20523255 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 fuel injection pump. By redirecting excess fuel back to the return line, it ensures that the injection timing and pressure remain consistent, which is vital for stable engine operation and efficient combustion.

Vehicle and engine compatibility

This component is specifically compatible with Volvo FMX trucks equipped with D13C engines. It serves as a reliable replacement part for maintaining the integrity of the diesel fuel system in heavy commercial vehicles.

Installation and maintenance

When installing this component, technicians should ensure the M10x1 thread is seated correctly and that no air or contaminants enter the fuel lines. It is highly recommended that an experienced workshop performs the replacement and bleeds the system to prevent engine misfires or performance loss.

Troubleshooting and selection

Monitoring fuel consumption and idle stability can help identify if an overflow valve requires attention. If engine power fluctuates, check the valve to ensure it is maintaining the required pressure regulation within the pump.

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.