Idk if it is or not, supposedly its supposed to vent into the canister and then the evap purge solenoid is supposed to purge the canister. Maybe the solenoid isn't working and the canister is fouled and can't take anymore
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1993 BGGM Z28, stock LT1, T56, 175k on original motor, basic bolt-ons. 273 whp, 308wtq. SOLD 
2001 Black WS6 TA Stock....for now.... 
DD: 2007 Dodge Ram 1500 quad cab sport, 6 inch RCX lift, 35x13.5 tires, 20x9 Fuel wheels, 20% tint all the way around, ZZ customs exhaust, Diablosport Trinity T1000 programmer.
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