Cummins/Onan 4.0 BF-1R/9500 — Replacing Carburetor Needle and Valve Seat
Repair & overhaul
For the Cummins/Onan 4.0 BF-1R/9500, from the Cummins/Onan service manual.
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Before you start
- Do not bend the float when installed
Procedure
- Remove 7/16 inch hex at base of fuel bowl and lift bowl from carburetor
- Push out pin holding float to carburetor body; disconnect spring holding needle to float
- Remove float and set aside; pull out needle and remove needle valve seat with a large screwdriver
- Install new valve seat and needle and replace float
- Adjust float
- Install new gaskets when reassembling
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.