20523255 Volvo FM13 D13C Overflow Valve

What does an overflow valve do?

This injector pump overflow valve serves as a critical control component within the fuel system, responsible for maintaining constant internal pump pressure. By redirecting excess fuel back to the return line, it prevents pressure imbalances that can lead to unstable idling or increased fuel consumption. This component is manufactured using high-strength components to withstand heavy-duty service conditions.

Vehicle compatibility and engine fitment

Specifically designed for Volvo FM13 trucks equipped with D13C engines, this part ensures precise fuel regulation. It is a reliable replacement for workshop technicians maintaining heavy commercial vehicle fleets. Check the compatibility list.

Installation and maintenance guidance

Installation should be performed in a clean environment to prevent contaminants from entering the fuel system. When replacing the valve, ensure the M10x1 thread is properly seated and the system is thoroughly bled of air to avoid air locks. Maintaining the correct torque during installation is essential for long-term seal integrity.

Troubleshooting fuel pressure issues

Monitoring fuel system pressure and engine stability can help identify if an overflow valve requires replacement. A malfunctioning valve often manifests as erratic engine performance or poor idling stability.

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.