Cummins/Onan QST30 — Fuel Injection Pump Removal - Open Drive
Repair & overhaul
For the Cummins/Onan QST30, from the Cummins/Onan owner's manual.
Applies to: Cummins/Onan G-Drive, Cummins/Onan QST30, Cummins/Onan QST30 engine
Before you start
- Do not hammer on the fuel pump while removing the coupling; hammering will cause damage and possible engine failure.
Procedure
- Install a protective cover over the discharge port and nozzle connector inlet.
- Clean the debris from around the inline fuel injection pump.
- Remove the cover.
- Remove electrical connections and all fuel lines.
- Remove all of the oil lines.
- Move the timing lock pin to the locked position if the pump is to be reused.
- Disconnect the coupling bolts and loosen the four bracket mounting bolts.
- Remove the injection pump and bracket at an angle as one unit.
Tools required
- T-bolt puller Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan QST30 →
Source: Cummins/Onan owner's 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.