Cummins/Onan — Fuel System Prime
Maintenance · Fuel filters / injection system
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFJA, Cummins/Onan DFJB, Cummins/Onan DFJC, Cummins/Onan DFJD, Cummins/Onan KTA38-G1 engine, Cummins/Onan KTA38-G2 engine, Cummins/Onan KTA38-G3 engine, Cummins/Onan KTA38-G4(G5) engine
Before you start
- Due to the precise tolerances of diesel injection systems, keep fuel clean and free of water. Dirt or water can cause severe damage to the injection pump and injection nozzles.
Procedure
- Remove each fuel filter and fill with clean fuel.
- Put a light coat of fuel on the sealing gasket.
- Install and tighten by hand until the gasket just touches the filter head.
- Tighten the filter an additional one-half to three-fourths turn.
Specs & values
- Tighten filter an additional one-half to three-fourths turn after gasket contacts head
Full service-parts list: Cummins/Onan DFJA →, Cummins/Onan DFJB →, Cummins/Onan DFJC →, Cummins/Onan DFJD →
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.