girlsedge Posted October 31, 2014 Report Share Posted October 31, 2014 (edited) 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 October 31, 2014 by girlsedge Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted November 1, 2014 Report Share Posted November 1, 2014 (edited) Probably needs the purge valve/EVAP lines blown out, something is clogging them. http://repairpal.com/OBD-II-Code-P0451 Could try an emissions-prep gas additive for the fuel tank to clear issues also like here: http://www.ford-trucks.com/forums/628998-code-p0451-evap-emission-control-system.html http://www.amazon.com/CRC-05063-Guaranteed-Emissions-Formula/dp/B000CIPUR8/ Edited November 1, 2014 by WWWPerfA_ZN0W Quote Link to comment Share on other sites More sharing options...
Scott S Posted November 4, 2015 Report Share Posted November 4, 2015 (edited) I had the same issue, turned out to be an assembly hose at the fuel tank. The sensor is built into it. Had dealer replace it once I figured it out as the tank had to be dropped down. Edited November 4, 2015 by Scott S 1 Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted November 4, 2015 Report Share Posted November 4, 2015 Do you happen to have a part number for that assembly, Scott? TIA. Quote Link to comment Share on other sites More sharing options...
Scott S Posted November 5, 2015 Report Share Posted November 5, 2015 (edited) 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 November 6, 2015 by Scott S Quote Link to comment Share on other sites More sharing options...
Scott S Posted November 6, 2015 Report Share Posted November 6, 2015 Part is 9C047 in the callout in this diagram. 1 Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted November 6, 2015 Report Share Posted November 6, 2015 Great info! Thank you Quote Link to comment Share on other sites More sharing options...
Jared4454 Posted January 2 Report Share Posted January 2 Same issue on my 2011 sport. Part #BT4Z-9D667-A The sensor is in the line. There's a dorman replacement kit but it's the same price so I go factory. Quote Link to comment Share on other sites More sharing options...
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