20523255 Volvo FM11 D11A Overflow Valve

What does an overflow valve do?

The injector pump overflow valve is a critical control component that maintains internal pump pressure by redirecting excess fuel back to the return line. This regulation is essential for ensuring stable engine operation and consistent fuel delivery during heavy-duty cycles.

Vehicle and engine compatibility

This specific component is compatible with Volvo FM11 trucks equipped with D11A engines. It is engineered to meet the rigorous demands of heavy commercial vehicle applications, providing a reliable solution for maintaining precise fuel system pressure.

Installation and maintenance

When installing this valve, ensure the M10x1 thread is clean and seated correctly to prevent air or dirt from entering the fuel system. It is recommended that a workshop technician performs the replacement to ensure the system is properly bled of air after installation.

System performance and selection

Properly functioning overflow valves help prevent issues such as irregular idling or increased fuel consumption. Always verify that the valve matches the specific requirements of the injection pump to ensure optimal performance.

OE cross-reference

0103 064 (Injector Pump Overflow Valve) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 20523255.