Description

Genuine OEM Yanmar fuel feed pump assembly (part number 121256-52021) designed to deliver reliable fuel transfer from the tank to your engine’s injection system. This complete factory-spec pump assembly ensures consistent fuel flow and pressure, maintaining optimal engine performance and preventing fuel starvation issues.

Key Features:

• Genuine Yanmar OEM part – exact fit and performance
• Part Number: 121256-52021
• Complete pump assembly ready to install
• Precision-engineered for consistent fuel delivery
• Durable construction for long service life
• Maintains proper fuel pressure and flow
• Direct replacement for worn or failed fuel pumps

Function & Importance:

The fuel feed pump (also called a lift pump) is a critical component that transfers diesel fuel from the tank to the injection pump. It maintains the proper fuel pressure needed for efficient combustion and smooth engine operation. A failing fuel pump can cause hard starting, loss of power, rough running, or complete engine shutdown.

Signs of Fuel Pump Failure:

• Difficulty starting, especially when hot
• Loss of power under load
• Engine stalling or dying unexpectedly
• Rough idle or surging
• Visible fuel leaks around the pump
• Air in the fuel system

Installation:

Always replace the mounting gasket when installing a new fuel pump (gasket sold separately). Ensure all fuel lines are clean and free of debris. Prime the fuel system after installation to remove air. Check for leaks before starting the engine. Torque mounting bolts to manufacturer specifications. Refer to your Yanmar service manual for detailed installation procedures specific to your engine model.

Compatibility:

Verify this part number matches your engine’s requirements before ordering. Consult your Yanmar engine manual or parts diagram for your specific model, or contact technical support if you need assistance confirming compatibility.

Restore reliable fuel delivery to your Yanmar diesel with this genuine OEM fuel feed pump assembly. Essential for maintaining peak engine performance and preventing fuel system failures.