20741620 Volvo FM12 D12D Overflow Valve

What does an overflow valve do?

The injector pump overflow valve is a critical control component that maintains internal pump pressure by redirecting excess fuel back to the return line. This component ensures the injection pump operates within its designed pressure range, which is essential for stable engine combustion and consistent power delivery in heavy commercial vehicles.

Compatibility with Volvo FM12

This specific overflow valve is engineered for Volvo FM12 trucks equipped with D12D engines. It features an M10x1 thread size to ensure precise fitment within the fuel system. For technicians performing maintenance, it is vital to verify that the valve matches the specific requirements of the existing injection pump to ensure correct pressure regulation.

Installation and maintenance

When replacing this component, technicians should inspect the surrounding fuel lines and ensure all sealing elements are properly seated. Maintaining the integrity of the overflow valve helps prevent symptoms such as irregular idling or increased fuel consumption. Always consult your authorized distributor for correct application details.

Troubleshooting engine performance

A malfunctioning overflow valve can disrupt the pressure balance of the injection pump, leading to a loss of engine performance. Regular inspection of fuel system components during scheduled maintenance can prevent unexpected downtime for fleet operators and workshop 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 20741620.