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P0455-New OEM fuel cap. Anything specific 2006 Hummer H3?Vortec 3500 I-5

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Is this likely the evap. vent solenoid?

Vehicle: 2006 Hummer H3, Vortec 3500 I-5

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P0455 EVAP large leak detected

More than likely you have TSB bulletin number 05-06--4-055.What this is is the fuel filler tube could be causing the fuel cap from sealing correctly,You should not have to replace the fuel cap, just make the seal flush with the filler cap

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