Fuel Delivery: Notes

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.