Genuine Cummins Onan low-pressure 12V fuel pump with wiring for select Onan RV generator fuel systems.
The Cummins Onan A064S965 is a replacement low-pressure fuel pump used on select Onan RV generator models. A weak or failed fuel pump can prevent the generator from getting the steady fuel supply it needs to start and continue running.
This pump is commonly listed for Onan QC Series, Emerald Advantage, and Marquis HGJ model RV generators. It replaces several earlier Onan fuel pump numbers, including A047N929, A029F887, and 149-2620. Always verify your generator model, spec letter, and existing pump number before ordering.
Replacement low-pressure fuel pump for compatible Onan RV generator applications
Designed for select Cummins Onan generator fuel system configurations
Common replacement for A047N929, A029F887, and 149-2620
Commonly listed as a fuel pump assembly supplied with wiring
This fuel pump is not universal for all Onan generators. It is commonly listed for select QC Series, Emerald Advantage, and Marquis HGJ model RV generators, but generator model and spec letter should still be verified before ordering. Fuel delivery problems can also be caused by a clogged fuel filter, old fuel, cracked fuel line, low fuel level in the RV tank, carburetor issues, wiring problems, or a generator control issue.
Before Starting: Shut down the generator, allow it to cool, disconnect starting power as required, and follow all fuel system safety precautions. Work in a well-ventilated area away from sparks, flames, and ignition sources. Basic Replacement Steps: 1. Confirm Compatibility: Verify generator model, spec letter, and existing fuel pump part number before removing parts. 2. Relieve and Secure Fuel System: Follow the generator service procedure and prepare for possible fuel drips during pump removal. 3. Document Wiring and Fuel Lines: Take clear photos of the pump wiring and fuel line routing before disconnecting anything. 4. Disconnect Old Pump: Carefully disconnect the electrical connector/wiring and fuel lines from the old pump. 5. Remove Pump: Remove the existing fuel pump from its mounting location. 6. Install Replacement Pump: Mount the new pump in the correct orientation and reconnect fuel lines and wiring. 7. Check for Leaks: Prime or run the generator according to the service procedure and inspect all fuel connections. 8. Test Operation: Start the generator and confirm stable running under appropriate load.
Package Contents: • Cummins Onan A064S965 fuel pump • Wiring attached/supplied with pump assembly NOT Included — May Also Need: • Fuel filter • Fuel line or clamps • Mounting hardware, if existing hardware is damaged • Electrical connectors or terminals, if existing wiring is damaged • Carburetor or fuel system service parts Inspect the fuel filter, fuel lines, clamps, wiring, and connections before replacing the pump. Additional parts may be required depending on the generator condition.
To confirm compatibility before ordering, have the following ready: • Generator model number • Spec letter • Serial number • Existing fuel pump part number, if visible • Fuel type and generator series • Description of the generator symptom being diagnosed Why this matters: Onan fuel pumps vary by generator model, spec, and fuel system configuration. Matching the old pump number and generator nameplate helps avoid ordering a pump that looks similar but does not match the application.
Match this fuel pump by generator model, spec letter, and original pump number whenever possible. Fuel pump fitment should not be confirmed by appearance alone.
Fuel system issues should be diagnosed carefully before replacing parts. A generator that runs poorly may have a pump issue, but fuel filters, fuel lines, carburetor condition, wiring, and fuel quality should also be checked.