Beatrice Lang
An electric boost pump is an auxiliary pump that delivers fuel to an aircraft's engine before the engine starts. It is usually powered by a self-contained electric motor controlled by the pilot. Electric boost pumps are used to prime the engine before start-up, maintain fuel pressure, suppress vapour formation, and restart the engine if the fuel tanks run dry. They are particularly useful at altitudes above 10,000 feet, where they help prevent fuel cavitation. Electric boost pumps are also used during take-off and landing for safety.
| Characteristics | Values |
|---|---|
| Definition | An aircraft fuel boost pump, also known as an auxiliary electric pump, delivers fuel to the aircraft engine before the engine starts. |
| Function | Used to prime a fuel-injected engine before start-up, restore fuel flow to the engine if the engine-driven pump fails, suppress vapour formation, and aid in restarting the engine. |
| Installation | The most common type of auxiliary fuel pump used on aircraft is the centrifugal pump, which is electric motor-driven and usually submerged in the fuel tank. |
| Safety | The boost pump can be used as a safety precaution during take-offs and landings, and it helps to prevent fuel cavitation at altitude. |
| Performance | The EFII Electric Boost Pump Module offers a new level of installation simplicity and functionality to the fuel system of aircraft with mechanical fuel injection. |
| Maintenance | The shelf and service life of boost pumps is typically 10 years. Overhaul and repair services are available for aircraft fuel boost pumps. |
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What You'll Learn
- Electric boost pumps are used to prime the engine before start-up
- They can also be used to supply fuel if the primary fuel pump fails
- Electric boost pumps can suppress vapour formation, especially at high altitudes
- They can be used as a safety precaution during take-off and landing
- Electric boost pumps are ideal for smaller fuel-injected engines
Electric boost pumps are used to prime the engine before start-up
An aircraft fuel boost pump, also known as an auxiliary electric pump, is used to prime the engine before start-up. It delivers fuel to the aircraft engine before the engine starts and can also be used to supply fuel if the primary fuel pump fails. The boost pump ensures a positive flow of cool fuel through the system, preventing vapor lock.
Vapor lock occurs when the fuel's vapor pressure is too high, causing the fuel to vaporize and creating bubbles and a loss of flow. This can be caused by obstructions in the fuel line, such as elbows, valves, strainers, or fittings, which lower the pressure in the suction line. It can also be caused by high temperatures or low pressure, which can be addressed by using a pump cooling shroud or a pump mounted inside the fuel tank to keep the fuel cool.
The electric boost pump is controlled by the pilot via a switch on the instrument panel. It is recommended to keep the boost pump on during take-off and landing and until the top of the climb to ensure adequate fuel pressure and prevent vapor lock.
Different types of boost pumps are available, such as the centrifugal pump, the single-acting pulsating electric fuel pump, and the wobble pump. The choice of pump depends on the aircraft's engine, fuel metering device, and other components. It is important to ensure that the correct type and size of the electric boost pump are installed to match the specific aircraft's requirements.
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They can also be used to supply fuel if the primary fuel pump fails
An aircraft fuel boost pump, also known as an auxiliary electric pump, is used to deliver fuel to the aircraft engine before the engine starts. It is also used to supply fuel to the engine if the engine-driven or primary fuel pump fails. This is a critical safety feature.
The boost pump is usually powered by a self-contained electric motor, controlled by a switch on the instrument panel. It is important to note that the boost pump should be installed in series with the engine-driven pump. If it is installed without an internal bypass valve, turning off the boost pump will block all fuel flow to the engine-driven pump, causing the engine to shut down.
In some cases, the boost pump may not be able to maintain fuel pressure in the event of an engine-driven pump failure. This could be due to incorrect installation or other factors. It is crucial to determine the correct type of electric pump for your aircraft and ensure proper maintenance to mitigate these risks.
Additionally, the boost pump can aid in other functions, such as suppressing vapour formation, particularly at altitudes above 10,000 feet, and helping to restart the engine if one of the fuel tanks runs dry. The use of the boost pump during take-off and landing is also recommended as a safety precaution.
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Electric boost pumps can suppress vapour formation, especially at high altitudes
An electric boost pump in an airplane is a self-contained electric motor that is pilot-controlled by a switch on the instrument panel. It is responsible for delivering fuel to the aircraft engine before the engine starts and can also be used to supply fuel to the engine if the engine-driven or primary fuel pump fails.
