AEM External High-Flow Fuel Pump (400 LPH / 1200+ HP) – Bosch 044 Replacement for High-Performance EFI Systems

The AEM 50-1009 external fuel pump is the ultimate solution for built EFI engines that demand a constant, reliable supply even under the most extreme conditions. With a flow rate of 400 liters per hour at 40 PSI, this high-flow pump can feed naturally aspirated engines of over 1200 hp or turbo configurations of up to 860 hp. Designed as a direct upgrade to the legendary Bosch 044, it incorporates roller vanes with ceramic plates that reduce friction and wear, guaranteeing durable performance on the track, in drift or in drag racing.

Features

• 400 LPH flow at 40 PSI – Supports extreme builds without falling short at any engine speed.
• Compatible with E85/E90 – Internal materials resistant to high-octane fuels and ethanol blends.
• 044-style design with metric threads – Direct replacement for the Bosch 044 (0580254044). Physical plug & play installation with standard 60 mm mounts and fittings.
• Relief valve at 150 PSI – Protects the system against pressure spikes that could damage lines or injectors.
• Individually factory-tested – Each unit ships certified to guarantee flow, pressure and safety.

Technical specifications

• Reference: 50-1009
• Nominal flow: 400 LPH (105 GPH) @ 40 PSI
• Flow under boost (73 PSI): 340 LPH (90 GPH)
• Maximum pressure (PRV): 150 PSI
• Inlet: M18×1.5 female
• Outlet: M12×1.5 male (includes check valve)
• Diameter: 60 mm
• Consumption: ~10.7 A @ 40 PSI / ~17.1 A @ 120 PSI
• Recommended voltage: 13.5 V

Compatibility

Optimized models: Nissan Skyline/GT-R, Mitsubishi Lancer Evolution, Subaru WRX/STI, Honda Civic/Integra Turbo, BMW M3/M5, Audi/VW 1.8T and 2.0T.
Systems: Exclusive to electronic fuel injection (EFI). Not valid for carburetion.
Applications: High-power street vehicles, competition (drift, track, drag racing).

OEM References

• Direct equivalent to the Bosch 044 (0580254044)
• Compatible with standard 60 mm pump mounts and fittings

Why choose the AEM 50-1009

Compared to the original Bosch 044 or budget copies, the AEM 50-1009 offers a flow increase of over 60% relative to standard pumps (200-250 LPH). Thanks to its roller vanes with ceramic plates, it generates less heat from friction and keeps fuel density stable even under turbo pressures above 30 PSI, preventing premature failures and guaranteeing a constant supply at full load.

Frequently asked questions

Do I need to modify the wiring?
Yes, installation with a dedicated relay and wiring capable of withstanding 25-amp peaks is recommended.

Can I mount it inside the tank?
This pump is designed for external inline mounting, although it can be adapted in tanks prepared for 60 mm units.

Does it require a pre-filter?
It is mandatory to install a 100-micron pre-filter to protect the internal components and maintain the warranty.

Is it compatible with conventional gasoline?
Yes, it works with 95 and 98 octane gasolines, as well as E85/E90 blends.

Shipping and warranty

Product in stock, ready for immediate shipping. Performance warranty backed by AEM Electronics. Buy with complete confidence and secure the supply for your built engine.