Preasure building up in my Gas tank (72)

[DjS71]

I popped a seam in the gas tank because some genius before me put some plugs in the canister lines and left everything connected for smog appearance. I bought the right gas cap because I didn't have a key to the one that was on there. Pressure.... pop. Gas in the cab. Its something I'll always check for in the future. So either go through the system, or get a vented cap. Just do either one soon, you don't want to have to pull your seat-> tank and get it repaired and soak up gas from the interior... I was fortunate enough just to have bare floors at the time.