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

The AEM 50-1009 external fuel pump is built for built EFI engines that demand constant, reliable fuel 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 making over 1200 HP or turbocharged setups up to 860 HP. Designed as a direct upgrade to the legendary Bosch 044, it features roller vane construction with ceramic plates that reduce friction and wear, guaranteeing lasting performance on track, in drift, or at the drag strip.

Features

• 400 LPH flow at 40 PSI – Supports extreme builds without falling short at any RPM.
• E85/E90 compatible – Internal materials resist 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 brackets and fittings.
• 150 PSI relief valve – Protects the system against pressure spikes that could damage lines or injectors.
• Factory-tested individually – Every unit ships certified to guarantee flow, pressure, and safety.

Technical specifications

• Part number: 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
• Current draw: ~10.7 A @ 40 PSI / ~17.1 A @ 120 PSI
• Recommended voltage: 13.5 V

Compatibility

Optimized for: 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: Electronic fuel injection (EFI) only. Not for carbureted applications.
Use cases: High-horsepower street cars, competition (drift, circuit, drag racing).

OEM references

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

Why choose the AEM 50-1009

Compared to the original Bosch 044 or budget clones, the AEM 50-1009 offers over 60% more flow than stock pumps (200-250 LPH). Thanks to its roller vane design with ceramic plates, it generates less friction heat and keeps fuel density stable even under turbo pressures above 30 PSI, preventing premature failure and guaranteeing consistent supply under full load.

FAQ

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

Can I mount this inside the tank?
This pump is designed for external in-line mounting, though it can be adapted to fuel cells prepared for 60 mm units.

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

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

Shipping & warranty

In stock and ready to ship immediately. Performance warranty backed by AEM Electronics. Buy with complete confidence and secure fuel supply for your built engine.