The electric boost pump helps to suppress vapour formation by increasing fuel pressure and restoring liquid flow. It does this by providing a positive flow of cool fuel through the system, which condenses vapour back into a liquid. This is especially important at high altitudes, where the reduced air pressure and increased fuel volatility make vapour lock more likely to occur.
Additionally, the electric boost pump can be used as a safety precaution during take-offs and landings, and it can help restart the engine if one of the fuel tanks runs dry. It is recommended to leave the electric boost pump on until the top of the climb to help stifle any potential vapour lock.
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They can be used as a safety precaution during take-off and landing
An aircraft fuel boost pump, also known as an auxiliary electric pump, delivers fuel to the aircraft engine before the engine starts. It can also be used to supply fuel to the engine if the engine-driven or primary fuel pump fails.
Electric boost pumps can be used as a safety precaution during take-off and landing. They are often used as a back-up pump, installed in line with the engine-driven pump. In the event of an engine-driven pump failure, the electric boost pump can be used to restore fuel flow to the engine. This is particularly important during take-off and landing, when the engine must be supplied with enough fuel to maintain power.
For smaller fuel-injected engines, the boost pump can be used to prevent vapor lock by ensuring a positive flow of cool fuel through the system. Vapor lock occurs when the pressure in the suction line is lowered, bringing the fuel closer to its vapor pressure, resulting in bubbles and a loss of flow. This can be caused by obstructions in the suction pipe, such as elbows, valves, strainers, or fittings. By turning on the boost pump, the cavitation and bouncing needle caused by vapor lock can be stopped.
Additionally, the electric boost pump can be used to aid in starting the engine and maintaining fuel pressure on demand. It can also be used to transfer fuel from tank to tank if the aircraft is designed to do so.
The EFII Electric Boost Pump Module (BPM) is an example of an electric boost pump that can be installed in aircraft equipped with Bendix, AFP, or Precision Airmotive type mechanical fuel injection systems. It is designed to provide superior performance and prevent fuel cavitation at altitude.
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Electric boost pumps are ideal for smaller fuel-injected engines
Vapour lock occurs when the fuel in the lines boils due to low pressure, forming vapour bubbles that can interrupt fuel flow. Electric boost pumps help to prevent vapour lock by ensuring a positive flow of cool fuel through the system. This is especially useful at high altitudes, where low pressure and high temperatures can increase the risk of vapour lock.
Electric boost pumps can also be used during take-off and landing as a safety precaution. By maintaining fuel pressure and flow, the boost pump can help prevent engine stalls during critical phases of flight. Additionally, electric boost pumps can be used to prime the engine prior to start-up, ensuring that there is enough fuel pressure for the engine to start and run smoothly.
The most common type of electric boost pump used in aircraft is the centrifugal pump. It is typically submerged in the fuel tank or located just outside of it, with the inlet extending into the tank. Centrifugal pumps can operate at a single speed or multiple speeds, as selected by the pilot. They ensure positive pressure throughout the fuel system, regardless of temperature, altitude, or flight attitude.
Overall, electric boost pumps offer improved safety, performance, and reliability for smaller fuel-injected engines. They provide a reliable back-up fuel supply, help prevent vapour lock, and ensure adequate fuel pressure and flow during all phases of flight.
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Frequently asked questions
An electric boost pump is an auxiliary fuel pump that delivers fuel to the aircraft engine before the engine starts and can also be used to supply fuel if the engine-driven or primary fuel pump fails.
An electric boost pump can be used for several important functions, including priming a fuel-injected engine before start-up, restoring fuel flow to the engine if the engine-driven pump fails, suppressing vapour formation at altitudes above 10,000 feet, and helping to restart the engine after a fuel tank runs dry.
There are several types of electric boost pumps, including the single-acting pulsating electric fuel pump, the centrifugal pump, and the wobble pump. The most common type is the centrifugal pump, which is electric motor-driven and often submerged in the fuel tank.
Electric boost pumps improve the safety of the aircraft by providing a back-up fuel supply if the primary fuel pump fails. They can also help to suppress vapour formation, especially at high altitudes, and ensure positive pressure throughout the fuel system, preventing vapour lock.
