The benefits of EFI systems for improving efficiency and drive-ability have now been universally recognized. In Pakistan, these systems are also in widespread use, but due to the variable quality of the fuel and the service conditions, some special considerations will be presented in this short article.
Let us start by considering the structure of a typical fuel injector and basic operation.
As shown in the diagram, there are only a few parts to a fuel injector. The pressurized fuel rail supplies fuel which passes through a small and very fine fuel filter. This filtered fuel is held up in a plunger assembly that is opened by a solenoid when an electrical signal is received from the ECU. A spring shuts the plunger when the signal is removed. The fuel goes to the tip, which then sprays it in a fine atomized mist to help create the air:fuel mixture in the intake tract of the cylinder just upstream of the intake valve.
Understanding this structure is the key to keeping it working as well as possible.
The first requirement is good fuel supply;
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