Katerina Swanson
The fuel pump is an essential component of a car's injection system, constantly helping the vehicle's fuel circulation. Modern gas engines have a fuel pump located inside the gas tank, which is usually found under the car. To access the pump, an access port is typically located in the trunk or under the rear seat. Diesel-fuelled engines usually have two fuel pumps: a lift pump inside the fuel tank and a high-pressure pump fitted at the engine. The high-pressure pump is integral to the timing gear and is driven by the engine speed connected to the belt.
| Characteristics | Values |
|---|---|
| Location of fuel diesel pump in modern gas engines | Inside the gas tank |
| Location of fuel diesel pump in diesel-fueled engines | Two fuel pumps are fitted: a lift pump inside the fuel tank and a high-pressure pump fitted at the engine |
| Location of in-tank fuel pump | Between the engine and the fuel tank |
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What You'll Learn
Diesel fuel pumps are often inside the fuel tank
Diesel fuel pumps are often located inside the fuel tank. Modern gas engines usually have a fuel pump located inside the gas tank, and diesel-fueled engines typically have two fuel pumps: a lift pump inside the fuel tank and a high-pressure pump fitted at the engine.
The lift pump, also known as the diesel lift pump or fuel transfer pump, is responsible for supplying fuel to the diesel injection system. It is an essential component of the diesel fuel system, which must operate optimally for peak engine performance.
The high-pressure pump, on the other hand, is integral to the timing gear and performs the heavy lifting. Any issues with this pump will quickly become apparent. Replacing this pump typically requires the expertise of a skilled mechanic as it involves removing the timing gear.
The process of accessing and removing the diesel fuel pump can vary. In some cases, the sender unit must be removed first, followed by the fuel line and electrical connections to the pump. The pump may be clipped or fastened with screws, and it is important to count the number of turns when removing the locking ring to facilitate proper refitting.
Additionally, it is crucial to ensure that the fuel pump housing is clean and free of dust and debris before installation to prevent damage to the new fuel pump.
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High-pressure diesel pumps are fitted at the engine
High-pressure diesel pumps are fitted directly to the engine, often within the engine block, and are driven by the camshaft or a dedicated drive shaft. This placement ensures precise alignment with the injectors, which are supplied with fuel at very high pressures. The pump's proximity to the injectors also minimizes the delay between the injection signal and the delivery of fuel to the cylinders, resulting in more efficient combustion.
The pump's location within the engine compartment facilitates direct coupling to the engine, allowing for precise control of fuel delivery. This configuration enables the pump to be driven at a speed proportional to the engine's rpm, ensuring that the fuel injection system operates in sync with the engine's requirements. This mechanical drive system provides a reliable and immediate response, making it a preferred choice over electrical drive systems, which may introduce slight delays due to the time required for electrical signals to transmit commands.
Mounting the high-pressure pump on the engine also ensures that it operates at a similar temperature to the engine itself. This thermal consistency is crucial for maintaining the viscosity and, consequently, the lubricating properties of the diesel fuel. Additionally, the engine's coolant system can be utilized to regulate the temperature of the high-pressure pump, preventing overheating and ensuring optimal performance.
The integration of the high-pressure pump into the engine design allows for a more compact and efficient overall package. This arrangement is particularly advantageous in modern vehicles, where space is at a premium due to the increasing number of components and systems. By locating the pump within the engine, the length of the high-pressure fuel lines is minimized, reducing potential leak points and contributing to a more streamlined design.
Furthermore, the direct mounting of the high-pressure pump on the engine simplifies maintenance procedures. Accessing the pump for service or replacement is more straightforward when it is fitted at the engine, reducing labor costs and downtime associated with maintenance. This design consideration is especially important in commercial vehicles and heavy-duty diesel engines, where minimizing downtime and maximizing service intervals are critical for operational efficiency.
