0103 070 Overflow Valve for Injector Pump — Volvo

What does an injector pump overflow valve do?

The injection pump overflow valve is a critical control component that maintains constant internal pump pressure by redirecting excess fuel back to the return line. By regulating this pressure balance, the valve directly influences engine power, idle stability, and overall fuel consumption efficiency in diesel systems.

Compatible vehicles and engines

This component is compatible with Volvo engines such as D12, D13, and D16 series, as well as Renault Trucks engines including DXi11, DXi12, and DXi13. It is also fitted to Mack Granite and Pinnacle models with MP7 and MP8 engines. This part ensures precise fuel metering for heavy commercial vehicle applications.

Installation and maintenance

When replacing this part, technicians should verify the thread size of M16x1,5 and ensure the component is seated correctly to prevent pressure leaks. Maintaining the integrity of the fuel return circuit is essential for preventing engine hesitation or excessive fuel consumption. Check the compatibility list.

Troubleshooting

Regular inspection of the overflow valve can help prevent sudden engine performance drops caused by pressure imbalances in the injection system.

OE cross-reference

0103 070 (Injector Pump Overflow Valve) is the equivalent of the LASO, Renault Trucks and Volvo OE numbers. This part directly replaces LASO OE number 98091501. It also replaces Renault Trucks OE number 7421458307 and Volvo OE number 21458307.