Compared to traditional gasoline engines, diesel engines burn through fuel much slower. Diesel’s thicker consistency helps it last longer and provides most diesel-powered vehicles with better mileage. However, there are some common causes of high fuel consumption in diesel engines that you may want to know about. If it seems like you need to stop by the fuel pumps more often than usual, your engine may be experiencing one of these problems.

Faulty Fuel Injectors

One of the main components that keeps your engine running is the fuel injection system. Fuel injectors release fuel in a specifically timed mist so that it gets into the engine steadily and with a properly balanced air mixture. Increased fuel consumption is one of many possible signs that your fuel injectors need replacing, and these parts should be one of the first things you investigate when looking for the culprit behind your higher fuel usage.

External Factors

Some people believe that fuel burns based on distance, but that’s not always the case. In some situations, one of the most common causes of high fuel consumption in diesel engines comes from external factors that you put on the vehicle. If your vehicle is carrying more weight than normal or has outside additions like bike racks, you may find yourself going through fuel more quickly because your vehicle has to put more exertion into moving.

Fuel Quality

Diesel engines require specific viscosity grades depending on the manufacturer, and using low-quality or mismatched fuel may cause your engine to burn through it faster than normal. You want to ensure that you’re using the right fuel for your engine, and consider some helpful fuel additives or after-treatment systems to get the most mileage out of your full tank.

Dirty Filters

If you haven’t replaced the filters in a while, the built-up dust and dirt can greatly increase your engine’s fuel consumption as it needs more fuel to perform basic functions. Cleaning or replacing your engine’s air filter can be a big help—you should replace your fuel filter every 10,000 to 15,000 miles. Having unobstructed filters can make a significant difference when it comes to your engine’s fuel efficiency.

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