20741620 Volvo FMX D13C Overflow Valve

What does an overflow valve do?

The injector pump overflow valve is a critical component that maintains internal pump pressure by redirecting excess fuel back to the return line. By regulating this pressure, the valve directly influences engine idle stability and fuel consumption efficiency. This component is essential for preventing pressure imbalances within the diesel injection pump system.

Vehicle and engine compatibility

This specific overflow valve is designed for use in Volvo FMX trucks equipped with D13C engines. It provides a reliable solution for heavy commercial vehicle fleets requiring precise fuel system control. It is compatible with Volvo systems and ensures optimal performance under demanding duty cycles.

Installation and maintenance

When performing installation, technicians should ensure the M10x1 thread is seated correctly and that no contaminants enter the fuel lines. Because air or dirt entering the fuel system can cause serious faults, it is recommended that an experienced workshop perform the job and bleed the system of air after installation.

Selection and troubleshooting

To ensure correct fitment, verify the engine model and any existing pump specifications before replacement. Maintaining a clean working environment during the swap prevents debris from entering the fuel circuit, protecting the integrity of the entire injection system.

OE cross-reference

0103 064 (Injector Pump Overflow Valve) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 20741620.