20741620 Volvo FH12 D12C Overflow Valve

What does an overflow valve do?

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

Compatibility and engine fitment

This specific component is compatible with Volvo FH12 trucks utilizing the D12C engine. It is engineered to meet the rigorous demands of heavy-duty operation, providing a reliable solution for fleet managers and workshop technicians looking to maintain engine performance through precise fuel regulation.

Installation and maintenance guidance

Installation should be performed in a clean environment to prevent contaminants from entering the fuel system. When replacing this component, ensure the M10x1 thread is correctly seated and that the fuel system is properly bled of air after installation to prevent airlock issues during engine startup.

Troubleshooting and selection

Maintaining the correct overflow valve pressure is essential for preventing symptoms like increased fuel consumption or irregular idling. Always verify that the part matches the technical requirements of the specific injection pump used in the vehicle's engine group.

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.