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.
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HOMESERVICE MANUALSBMW2013128I 2D CONVERTIBLE, ENG CD N52, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 73 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)FUEL SYSTEMFUEL DELIVERYFUEL PRESSURE & VOLUME
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans
Fuel Pressure & Volume
2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION 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) | |||
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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.