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Electric fuel pumps are mounted inside the fuel tank
The location of a fuel pump depends on the type of fuel injection system used. In modern high-speed diesel engines, a fuel transfer pump is normally used. This pump, driven by the engine, supplies fuel automatically to the diesel injection system. The pump often has a hand primer lever for bleeding air from the system.
In fuel-injected petrol engines, an electric fuel pump is typically located inside the fuel tank. This is known as an "in-tank" fuel pump. For older port injection and throttle-body injection systems, the in-tank fuel pump transports fuel from the fuel tank to the engine and pressurises the fuel to 40-60 psi (3-4 bar).
Since the electric pump does not require mechanical power from the engine, it can be located anywhere between the engine and the fuel tank. One reason that the fuel pump is located inside the fuel tank is to keep the pump cool by submerging it in fuel at the bottom of the tank.
In contrast, mechanical fuel pumps are typically used in engines that use a carburettor, such as in older cars, lawnmowers, and power tools. These pumps operate at a relatively low fuel pressure of 10-15 psi (0.7-1.0 bar). Mechanical pumps are usually located outside the fuel tank, either next to it or elsewhere between the tank and the carburettor.
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High-pressure mechanical pumps are mounted on the engine
Diesel-fuelled engines typically have two fuel pumps: a lift pump fitted inside the fuel tank and a high-pressure pump fitted at the engine. The high-pressure pump is mechanically driven and integral to the timing gear. It is also known as the injection pump, which supplies fuel to the diesel injection system.
There are four primary systems for injecting fuel. The first is an individual pump and injector for each cylinder. The second is a combined pump and injector for each cylinder, known as a unit injector type. The third system is where one pump serves injectors for several cylinders, known as a distributor type. The fourth system uses pumps in a common housing with injectors for each cylinder, known as a common rail system. This final system is gaining popularity for on-road applications.
The high-pressure pump is an essential component of the diesel fuel system, and its optimum operation is critical for peak performance. It operates at a much higher pressure than pumps for non-direct injection engines, up to 30,000 psi (2,100 bar). This high pressure means that any problem with the pump will be quickly noticeable.
Due to the high pressure, replacing the pump can be challenging and is best left to a skilled mechanic. It requires removing the timing gear, and setting the timing incorrectly can cause expensive damage to the engine.
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Diesel engines may have two fuel pumps
Modern high-speed diesel engines typically use a fuel transfer pump to supply fuel to the diesel injection system. This pump is driven by the engine and often includes a hand primer lever for bleeding air from the system. These modern injection pumps are mostly jerk pumps, which use the plunger and cam method of fuel injection.
There are four primary systems for injecting fuel:
- Individual pump and injector for each cylinder: Each cylinder has its own pump and injector.
- Combined pump and injector for each cylinder (unit injector type): A combined pump and injector unit serves each cylinder.
- One pump serving injectors for several cylinders (distributor type): This system uses a single pump to supply fuel to multiple cylinders.
- Pumps in a common housing with injectors for each cylinder (common rail system): This system uses multiple pumps in a shared housing, each supplying fuel to a dedicated cylinder.
The common rail system is becoming increasingly popular for on-road applications, while the in-line and distributor types are commonly used in off-road vehicles and industrial machinery.
Diesel fuel lines, which connect the fuel tank to the injection pump, come in three varieties: heavyweight, medium weight, and lightweight. Heavyweight lines are used for high-pressure applications, such as between the injection pump and injectors. Medium weight lines are used for medium fuel pressures, typically between the fuel tank and injection pump. Lightweight lines are employed where there is little to no pressure. To ensure the smooth operation of the engine, diesel fuel must be filtered multiple times, often through a series of progressive filters.
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Frequently asked questions
The fuel pump in a boat is situated inside the fuel cooler, beneath the port manifold. To access it, you must remove the plastic cover from the motor.
The location of the fuel pump in a car varies depending on the model. For example, to access the pump in a BMW 328i 2012, you need to remove the plastic cover from the motor.
The fuel pump in an aircraft is bolted directly to an accessory pad on the engine crankcase. The fuel tanks are usually located inside the wings.
