The fuel vapors are released into the carbon canister by the pressure built up in the tank from fuel & vapors, then the pcm closes the tank pressure solenoid and then opens the canister purge valve and pulls the vapors into the intake along with outside air thought the canister, but thier is never a vacuum on the tank, only pressure, I'm not sure if you would have enough venting, some of the 5/8 hoses have a roll over valve in side & just to vent while filling tank, check the hose real good..
2000 sil.ext. 5.3 / Lingenfelter Ls1 cam / LS1 valves / Ported / Milled / 35lb injectors / 80mm tb / E-fans / cold air intake / Pacesetter Cer LT's w/3"ory/ JET-DST / MSD Twister / Corvette Servo / 3.73's / 125 N2O / no cats / Flowmaster exhaust / level rear drop / Rear sway bar / SS wheels / 285/50R20 Goodyears / 05 Tail lites
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