Cummins/Onan — Carburetor Float Adjustments
Adjustments
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Attempting adjustments with float assembly installed might damage inlet needle and seat.
Procedure
- Remove intake manifold assembly and carburetor.
- Separate upper body of carburetor from fuel bowl section.
- Identify carburetor type A or type B before adjusting.
- For Type A, hold carburetor as shown; place straight edge across top of bowl without gasket.
- Measure distance between top of float and straight edge; adjust by bending at indicated point.
- For Type B, check float drop and float level per Table 1.
- For BF, invert fuel bowl cover, place bowl cover gasket, measure float setting.
- Remove float assembly before making adjustments.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Float drop and float level per Table 1
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.