21419969 Volvo FH16 D16G Overflow Valve

What does an overflow valve do?

This injector pump overflow valve is a critical control component designed to maintain constant internal pump pressure by redirecting excess fuel back to the return line. By stabilizing the pressure balance within the fuel system, it directly influences engine power, idle stability, and fuel efficiency. Using high-strength components, this part ensures reliable performance under heavy-duty operating conditions.

Vehicle and engine compatibility

This component is specifically compatible with Volvo FH16 trucks equipped with D16G engines. It serves as a reliable replacement for maintaining the integrity of the fuel injection system in these heavy commercial vehicle applications.

Installation and maintenance

For correct installation, technicians should verify the M10x1 thread size and ensure the valve is seated correctly within the pump body to prevent pressure leaks. Regular inspection of fuel system components can help prevent performance drops caused by pressure fluctuations.

Troubleshooting performance issues

If engine idling becomes unstable or fuel consumption increases unexpectedly, it may indicate that the overflow valve is no longer maintaining the required pressure balance. Always consult your authorized distributor to confirm exact fitment for your specific engine series.

OE cross-reference

0103 064 (Injector Pump Overflow Valve) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 21419969.