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i have an 04 silverado 1500 it appears my gas tank vent solenoid is stuck closed..i put a brand new one on and still cant put gas in the truck but if i go under truck and unplug the solenoid it fills fine any idea on why this is hapening..thanks in advance
 

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You probably did but I have to ask anyways, did you check for power to the solenoid? Maybe your problem is a fuse or broken wire - bad ground... I've had to clean up some grounds on my 04.
 

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if you over fill the gas tank to the max then the vapor canister will plug up the venting system.
the charcoal will break down and the material causes this and codes that the PCM vacuum is too high ..
inspect the canister venting lines for any debris ..
 
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