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Yes if the vent is sticking it will pressurize the tank BUT the pcm would see the ftp staying high and kick the mil on. I had an older Tahoe the other day doing the same thing and the smaller vent hose between the tank and filler had come apart internally and stopped the orvr valve up. The old school hoses don't like the ethanol gas. Unless your are getting some evap codes I would say it's filler or tank related
