Sylvie Willis
Diesel fuel tanks are an essential component of modern life, powering vehicles, generators, and heavy machinery across various sectors. These robust containers are specifically designed to safely store and dispense diesel fuel, which serves as the lifeblood of countless vehicles and machines. While the primary function of a diesel fuel tank is fuel storage, it also houses several electric parts that are crucial for the overall functioning of the system. From ensuring the precise injection of fuel to maintaining optimal fuel temperature, these electrical components play a vital role in the performance and efficiency of diesel-powered engines.
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What You'll Learn
Fuel injectors
The function of the diesel fuel system is to inject a precise amount of atomized and pressurised fuel into each engine cylinder at the proper time. Fuel injectors deliver a precise amount of atomised and pressurised fuel into each cylinder. This results in increased power and fuel economy, decreased engine noise, and smoother operation.
Modern diesel fuel injectors, such as those found in common rail fuel systems, use piezoelectricity. Piezoelectric injectors are extremely precise and can handle the very high pressures found in common-rail applications. They have fewer internal moving parts than traditional solenoid-type injectors and offer superior control over the injection rate.
The design and engineering of injectors heavily influence the performance of the engine. Fuel efficiency, noise characteristics, and emission levels are impacted by the fuel injector technology and design. Injectors play a critical role in defining engine performance in terms of fuel efficiency, emissions, and longevity.
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Fuel pumps
There are different types of fuel pumps used in diesel fuel systems. One type is the fuel transfer pump, which is driven by the engine and supplies fuel automatically to the diesel injection system. This type of pump often includes a hand primer lever for bleeding air from the system. Another type is the high-pressure fuel pump, which creates the fuel injection pressure externally to the unit injectors.
The PPE Diesel Fuel Lift Pump is another example of a fuel pump used in diesel fuel systems. This pump pushes fuel through the lines and filters, eliminating the possibility of air being drawn into the system and preventing issues like collapsed hoses and fuel restrictions.
Additionally, fuel pumps in diesel fuel systems may be accompanied by fuel filters, which serve as a barrier to contaminants, sediment, and other impurities in the fuel. These filters are typically located between the fuel tank and the engine and should be replaced as part of routine maintenance.
Overall, fuel pumps play a crucial role in diesel fuel systems by ensuring the efficient and reliable delivery of fuel from the tank to the engine, contributing to the overall performance and smooth operation of the vehicle.
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Fuel filters
Most diesel fuel systems employ multiple fuel filters to ensure maximum fuel cleanliness. A typical system might have three stages of progressive filters: a filter screen at the tank or transfer pump, a primary fuel filter, and a secondary fuel filter. In series filters, the fuel passes through one filter and then the other, while in parallel filters, the fuel is split, with a portion going through each filter.
Some fuel filters also incorporate a water separator, which is important as water is a common contaminant in diesel fuel. Water can cause significant issues in injection systems, leading to component seizure, sticky metering components, and governor/metering component failure. Regularly draining and rinsing the water separator can help prevent these issues.
Overall, fuel filters play a critical role in keeping diesel fuel systems operating smoothly and efficiently. By ensuring that only clean fuel reaches the engine, fuel filters help maintain optimal performance and prevent costly repairs.
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Fuel tanks
The manufacturing process of diesel fuel tanks involves cutting and shaping metal parts, welding them together, and applying coatings to prevent leaks and corrosion. The tanks come in various shapes, such as cylindrical, rectangular, and D-style, each designed to balance fuel capacity and aesthetic appeal. Side mounting is the most common placement for diesel tanks on trucks, achieved using brackets or straps.
The size of diesel fuel tanks varies to suit different applications, from compact tanks for pickup trucks to massive tanks for industrial generators. The capacity of these tanks can exceed 25 US gallons, and they are subject to stringent safety regulations regarding spillage, leakage, mounting, and impact survivability. To ensure structural integrity, manufacturers employ techniques like statistical process control (SPC) and perform pressure tests to identify potential leaks.
While diesel fuel tanks are predominantly made of steel due to its durability and corrosion resistance, plastic (high-density polyethylene HDPE) is also used for short-term storage. Plastic tanks are more susceptible to fuel permeation and environmental stress cracking, which can lead to catastrophic failure due to the flammability of diesel fuel. To mitigate safety risks, electrostatic discharges near the tank during refuelling should be avoided, and a vapor recovery system can reduce flammable vapour concentrations.
The diesel fuel system itself consists of several components, including the fuel tank, fuel lines, and fuel injectors. The injectors are considered the most important component, delivering a precise amount of atomized and pressurized fuel into each cylinder. Modern diesel fuel injectors use piezoelectricity, allowing for extreme precision and handling of high pressures. Proper filtration of diesel fuel is also essential, as it typically undergoes multiple stages of filtering to remove contaminants, sediment, and impurities that could damage the engine.
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Fuel injection systems
The performance of diesel engines is heavily influenced by their injection system design. The most notable advances achieved in diesel engines resulted directly from superior fuel injection system designs. While the main purpose of the system is to deliver fuel to the cylinders of a diesel engine, it is how the fuel is delivered that makes the difference in engine performance, emissions, and noise characteristics.
Diesel fuel injectors are arguably the most important fuel system component. The job of the injectors is to deliver a precise amount of atomized and pressurized fuel into each cylinder. Highly atomized, pressurized fuel distributed evenly throughout the cylinder results in increased power and fuel economy, decreased engine noise, and smoother operation. Modern diesel fuel injectors, such as those found in common rail fuel systems, use piezoelectricity. Piezoelectric injectors are extremely precise and can handle the very high pressures found in common-rail applications.
In many diesel engines, an engine-driven fuel pump provides fuel to the fuel injectors via a fuel filter for combustion in the cylinder. The fuel injector is a precision component and has the capability of pumping, metering, and injecting the correct amount of fuel into the combustion chamber. Fuel continually flows in the supply line to the injectors and the excess fuel is returned to the fuel tank through a pressure regulator. The pressure regulator ensures that correct fuel pressure is maintained at the inlet to the injectors.
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Frequently asked questions
Diesel fuel tanks themselves are not typically electric, but they are integral to the fuel system, which includes electric parts. The electric parts in a diesel fuel system include the fuel pump, which is often located inside the tank, and the fuel injectors, which deliver a precise amount of atomized and pressurized fuel into each cylinder.
If your diesel fuel tank is part of a larger fuel system, it likely has electric parts. Fuel pumps and fuel injectors are standard in most diesel fuel systems and are almost always electric.
The diesel fuel tank itself is not electric and is typically made from steel or aluminium. The fuel filter, which keeps dirt and debris from getting into the engine, is also not electric.
