FUEL DELIVERY
Note. For fuel system pressure testing, see BASIC DIAGNOSTIC PROCEDURES article.
Before any service work is performed on any fuel system related component, always adhere to the following
- Observe relevant safety legislation pertaining to your area.
- Ensure adequate ventilation.
- Use exhaust extraction system where applicable (alleviate fumes).
- Do not operate the fuel pump unless it is properly installed in the fuel tank and is submersed in the fuel (fuel lubricates the pump).
- Always wear adequate protection clothing including eye protection.
- Use caution when working around a hot engine compartment.
- During fuel system repair that involves "sealing rings" always replace them with new copper rings only.
- BMW does not recommend any unauthorized modifications to the fuel system. The fuel system is designed to comply with strict federal safety and emissions regulations.
- Fuel quality should always be considered when diagnosing a driveability complaint. The type of fuel, proper AKI rating, impurities and moisture are not factored by the ECM.