21010372 Volvo FH13 D13C Overflow Valve

What does an overflow valve do?

This injector pump overflow valve is a critical control component that maintains constant internal pump pressure by redirecting excess fuel back to the return line. By regulating the pressure balance, it directly influences engine power, idle stability, and fuel consumption efficiency in heavy commercial vehicle engines.

Compatible vehicles and engines

This specific part is designed for Volvo FH13 trucks equipped with D13C engines. It serves as a reliable replacement for original components, ensuring the fuel system maintains the precise pressure required for heavy-duty operation.

Installation and maintenance

When installing this M10x1 thread valve, technicians should ensure the area is clean to prevent contaminants from entering the fuel system. It is essential to bleed any air from the system after installation to maintain proper engine performance and prevent misfires.

Troubleshooting and selection

To ensure correct fitment, always verify the pump type and opening pressure requirements before replacement. A faulty valve can lead to increased fuel consumption or erratic idling in heavy commercial vehicles.

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.