An introduction to the Detroit Diesel DD13 and DD15 Fuel System

  • December 17, 2022 | Bosch

Detroit Diesel DD13 and DD15 engines are heavy-duty diesel engines used in commercial vehicles, such as trucks and buses. These engines are known for their reliability, durability, and fuel efficiency.

The fuel system on the DD13 and DD15 engines is an important component that helps ensure the engine runs smoothly and efficiently. It is responsible for delivering the right amount of fuel to the engine at the right time, in the right ratio with air, and at the right pressure.

The fuel system on these engines consists of a fuel tank, fuel filter, fuel pump, fuel injectors, and a fuel rail.

The fuel tank stores the diesel fuel that is used by the engine. It is typically made of metal or plastic and is located under the vehicle. The fuel filter is located between the fuel tank and the fuel pump, and its job is to remove any dirt, debris, or contaminants from the fuel before it enters the fuel pump.

The fuel pump is an electric or mechanical device that pumps the fuel from the fuel tank to the fuel rail, which is a pipe that carries the fuel to the fuel injectors. The fuel injectors are responsible for injecting the fuel into the engine’s combustion chamber in precise amounts at the right time.

One of the key features of the DD13 and DD15 fuel systems is the Bosch high-pressure common rail injection system. This system uses a high-pressure fuel pump to pressurize the fuel up to 29,000 psi before it is injected into the combustion chamber. This helps improve fuel efficiency and reduce emissions by allowing for more precise fuel delivery and better combustion.

Another important feature of these fuel systems is the use of diesel exhaust fluid (DEF), also known as AdBlue. DEF is a non-toxic, clear liquid that is injected into the exhaust stream to reduce nitrogen oxide (NOx) emissions.

In conclusion, the fuel system on the Detroit Diesel DD13 and DD15 engines is a critical component that plays a vital role in ensuring the engine runs smoothly and efficiently. Its high-pressure common rail injection system and use of DEF help improve fuel efficiency and reduce emissions, making these engines a popular choice for commercial vehicles.



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