Cummins/Onan — Priming Fuel System
Operation
From a Cummins/Onan owner's manual covering: 25.0 DEH-515R, 25.0 DEH-53R, 30.0 DEH-15R, 30.0 DEH-3R, 30.0 DEH-9XR. Check it applies to your exact model before use.
Applies to: Cummins/Onan 25.0 DEH-515R, Cummins/Onan 25.0 DEH-53R, Cummins/Onan 30.0 DEH-15R, Cummins/Onan 30.0 DEH-3R, Cummins/Onan 30.0 DEH-9XR, Ford 2711E engine
Before you start
- Do not smoke while handling fuel. Diesel fuel is flammable.
Procedure
- Open bleed screw on inlet side of fuel filter.
- Actuate priming lever on fuel transfer pump until bubble-free fuel flows.
- Close filter inlet bleed screw.
- Open bleed screw on outlet side of filter.
- Actuate priming lever until bubble-free fuel flows; close screw.
- Open one or two bleed screws on injection pump.
- Actuate priming lever until bubble-free fuel emitted.
- Close bleed screw(s) and torque to specification.
Specs & values
- Filter bleed screws 5-7 lb-ft (6.88 to 9.5 N.m)
- Pump bleed screws 3-5 lb-ft (4.1 to 6.8 N.m)
Full service-parts list: Cummins/Onan 25.0 DEH-515R →, Cummins/Onan 25.0 DEH-53R →, Cummins/Onan 30.0 DEH-15R →, Cummins/Onan 30.0 DEH-3R →, Cummins/Onan 30.0 DEH-9XR →
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.