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Home >> Pontiac >> 1987 >> Firebird Formula, 5.0 F >> Repair and Diagnosis >> Body & Frame >> Vacuum Pumps/Vacuum Operated Accessories >> Testing >> Electrically-Operated Pumps >> Pump Runs Continuously

Pump Runs Continuously

  1. Check all attaching hoses for leaks. Repair as required. With ignition off, remove inlet hose from pump and connect hand vacuum pump to inlet. Turn ignition on. If pump continues to run with 10 in. Hg applied, replace controller.
  2. If pump shuts off when vacuum reaches 10-15 in. Hg, drop vacuum back to less than 10 in. Hg. Pump should run until vacuum reaches 10 in. Hg, then shut off after 5-10 seconds.
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