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Cummins/Onan — Fuel Pump Reconditioning

A Cummins/Onan service procedure — check it applies to your exact model before use.

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Before you start

  • Use care when reassembling and reinstalling the pump. Improper parts alignment or misconnected fuel lines may result in leaking fuel, creating a serious fire hazard

Procedure

  1. 1. Remove fuel lines and mounting screws holding
  2. 2. Make an indicating mark with a file across a point
  3. 3. Turn pump body over and remove vaive plate
  4. 4. Clean pump body thoroughly with solvent and a
  5. 5. Holding the pump cover with the diaphragm
  6. 6. Place pump body assembly in a clean place and
  7. 8. Clean mounting bracket with a solvent and a fine
  8. 9. Replace the diaphragm fuel pump rod spring,
  9. 10. Hold bracket, then place the pump cover on it
  10. 1. Remove vacuum and fuel lines. inspect lines for
  11. 2. Scribe two lines (one each on opposite ends of

Tools required

  • file
  • fine wire brush
  • solvent

Specs & torque values

  • valve gasket
  • valve springs
  • diaphragm gasket
  • diaphragm fuel pump rod spring
  • mounting gasket

Source: manual:927-0754 Onan CCK-CCKA-CCKB (Spec A-J) Engine Service Manual (03-1986).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.