21697342 Volvo B11R D11A Overflow Valve

What does an overflow valve do?

This injector pump overflow valve is a critical control component designed to maintain constant internal pressure within the injection pump by redirecting excess fuel back to the return line. Ensuring precise pressure balance is essential for stable engine operation and consistent fuel delivery under heavy loads.

Vehicle and engine compatibility

This part is compatible with Volvo B11R trucks featuring the D11A engine. It serves as a reliable replacement to maintain optimal performance in heavy commercial vehicle fuel systems.

Installation and maintenance

Installation should be performed by a workshop technician to ensure no air or contaminants enter the fuel system. When replacing the valve, ensure the M10x1 thread is seated correctly and that the system is properly bled of air to prevent engine hesitation or starting issues.

Troubleshooting fuel pressure

Monitoring fuel pressure stability can help identify early signs of valve wear, such as inconsistent idling or increased consumption.

OE cross-reference

0103 064 (Injector Pump Overflow Valve) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 21697342.