Cummins/Onan — Fuel supply installation
Installation · Fuel system
From a Cummins/Onan owner's manual covering: CFP-015, CFP11E, CFP15E, CFP23E, CFP30E, CFP50, CFP59, CFP5E, CFP60E, CFP7E, CFP83, CFP83-F10…. Check it applies to your exact model before use.
Applies to: Cummins/Onan CFP23E, Cummins/Onan CFP83-F10, Cummins/Onan CFP83 engine
Before you start
- Do not use copper or galvanized pipe for the fuel return or supply lines.
- Do not mix gasoline, alcohol, gasohol, ethanol, or methanol with diesel fuel.
Procedure
- Install an elevated no. 2 diesel fuel tank or equivalent compatible with ASTM no. 2 diesel specifications.
- Size the fuel tank for the maximum expected full-load operation period.
- Install a fuel return line routed to the bottom of the fuel tank.
- Install a fuel supply line to the fire pump drive engine.
- Open the fuel filter/water separator drain and drain until no water is present.
Tools required
- Container for contaminated fuel Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fuel supply line at tank must be higher than fuel intake port on engine fuel pump
- Minimum supply line size 0.375 in. (9.53 mm)
- Minimum drain line size 0.25 in. (6.35 mm)
Full service-parts list: Cummins/Onan CFP23E →, Cummins/Onan CFP83-F10 →
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.