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Home >> Mercedes Benz >> 1968 >> 280SL Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> MERCEDES-BENZ Air Injection >> Operation >> Back Pressure Valve
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Back Pressure Valve

The back pressure valve prevents hot gases from entering into the air line system and the air pump. It is in operation when the air pump is not functioning or when the pressure control valve is defective.