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Home›Repair guides›Cummins/Onan›Fuel Pump Removal and Repair

Cummins/Onan 4MCCK / 605MCCK — Fuel Pump Removal and Repair

Repair & overhaul

For the Cummins/Onan 4MCCK / 605MCCK, from the Cummins/Onan service manual.

Applies to: Cummins/Onan 605MCCK, Cummins/Onan MCCK, Cummins/Onan MCCK engine

Before you start

  • Do not pry the cover and body apart; it will damage the diaphragm.

Procedure

  1. Remove the pump inlet, outlet and the two cap screws holding the pump to the engine.
  2. Notch the pump cover and body with a file so they can be assembled in the same relative position.
  3. Remove the screws holding the cover and body together.
  4. Tap the body with a screwdriver to separate the two parts.
  5. Remove the screws holding the valve plate to the cover and lift out the valve and cage assemblies.
  6. Drive out the rocker arm hinge pin.
  7. Remove the rocker arm, spring and link.
  8. Lift out the diaphragm assembly and spring.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Full service-parts list: Cummins/Onan 605MCCK →, Cummins/Onan MCCK →

Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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