P0440 & P0446 Codes

2000 PONTIAC MONTANA
260,000 MILES • 3.4L • AUTOMATIC
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GARAGEMAN402
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The fuel pump on this vehicle has been replaced twice, so the fuel tank has been on & off twice. We have replaced the Canister, Canister Purge Valve, Canister Vent Valve, Gas Cap, still get these codes. I have filled the gas tank up to the brim (3 gallons after it clicks off) in hopes of finding a liquid leak, no leaks. The tank does fill up the last 3 gallons a lot easier now without bubbling up & going down, as if air is getting out. Hot engine restart dies unless throttle is pressed. Any thoughts?
Jun 6, 2026 at 1:08 PM
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