21010372 Volvo FH13 D13A Overflow Valve

What does an overflow valve do?

This injector pump overflow valve plays a critical role in maintaining constant internal pressure within the fuel injection pump. By redirecting excess fuel back to the return line, it ensures stable engine performance and consistent idle stability for heavy commercial vehicle engines.

Vehicle and engine compatibility

This component is specifically designed for Volvo FH13 trucks equipped with D13A engines. It serves as a reliable replacement for maintaining the fuel system's pressure balance in demanding service environments.

Installation and maintenance

When performing installation, ensure the M10x1 thread is clean and free of debris to prevent contamination within the fuel circuit. It is highly recommended that an experienced workshop technician handles the replacement to ensure the system is properly bled of air after installation.

Troubleshooting guidance

If the engine exhibits irregular idling or increased fuel consumption, verifying the condition of this valve is a standard troubleshooting step for fleet managers and technicians.

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.