Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 BMW M5FACTORY OEM SERVICE PROCEDURE
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). 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) | |||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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