Cummins/Onan — Float Adjustment
Adjustments · Carburetor float
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan NHC-NHCV engine
Before you start
- Attempting adjustments with float assembly installed may deform inlet needle and seat.
Procedure
- Disconnect throttle control, choke leads, breather hose, air cleaner inlet hose, and fuel line from carburetor.
- Remove four intake manifold bolts and remove carburetor and manifold as one unit.
- Remove carburetor from intake manifold.
- Separate upper body from fuel bowl section.
- Measure float level.
- If incorrect, remove float assembly and bend tang slightly as specified in Figure 13.
- Reassemble and install.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Float level adjustment: 1/8 ± 1/16 inch (bend tab)
- Float drop: 0.25 inch
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.