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What is the fuel injection system in a car?

By 2022-07-16December 1st, 2022Glossary

Fuel injection system – a fuel supply system installed on modern gasoline engines to replace the outdated carburetor system. Engines with this system are called injector engines.

In the injector system, fuel injection into the airflow is performed by special injectors located either in place of the carburetor (intake manifold) – “mono injection”, or near the intake valve of each cylinder (usually structurally in the intake manifold) – “distributed injection” (aka multi-point “manifold”), or in the cylinder head, and the injection occurs in the combustion chamber – “direct injection”.

The main advantages of the injector system over the carburetor are as follows: significantly higher efficiency of the engine due to more accurate metering and atomization of fuel, precise control over the composition of the air-fuel mixture, stable engine operation in all operating modes, including at low speeds and with a large load on the engine.

The injector system also allows you to use fuel with a high octane rating and a higher content of additives that increase the efficiency of the engine. In addition, this system eliminates the need for a carburetor heater, which simplifies the design of the engine.

The disadvantages of the injector system include its complexity and high cost. In addition, this system is more demanding on the quality of fuel used.

The principle of operation of the injector system is based on the fact that the engine control unit (ECU) constantly monitors all operating parameters of the engine and, depending on them, calculates the amount of fuel required for a particular moment. This calculation is carried out taking into account the position of the accelerator pedal, engine speed, coolant temperature and other factors.

After that, a special injector delivers fuel to the intake manifold (in carburetor replacement systems) or directly into the cylinder (in direct injection systems). As a result, a correctly composed air-fuel mixture is obtained, which allows the engine to work most efficiently.

Thus, we can say that the injector system is a more modern and efficient way to supply fuel to an engine. However, it should be noted that this system is also more complex and expensive than a carburetor. Therefore, when choosing a car, you need to take into account not only the type of engine, but also the type of fuel system used.

How electronic fuel injection works – Video

Electric fuel injection is a system that injects fuel into an engine using electric pumps and sensors, instead of the traditional mechanical fuel pump. This system is more efficient and provides better engine performance.

The electronic fuel injection system consists of a fuel pump, an injector, and a control unit. The fuel pump supplies pressurized fuel to the injector, which sprays the fuel into the engine. The control unit monitors the engine’s speed and load, and tells the injector how much fuel to spray.

The electronic fuel injection system is more efficient than the traditional mechanical fuel pump because it can inject the exact amount of fuel that is needed for the current conditions. This means that the engine will run more efficiently and with less pollution.

If you have any questions about how electronic fuel injection works, feel free to ask in the comments section below. Thanks for reading!

Frequently Asked Questions (FAQ)

Fuel injection is a system that injects fuel directly into an internal combustion engine. This helps to create more efficient combustion, resulting in improved performance and lower emissions of harmful pollutants. Fuel injection also helps reduce the amount of fuel wasted during acceleration and helps maintain consistent engine speeds, even at high RPMs. In addition, fuel injection can help extend the life of your car’s engine by improving its reliability and reducing wear on components such as spark plugs and pistons. Through improved efficiency and increased power output, fuel injection can result in better overall mileage for your vehicle. All these benefits make fuel injection an excellent choice for any vehicle owner looking to get the most out of their automobile.
The most common symptoms of fuel injection problems include difficulty starting, rough idle, decreased performance, poor fuel economy, and black smoke from the vehicle’s exhaust. Other engine issues caused by a faulty fuel injection system are misfires and flooding. If your car is experiencing any of these symptoms, it may indicate a problem with the fuel injection system. A qualified mechanic should be consulted to diagnose and repair any issues properly. Diagnosing and repairing a faulty fuel injection system requires specialized tools and knowledge; therefore, it is not usually recommended for DIY auto repairs. It is highly important to solve this issue as soon as possible as it can lead to more serious problems in the future. Ignoring warning signs of failing or inadequate fuel injection can result in engine damage, stalling, and other car troubles. Taking early action can save you from costly repairs and safety concerns. If any of these symptoms are present, it is important to seek professional help quickly to ensure the issue is resolved before further damage is done.

How does a car act when the fuel injector is going out?
When a fuel injector goes terribly, the engine may start to misfire, run rough, and have difficulty accelerating. It can also cause a decrease in acceleration power and reduced overall performance of the car. In some cases, it might even emit smoke from the exhaust pipe due to combustion problems. The Check Engine Light (CEL) will often come on when there is an issue with the fuel injector, indicating that it needs attention or service soon. If left unchecked for too long, this could lead to further damage and more expensive repairs. To avoid these unnecessary costs and keep your car running smoothly, make sure you take care of any signs of a bad fuel injector immediately.


David Muench (Carnes Mechanical)

David Muench (Carnes Mechanical)

Hey, I’m David. I’ve worked in a cars store for 6 years. I write reviews and guides, helping people to choose the most suitable technicals and best product for them. I’m happy to finally share my knowledge of the industry here, on CarnesMechanical.

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