Cummins/Onan — Assemble the fuel transfer pump
Repair & overhaul
From a Cummins/Onan service manual covering: 205D3A, 3DJA, 3DJA-1E2236, 3DJA-3E2236. Check it applies to your exact model before use.
Applies to: Cummins/Onan DJA engine
Procedure
- Soak new diaphragm in fuel before assembling.
- Insert diaphragm spring and soaked diaphragm into pump body.
- Insert link and rocker arm; hook over diaphragm pull rod.
- Drive in rocker arm pin with priming lever in lowest position.
- Compress rocker spring and install between body and rocker arm.
- Insert valve cages, gaskets and valve cover plate.
- Assemble cover to body with notch marks lined up.
- Push rocker arm full stroke to flex diaphragm, then tighten cover screws.
Specs & values
- Priming lever must be in lowest position when installing rocker arm.
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.