Excavator E322B E325 series engine fuel pump 4P4306 4P-4306 6I4267 6I-4267 engine 3116 series

Excavator E322B E325 Series Engine Fuel Pump 4P4306 4P-4306 6I4267 6I-4267 Engine 3116 Series

The bulldozer engine fuel pump is a core component of the fuel supply system. Its function is to draw fuel from the fuel tank, pressurize it, and then stably deliver it to the engine combustion chamber through fuel lines, ensuring normal engine operation. The following is a detailed introduction to bulldozer fuel pumps:

Structure and Working Principle

Structural Type: Bulldozer fuel pumps typically employ gear-type or plunger-type structures. Modern designs often integrate components such as the motor, pump body, and filter, forming a modular unit.

Working Principle: The impeller or plunger is driven by an electric motor to rotate, creating a vacuum in the inlet chamber to draw fuel in. Centrifugal force pressurizes the fuel in the outlet chamber, ultimately delivering it to the engine at a constant pressure. Some models (such as the Caterpillar D9) require a fuel pressure regulator to establish system pressure.

Core Functions

Fuel Delivery: Draws fuel from the fuel tank, overcoming pipeline resistance to continuously supply fuel.

Pressure Maintenance: Works with the pressure regulator to ensure stable fuel pressure at the injectors (e.g., PT pump outlet pressure can reach 8×10⁵~12×10⁵ Pa).

Circulation Stabilization: Some designs support fuel recirculation back to the fuel tank, reducing vapor lock and maintaining balanced fuel system temperature.