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Home >> GMC >> 1987 >> Forward Control 6.2 J, Automatic, 475/M40 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Fuel Injection System - 6.2L Diesel >> Operation >> Vacuum Pump
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Vacuum Pump

Vacuum to operate accessory systems on diesel vehicles is provided by a vacuum pump which is located at the rear of the block and driven by the cam. The engine should never be operated without the vacuum pump in place, as it is also the oil pump drive.

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