Cummins/Onan DJ30 — Bleed the Fuel System
Maintenance · Secondary fuel filter / transfer pump
For the Cummins/Onan DJ30, from the Cummins/Onan service manual.
Applies to: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T, Cummins/Onan DJA engine
Procedure
- Open the air bleed screw on top of the secondary filter.
- Operate the hand priming lever on the transfer pump.
- Continue until no air bubbles flow from the bleed screw hole.
- Tighten the bleed screw and return the priming lever to its original position.
- If the transfer pump cam lobe is on the high side, turn engine one revolution before priming.
Full service-parts list: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T →
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.