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I'm wondering if this thread is similar to my issue. Car starts, idles, and drives with no issues. At speeds above 50mph, I get a loud howling noise from the fuel filler area. I replaced the gas cap and no difference. I am repeatedly getting the P0445 (large evap leak) code whenever I give above ~50% throttle when the fuel tank drops below 3/4 of a tank.
Not sure if the plan of attack here should be replacing the purge control valve and charcoal canister at the same time. Or do the charcoal canister first.
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