November 9, 201411 yr 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.
November 9, 201411 yr 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?
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