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Accelerator Pump

NOTE: Accelerator pump setting should not be changed from original factory setting unless measurement shows a variation from specification. Do not attempt to bend pump lever unless absolutely necessary as it is made of hardened steel and extremely difficult to bend.
  1. Close throttle valves completely. Make sure fast idle speed screw is off fast idle cam. See Fig 1.
    Fig 1: Adjusting Accelerator Pump
    G09337053Courtesy of GENERAL MOTORS COMPANY
  2. Using a "T" scale, measure accelerator pump specified distance from cast surface of air horn to top of pump stem.
  3. To adjust, remove pump lever screw and washer. Remove pump lever by rotating lever and removing from pump rod. Secure lever in a vise and bend end of lever at small segment.
  4. Install pump lever and tighten screw. Recheck specified distance. Open and close throttle and check for freedom of movement.