Fuel Pressure & Volume

WARNING: This page does not describe the selected car, but rather 37 other vehicles, including the 2005 BMW 760i, 2004 BMW 760Li, 2003 BMW Z8, 2003 BMW Z4, and 2003 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

To check fuel pressure, install BMW Service Tester or DIS tester with connecting line and "T" Section (13 3 064) in the fuel delivery line between fuel filter and pressure regulator. Fuel in fuel lines is under 44 psi (3 bar). Catch and dispose of escaping fuel. See FUEL PRESSURE & DELIVERY PERFORMANCE table.
Disconnect fuel return line. Attach an extension hose. Place hose in Measuring Glass (133020). Remove fuel pump relay. Apply battery voltage to relay base terminals No. 30 and 87. See Fig 1. See FUEL PRESSURE & DELIVERY PERFORMANCE table.

FUEL PRESSURE & DELIVERY PERFORMANCE

Application

Pressure psi (kg/cm² )

Min. Vol. In 30 Sec. Pts. (L)

6-Cylinder & V8

Except M5 & Z8

50 (3.5)

1.85 (0.9)

M5 & Z8

71 (5)

⁽¹⁾

12-Cylinder

50 (3.5)

2.38 (1.13)

⁽¹⁾	Information is not available from manufacturer.

Fig 1: Identifying Fuel Pump Relay Terminals & Socket

Courtesy of BMW OF NORTH AMERICA, INC.