Fuel Pressure & Volume
- 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) pressure. 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) |
|
| 12-Cylinder |
50 (3.5) |
2.38 (1.13) |
Courtesy of BMW OF NORTH AMERICA, INC.