Cummins/Onan QST30 / QST30 G-Drive — Fuel Pump Removal (Coupling Drive)

Repair & overhaul · Injection Pump

For the Cummins/Onan QST30 / QST30 G-Drive, from the Cummins/Onan service manual.

Applies to: Cummins/Onan QST30, Cummins/Onan QST30 engine

Procedure

1. Rotate the engine slowly clockwise to align the timing mark on the crankshaft damper with the timing pointer; ensure #1 cylinder (right bank) is on the compression stroke.
2. Lock fuel pump timing by reversing the timing pin in the locked position.
3. Clean debris around the in-line fuel injection pump; disconnect electrical connection (1), low pressure fuel lines (2) and oil lines (3).
4. Remove the injection pump drive shaft cover (1); disconnect fuel pump drain line and fuel return tube (2) and high pressure fuel lines (3).
5. Install protective covers to prevent dirt from entering the discharge ports.
6. Disconnect the coupling bolts (1).
7. Loosen the four injection pump bracket mounting bolts (2).
8. Remove the injection pump and bracket (3) at an angle as one unit.
9. Separate the fuel pump from the bracket by removing the mounting bolts (4).

Full service-parts list: Cummins/Onan QST30 →

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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