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Air Pump

  1. Make sure injection pump belt tension is correct (about 1/2" of slack under thumb pressure). Disconnect air supply hose at check valve and insert the open pipe end of air pump test gauge adapter (special tool ST 19870000) into air supply hose.
  2. Clamp hose to adapter to prevent it from blowing out and place adapter and gauge so that air blast through drilled pipe plug will be discharged harmlessly.
  3. Install a tachometer on engine and check that air pressure is 0.63 psi or more at 1500 RPM.
  4. If air pressure not to specification, disconnect air supply hose at anti-backfire valve and plug hose opening. Clamp securely, and repeat pressure test.
  5. Check filter element. With engine speed at 1500 RPM, close hose of test gauge with a finger. If a leaking is heard or felt at relief valve, the relief valve should be replaced or repaired.
  6. If the air injection pump still does not operate properly, it should be replaced.
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