Quote:
Originally Posted by HotZ28
If the O-ring does not seal, you will get a P0440 DTC.  Check the simple things first, but anytime the pump is replaced, a new O-ring should be installed. Very common mistake that will come back to haunt you! 
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I just double checked the wire harness, everything looks fine, I also looked for the purge hose ; I am not sure which one that is?? Could you give me some direction?BTW the pump assembly came with a new o-ring and it was used(and greased); the pump went in good and tight.