Fuel Pump Power: Understanding The 340Lph Limit

how much power can a 340lph fuel pump support

The Aeromotive 340 HP is a high-output, compact, lightweight, in-tank, electric fuel pump that fits most popular EFI applications. It delivers superior flow throughout a wide pressure range, boasting over 30% more flow when compared to a typical 255 at 40 psi. While the 340lph fuel pump is considered to be overkill for a 300hp engine, it is rated for up to 700rwhp with a supercharger or turbo. In fact, some users have reported making over 1000whp on E85 with three 340lph pumps. However, it's important to note that fuel line and rail size should be considered when aiming for such high power outputs.

Characteristics Values
Flow 340 LPH+ (90 US GPH) @ 43 PSI @ 13.5V (min) (375 LPH nominal)
Compatibility Gasoline, up to 100% Ethanol
Diameter 38mm / 1.54" O.D.
Power 500 horsepower
HP Rating 700rwhp with a supercharger or turbo
Injector 72 lb/hr (presuming V-8 engines)
Fuel Pressure 40 PSI base fuel pressure
Boost 20 PSI
Fuel Line Size Equivalent to AN-06
High-Flow Filter Aeromotive 12301
Fuel Rail High flow
Return Line AN-06

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The 340LPH fuel pump is rated for up to 700rwhp with a supercharger or turbo

The 340LPH fuel pump is a high-performance component, rated for up to 700rwhp with forced induction setups, such as superchargers or turbochargers. This rating is supported by real-world testing, where users have reported achieving impressive power figures with the 340LPH pump.

The 340LPH fuel pump is a popular choice for enthusiasts seeking to enhance their vehicles' performance, especially in the context of Ford Mustangs. This pump is often paired with other performance-oriented modifications, such as aftermarket fuel rails, to ensure adequate fuel delivery at higher power outputs.

The pump's ability to support up to 700rwhp is notable, as it strikes a balance between performance and cost. While some higher-horsepower setups may opt for more powerful fuel pumps, the 340LPH pump offers a sweet spot for those aiming for the 600-700hp range. This power level is considered by many enthusiasts to be the sweet spot for a fun and engaging driving experience, offering ample power without sacrificing drivability.

To ensure optimal performance with the 340LPH fuel pump, it is essential to consider the entire fuel delivery system. This includes factors such as fuel injectors, fuel pressure, and electrical supply. By optimizing these variables, the pump can reliably support the rated power output and provide a robust foundation for performance-oriented builds.

In conclusion, the 340LPH fuel pump, rated for up to 700rwhp with forced induction, is a versatile and powerful option for automotive enthusiasts. Its capabilities, combined with its compatibility with superchargers and turbochargers, make it a popular choice for those seeking a balance between performance and cost-effectiveness.

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The pump is compatible with gasoline and up to 100% ethanol

The 340LPH Fuel Pump is a high-pressure, high-volume pump that can flow 340 litres per hour (LPH) at 43 pounds per square inch (PSI) and 13.5 volts. It is designed for in-tank use and features a submersible design with a reliable and quiet turbine impeller.

The 340LPH Fuel Pump can be used with EFI (electronic fuel injection) or carbureted applications and may also be suitable for pulse modulated systems (PWM). It offers plug-and-play compatibility with its standard Walbro-type electrical connector, allowing easy integration with pre-existing wiring setups.

When considering the power supported by the 340LPH Fuel Pump, it is rated for up to 700 rear-wheel horsepower (RWHP) when combined with a supercharger or turbocharger. This rating indicates the pump's ability to deliver fuel at a sufficient rate to support high-performance engines.

To ensure optimal performance and durability, it is important to follow the installation guidelines provided by the manufacturer, including the use of appropriate fuel lines, filters, and regulators.

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The pump is suitable for use with EFI or carbureted applications

A 340LPH fuel pump can support up to 700rwhp with a supercharger or turbo. The pump is suitable for use with EFI or carbureted applications.

EFI, or Electronic Fuel Injection, is a system that consists of two main compartments: low pressure and high pressure. The low-pressure part includes the fuel tank, fuel pump, heater, cooler, and fuel filter, while the high-pressure part is responsible for delivering pressurised fuel to the engine. EFI systems have largely replaced carburetors in cars and trucks since the 1990s due to their ability to handle higher pressures and deliver more precise fuel injection.

