21010372 Volvo FMX D13C Overflow Valve

What does an overflow valve do?

This injector pump overflow valve plays a critical role in maintaining the internal pressure balance of the diesel injection pump. By redirecting excess fuel back to the return line, it ensures that the pump operates within required pressure limits, which is essential for stable combustion and consistent engine performance.

Vehicle and engine compatibility

This specific part is designed for Volvo FMX heavy commercial vehicles equipped with D13C engines. It serves as a reliable replacement component to prevent issues such as irregular idling or increased fuel consumption caused by pressure fluctuations within the fuel system.

Installation and maintenance

When performing installation, ensure the M10x1 thread interface is clean and that the system is properly bled of air once the new valve is seated. Because any air or debris entering the fuel system can lead to significant engine faults, professional workshop installation is recommended to maintain system integrity.

Troubleshooting and selection

Consult your authorized distributor to ensure this component matches your specific engine requirements and to verify compatibility with your existing injection pump setup.

OE cross-reference

0103 064 (Injector Pump Overflow Valve) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 21010372.