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4.1L V8

  1. Remove vacuum hose from inlet port. Install vacuum gauge to inlet port. Turn ignition on. After 10 seconds, gauge should read 21 in. Hg. If necessary, replace pump as an assembly.
  2. Connect a 0-20 ammeter in series to vacuum pump wiring. Block the pump intake. Operate vacuum pump and ensure current draw is less than 8 amps. If necessary, replace pump as a unit.
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