Just thought I'd share that the cap below, though not listed for Chevy/GMC, fit perfectly in my Suburban Duramax. Feels better knowing my wife will always see this when she goes to fill up.
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+1.Does it affect any potential venting issues by sealing it?
the tank opening isn't at the neck flap, not gonna cause an issue to put a cap on it+1.
Seals what GM did not. No thanks.