Cummins/Onan 5.0BF - 34 3E / S.OSF - 34 IE — Fuel Pump Disassembly
Repair & overhaul
For the Cummins/Onan 5.0BF - 34 3E / S.OSF - 34 IE, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 5.0BF - 34 3E, Cummins/Onan BF engine
Before you start
- Use care when reassembling; all parts must be perfectly aligned.
Procedure
- Remove vacuum line and fuel line.
- Remove two fuel pump attaching screws.
- Grasp pump and carefully pull apart.
- Diaphragm, plunger, return spring, pump body and gaskets will be loose.
- Internal parts are available in a repair kit.
Full service-parts list: Cummins/Onan 5.0BF - 34 3E →
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.