LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1998 >> Forward Control 5.7 R, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls - System & Component Testing - 6.5L Turbo Diesel) >> Emission Systems & Sub-Systems >> Vacuum Pump

Vacuum Pump

WARNING: This page is about a different variant/trim than selected.

Connect vacuum gauge to vacuum pump inlet (small fitting). DO NOT plug or disconnect outlet fitting. With engine idling, vacuum should be 18 in. Hg one minute after start. If not, check for belt slippage, vacuum leaks or other obvious defects. If no defects are present, replace vacuum pump.