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03-08-2024
Okay so im at my witts end with this problem. Got a 2005 grand prix gtp. Code p0446. I have replaced the purge solenoid, vent valve, filler neck, fuel pump, and vapor canister. I just took it to get a leak test done, leak found and sealed. STILL NO VENTING. We bypassed the vent valve, still no venting. I dont know where to look next.
03-12-2024
the charcoal canister might be messed up. the pellets come out and clog the vent lines.
if your having issues filling the tank, like it pumps for a bit then turns off the pump. 99% of the time its that canister.
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