Fuel Management: Notes

Fig 1: Fuel Management System Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

Fuel Supply System: For the N73 engine, minor modifications have been made to the fuel supply system to adapt it to the direct injection system. The additional features are:

Leakage line
Electric fuel pump with increased delivery

The N73 in tank electric fuel pump is a roller cell type (EKP Bosch 3.1) with an increased delivery pressure of 6 bar. This pressure is required to adequately supply the high pressure fuel pumps.