Cummins/Onan — Priming the Fuel System
Maintenance
From a Cummins/Onan service manual covering: ES2075s, FS1870s, M11979s, M1976s, M1977s, M1978s. Check it applies to your exact model before use.
Applies to: Kubota 2482B engine
Before you start
- Accidentally starting the power unit can cause severe personal injury or death; do not allow anyone inside the sleeper during this operation.
Procedure
- Make sure the fuel shutoff valve is in the open position.
- Place a container under the fuel filter and loosen the fuel filter assembly bleed screw.
- Disconnect the tan positive lead from the fuel pump at the inline harness connector.
- Wire a jumper lead with a normally open switch between the alternator B+ terminal or battery positive terminal and the tan fuel pump lead.
- Close the jumper switch to energize the fuel pump until fuel purges at the fuel filter bleed screw.
- Secure the bleed screw in the fuel filter housing.
- Place a container under the injector pump and loosen the bleed screw on the injector pump housing.
- Energize the fuel pump until fuel purges from the injector pump bleed screw opening.
- Secure the bleed screw in the injector pump housing.
- Remove the jumper leads from the alternator B+ or battery positive terminal and from the tan fuel pump lead.
- Reconnect the fuel pump tan positive lead inline connector to the harness.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.