Cummins/Onan — Fuel Rail & Injectors - Replacement
Repair & overhaul · Fuel rail and injectors
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Fuel in the fuel system remains under high pressure even when the engine is not running. Relieve pressure before disconnecting components.
Procedure
- Disconnect the battery ground cable.
- Disconnect fuel lines and plug the ends.
- Disconnect injector electrical connectors.
- Remove bolts and carefully remove fuel rail and injector assembly.
- Lubricate new o-rings with clean engine oil and reassemble.
- Tighten fuel rail bolts to 25 Nm (18 lb-ft).
Specs & values
- Fuel rail bolts 25 Nm (18 lb-ft)
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.