Carbureted engines, on the other hand, use a carburetor to control and mix air and fuel entering the engine. Carburetors work on Bernoulli's principle, which states that the static pressure of the intake air at the fuel entry point reduces at higher speeds, causing more fuel to be drawn into the airstream. While carbureted engines are still used in small engines such as lawnmowers and motorcycles, they are not pressurised, which limits their ability to handle high-pressure applications.

When using a 340LPH fuel pump with a carbureted application, it is important to ensure that the fuel lines are properly configured. A large return line is necessary to prevent back pressure from building up. Additionally, the entire carburetor must be contained in an airtight pressurised box if the intake air travelling through it is pressurised, such as when the carburetor is downstream of a supercharger.

In both EFI and carbureted applications, it is crucial to monitor fuel temperature and pressure to prevent issues such as cavitation and vapor lock. By ensuring the correct fuel system design and installation, as well as maintaining clean supply lines and inlet filters, the 340LPH fuel pump can effectively support the desired horsepower rating while delivering reliable fuel flow.

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The pump may be used in pulse modulated systems (PWM)

In a conventional fuel system, the pump is constantly powered at 100% duty cycle, which causes it to wear out relatively early. PWM fuel pumps, on the other hand, have a varying fuel pressure due to controlled electrical operation. The fuel pump speed and pressure are adjusted by increasing or decreasing the length of the electrical pulses being sent to the pump. This allows the pump to meet the minimum and maximum fuel demands of the engine.

The PCM (Powertrain Control Module) senses when the engine is demanding more fuel and commands the fuel pump control module (FCM) to increase the length of the electrical pulses being sent to the fuel pump. Similarly, when the engine's fuel demand decreases, the PCM decreases the length of the electrical pulses.

The pulse width does not change the voltage supplied to the fuel pump. Instead, the pulse width modulation acts like an on-off switch, with the pump being fully powered for a very short period of time, measured in milliseconds. For example, if a 30% duty cycle is required, the pump will be supplied with full power for a very short period of time, and if a 60% duty cycle is required, the pulse width will be twice as long, but the voltage will remain the same.

Overall, the use of PWM in fuel pumps improves the reliability of the system and helps to reduce the likelihood of fuel leaks.

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The pump requires upgraded in-tank and external wiring for proper operation

The 340LPH Fuel Pump is a high-pressure, high-volume pump that can flow 340 LPH or more at 43 PSI. It is designed for in-tank use and can be used with EFI or carbureted applications. It may also be used in pulse-modulated systems (PWM).

To ensure proper operation, the pump requires upgraded in-tank and external wiring. This is because the pump is sold without any wiring, filters, or mounts. Upgrades are necessary to ensure the pump receives an adequate electrical supply to function optimally.

Upgraded wiring is essential for safety and performance. Inadequate wiring can lead to electrical issues, such as insufficient power delivery, which may cause the pump to malfunction or underperform.

When upgrading the wiring, it is crucial to select the appropriate wiring kit that matches the specific requirements of the pump. For example, Aeromotive offers a Premium HD 30-Amp Fuel Pump Wiring Kit that is compatible with their electric fuel pumps. This kit includes a range of connectors, wires, cable ties, and installation tools.

Additionally, when performing any upgrades or maintenance on the fuel pump, it is important to follow safety procedures. This includes never working under a vehicle supported only by a hydraulic jack and always using axle stands or ramps for stability.

Frequently asked questions

A 340LPH fuel pump can support up to 700rwhp with a supercharger or turbo.

The 340LPH fuel pump offers superior flow throughout a wide pressure range, providing over 30% more flow compared to a typical 255 at 40 psi.

While a 340LPH fuel pump can provide benefits in terms of increased flow, it may not be necessary for all setups. It is important to consider the specific goals and variables of your system to ensure that the fuel pump is not excessive or insufficient. Additionally, upgrading to a higher-flow pump may require modifications to wiring and fuel lines to accommodate the increased performance.

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