Cummins/Onan — Drain Fuel-Water Separator (Spin-on Type)
Maintenance
From a Cummins/Onan owner's manual covering: 6CTA8.3, CFP83-F10, CFP83-F20, CFP83-F30, CFP83-F40. Check it applies to your exact model before use.
Applies to: Cummins/Onan 6CTA8.3, Cummins/Onan CFP83-F10, Cummins/Onan CFP83-F20, Cummins/Onan CFP83-F30, Cummins/Onan CFP83-F40, Cummins/Onan 6CTA8.3G2 engine, Cummins/Onan 6CTAA8.3G3 engine
Before you start
- When closing the drain valve, do not over-tighten the valve. Over-tightening can damage the threads.
Procedure
- Use your hand to open the drain valve; turn it counterclockwise approximately 3½ turns until the valve drops down 25.4 mm [1 in] and draining occurs.
- Drain the filter sump until clear fuel is visible.
- Close the valve by lifting and turning it clockwise until hand-tight.
- If more than 59 ml (2 oz) is drained, refill the filter to prevent hard starting.
Specs & values
- If more than 59 ml (2 oz) is drained, refilling of the filter is required
Full service-parts list: Cummins/Onan CFP83-F10 →, Cummins/Onan CFP83-F20 →, Cummins/Onan CFP83-F30 →, Cummins/Onan CFP83-F40 →
Source: Cummins/Onan owner's 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.