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Home›Repair guides›Cummins/Onan›Disassemble Fuel Transfer Pump

Cummins/Onan DJ30 — Disassemble Fuel Transfer Pump

Repair & overhaul

For the Cummins/Onan DJ30, from the Cummins/Onan service manual.

Applies to: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T, Cummins/Onan DJA engine

Before you start

  • Do not pry the body apart; this would damage the diaphragm

Procedure

  1. Remove pump inlet and outlet lines and the two cap screws; lift the pump off.
  2. Notch the pump cover and body with a file for correct reassembly.
  3. Remove the six screws and tap the body with a screwdriver to separate.
  4. Lift out the diaphragm assembly and diaphragm spring.

Tools required

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

Full service-parts list: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T →

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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