dkleiman Posted November 2, 2014 Share Posted November 2, 2014 Can a small crack in this make the check engine light come on? Link to comment Share on other sites More sharing options...
Legacy777 Posted November 9, 2014 Share Posted November 9, 2014 Welcome to the USMB. What year and model is this for? To answer your question, no I don't believe a crack in that valve would cause a CEL. Link to comment Share on other sites More sharing options...
porcupine73 Posted November 9, 2014 Share Posted November 9, 2014 At least on the '90's and I assume others are similar, it's just a piece of plastic completely inside the fuel filler tube. So even if it's cracked I don't see that iin itself causing any codes. There's hundreds of reason the CEL/MIL could be on. If I were guessing you are getting P0440? Link to comment Share on other sites More sharing options...
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