0101 039 Injector Pump Overflow Valve — Mercedes-Benz

What does an overflow valve do?

This injector pump overflow valve serves as a vital pressure regulation component within the fuel injection system. By redirecting excess fuel back to the return line, it maintains the necessary pressure balance inside the injection pump, which is essential for stable engine operation and consistent fuel delivery.

Compatible vehicle applications

This component is specifically designed to fit heavy commercial vehicle applications, including MAN and Mercedes-Benz engines. It functions to prevent pressure spikes that could disrupt fuel flow, thereby protecting the injection pump and ensuring reliable combustion cycles during heavy-duty operation.

Installation and maintenance guidance

For workshop technicians, maintaining this part is crucial for preventing symptoms like irregular idling or increased fuel consumption. When replacing, ensure the seating surfaces are clean to maintain a proper seal against the pump body. Check the return lines for any obstructions during installation to ensure optimal pressure relief.

Troubleshooting fuel pressure issues

VADEN ORIGINAL components are manufactured to meet strict requirements for durability in demanding environments. Consult your authorized distributor to check the compatibility list.

OE cross-reference

0101 039 (Injector Pump Overflow Valve) is the equivalent of the MAN and Mercedes-Benz OE numbers. This part directly replaces MAN OE number 51981500173. It also replaces Mercedes-Benz OE number 4429905563.