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A Quick Guide To Diesel Fuel Injection

When it comes to your diesel vehicle, understanding the many different components that make it run can be somewhat overwhelming, especially when you’re not a mechanic. Of course, this is what the experts are for, but it can be helpful to have a basic knowledge of your vehicle’s engine and its operation.

One of the most important parts of any diesel vehicle is its fuel injection system. Without this small but mighty device, your car, van or tractor wouldn’t start. Although it took decades of engineering and experimentation to develop diesel injectors, the basic principle of the component is reasonably simple.

Here is Welham Group’s quick guide to diesel fuel injection.

What Do Fuel Injectors Do?

Essentially, diesel fuel injectors are responsible for injecting diesel fuel into the engine’s cylinder as a hot and pressurised mist. The injector makes sure that the perfect amount of fuel is sent to the cylinder at any given point, ensuring the smooth and efficient running of your vehicle.

Diesel fuel injectors are the core component in a diesel engine system, without them, the vehicle simply wouldn’t run.

How Do Fuel Injectors Work?

Put simply, fuel injectors work by breaking down diesel into a fine mist when the correct level of injection pressure is reached. At around 30,000 psi, the pressure causes the injection valves to open. Once open, the valves allow the fuel to flow through the lower chamber and through tiny holes which turn the liquid into a fine mist.

Once the fuel is in mist form it is easily combustible, making the process of burning the diesel far more efficient. The valves close and the process stops as the injector pressure drops back down. Once a pressure of 30,000psi is reached again, more fuel is injected into the engine at the perfect time.

Signs Of Fuel Injection Faults

Despite their efficiency, diesel fuel injectors do encounter problems at times. As with any engine, exposure to elements, improper maintenance or simply their age can cause faults. A few common signs that your diesel fuel injector may need repairing are:

  • Difficulty starting the vehicle.
  • Misfires and failed ignition.
  • A strong smell of fuel, indicating a leak.
  • Dirty smoke emitted from the exhaust.
  • Highly inefficient miles per gallon.

Diesel Engine Repairs By Welham Group

If you’re having issues with your diesel vehicle, seeking the advice of trained professionals is the best way to resolve your problem. From fuel injection repairs to engine rebuilding services, look no further than Welham Group.

With over 70 years of experience serving Leicester and the East Midlands, our team are not only highly-skilled but also passionate about the work we do.

Get in touch with us today to discuss your requirements. Call us on 0116 276 6831 or send an email to