel tank pressure sensor is AT4Z9C047A. Labour was 2.2 hrs for repair.


Fuel tank was lowered to perform repair.


I was able to clear the codes and it would stay away for about 5-800 kms and then come back on.


I could not identify originally where the sensor was actually located. I checked the fuel pump assembly schematics and could not see it nor in the top of the tank were they normally are located. I used a boroscope to look around up there but could not identify it. Eventually realized it was an actual hose assembly, not an in tank sensor. Location meant lowering the fuel tank so I had the dealer do it. My truck has 180,000 on it so the ESP Premium warranty was up at 150,000 kms


I cleaned out the evap can vent line first, it did have a spider living in it so I at first thought voila, but no luck. Code came back.


Codes were P0451 and P1450 that the vehicle presented with. No drivability symptoms were noted.

Edited by Scott S
Link to comment
Share on other sites

  • 8 years later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...