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Hummer
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2010
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H3 Base, Standard
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Repair and Diagnosis (Single Page)
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Engine Performance
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Engine Controls And Fuel - 3.7L - Description And Operation
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Description and Operation
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Evaporative Emission Control System Description
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EVAP System Components
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Fuel Fill Pipe Check Valve
Fuel Fill Pipe Check Valve
The check valve on the fuel fill pipe is there to prevent spit-back during refueling.