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Home›Repair guides›Pulsating Diaphragm Fuel Pump Servicing

Cummins/Onan — Pulsating Diaphragm Fuel Pump Servicing

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 vacuum and fuel lines. inspect lines for
  2. 2. Scribe two lines (one each on opposite ends of
  3. 3. Remove fuel pump attaching screws.
  4. 4. Holding pump, carefully pull sections of the pump
  5. 5. Check parts for wear and damage. Replace with
  6. 6. The air bleed hole in pump base must be unclogg-
  7. 7. Replace gaskets and reassemble pump as shown
  8. 8. install pump and replace lines. Make sure fuei line

Specs & torque values

  • new gaskets
  • repair kit

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.