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Home >> GMC >> 1983 >> Forward Control 5.7 M, Automatic, 475/M40 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Adjustment >> Tune-Up - 6.2L V8 Diesel VIN [C] >> Vacuum Pump >> Gear-Driven Mechanical Pump >> Diagnosis & Testing

Diagnosis & Testing

Install hose and vacuum gauge to pump. With engine running read gauge. Shut off engine, vacuum level should not drop below 19 in. Hg in less than 1.5 seconds.

VACUUM PUMP SPECIFICATIONS

Application Engine Running Engine Off
All Models 20 in. Hg (1) 19 in. Hg
(1) Minimum reading after 1.5 seconds.
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