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How Does a Fuel Injector Work? Increase Your Gas Mileage.

Increase Your Gas Mileage.


It’s a good question and one that deserves an appropriate answer.

For those people who remember carburetors in older cars or who still use them, there is a fondness for the old-style engineering.

However, fuel injection has given us the means to increase fuel efficiency and meet the constantly changing standards issued by governments.

There were a variety of reasons for ending their use in modern automobiles.


How Does a Fuel Injector Work?

First, the carburetor was simply unable to keep up with the increased standards for fuel efficiency and exhaust emissions.

Unfortunately, these new carburetors became too complex for many cars to use and eventually needed to be replaced. Fuel-injection had been used in some high-performance cars.

The single-point fuel injector was first used by automakers since it was easy to simply bolt into place where the carburetor would have been.

Although a great advancement, automakers soon realized the need for multi-point fuel injectors that would individually deliver fuel to each cylinder.

In doing so, the multiple injectors could more easily control the amount of fuel use while delivering that fuel as a fine vapor or mist. 

The oxygen sensor in the exhaust system monitors the amount of oxygen leaving the cylinders. It allows the car’s computer to adjust the richness of the fuel mixture.

The engine control unit (ECU) maintains control of the amount of fuel released by the fuel injectors. As you apply pressure to the accelerator pedal, an air throttle opens to allow air inside the engine. The ECU “sees” this opening and measures how much air enters the engine. Then, it uses this information to determine how much fuel to release through the injectors. A small electromagnet inside each injector causes a plunger to move. Opening the end of the injector to allow a small amount of fuel to enter the cylinder valve directly.

The amount of fuel needed determines how long the plunger remains open. Each cylinder has its own fuel injector and on occasion one or more injectors may need replacement as they age.

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