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I was taking the gas cap off yesterday at the gas station and a lot of positive pressure came out when I did. Is that right? It came out so hard I felt it on my face!!!
 

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Vent line from tank to charcoal canister in front may be blocked ,common
 

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What end should I start checking?
Disconnect vent line at tank and at charcoal canister and try to blow through.
If no go , check the rubber sections in wheel well behind drv seat that join the steel lines together.
Common for rust from steel lines over tank to drop down and block line at that point
Vent line runs with brake lines under floor on drv side of car but has above mentioned rubber lines
 
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