vorpumpe

Vorpumpe is a term used in German technical vocabulary to denote a pre-pump or lift pump in fluid systems. Its function is to move fluid from a reservoir to a main pump, providing low-pressure delivery that helps prime the system, maintain a continuous supply, and reduce cavitation in the subsequent stage of pumping.

In automotive fuel systems, the vorpumpe refers to the low-pressure fuel pump that feeds the high-pressure injection system. It is commonly located in or near the fuel tank and is usually electrically driven. The vorpumpe draws fuel from the tank, filters it, and delivers it to the low-pressure side of the injection pump at modest pressure. This helps ensure a stable supply to the high-pressure pump, supports cold-starts, and can reduce noise and wear in the main pump.

In hydraulic systems, a vorpumpe may describe the initial stage that creates a pre-pressure to the main hydraulic pump. By delivering fluid at low pressure, it facilitates priming, improves startup behavior, and can enhance overall system efficiency and longevity of the primary pump.

Operation and maintenance considerations vary by application. Typical symptoms of a faulty vorpumpe include hard starting, low or unstable system pressure, engine stalling, or unusual pump noise. Maintenance may involve replacing worn or corroded pumps, cleaning or replacing filters and screens, and inspecting electrical connections or fuel lines for leaks. Ensuring clean working fluids and preventing air ingress are important for reliable operation.

Etymology: vorpumpe is German for “forepump” or “pre-pump.” In English literature the term lift pump or low-pressure pump is commonly used for similar devices.