AEM’s 400lph Metric High Flow, high-pressure Inline Fuel Pump (PN 50-1009) is the perfect direct replacement upgrade for 044 pump users who want more fuel flow for their high-performance vehicle!

The 400lph Metric High-Flow Inline Fuel Pump has an M18X1.5 female inlet and M12x1.5 male outlet. It utilizes the industry standard “044 Style” envelope. It is capable of supporting over 1,200 HP normally aspirated and a whopping 860 HP at 30 psi boost!* It flows 400lph (105 gph) at 40 PSI, 340 lph (90 gph) at 73 PSI, and 270 lph (71 gph) at 120 PSI. Complete flow curves from 35 to 120 PSI and current draw vs. fuel pressure charts are available on the Specs tab.

The AEM 400lph Metric High Flow Fuel Pump is rated for use with ethanol-blended fuels, (E85/E90) and all types of gasoline, but pump life will be diminished if used with 100% ethanol fuels.

Designed for high output naturally aspirated and forced induction EFI vehicles
Popular “044 Style” physical configuration with metric fittings for direct replacement of 044 pumps!
Maintains very high flow even at boosted fuel pressures; 340 lph @ 73 PSI (30 psi boost)
Each pump individually tested to flow minimum of 400lph (105gph) @ 40 PSI
Compatible with Flex Fuel (E85/E90) and all types of gasoline (100% Alcohol fuels may diminish fuel pump life)
Kit includes fuel pump, check valve fitting, terminal nuts & boots, instructions

*Power rating given using gasoline and assuming a base fuel pressure of 43 PSI, 13.5v at the pump, 6.2 lbs/gal with a BSFC of 0.65. Boost fuel pressure is assumed to be the base pressure of 43 PSI + boost pressure. Flow capability for horsepower support is ultimately dependent on fuel hose diameter, and system electrical voltage and amperage capabilities.

Your vehicle’s factory fuel pump wiring may not be adequate enough to handle the current draw of AEM’s High Flow Fuel Pump. Please refer to the Electrical Requirements section in the instructions document for proper wiring.

Although AEM’s High Flow Fuel Pumps are the same physical size as many OEM fuel pumps, they may not be appropriate for a specific application. It is imperative that you check the fuel pump sizing for your vehicle before purchasing an AEM High Flow Fuel Pump.

AEM does not condone or approve of the modification of a tank to accommodate a High Flow Fuel Pump and cannot guarantee the pump’s performance or operation if any modifications are made.

Specs

TECHNICAL SPECS:

Weight: 35.8oz (1015 grams)
Outside Diameter: 60mm OD
External Materials: Black plated steel with laser etching
Inlet Fitting: M18X1.5 female
Outlet Fitting: M12x1.5 male
PRV Activation: 150 PSI
Impeller Design: Roller vane with ceramic end plate

VOLTAGE SPECS:

Connector Terminal: 6mm stud positive, 5mm stud negative
Min Voltage Input: 10 volts
Max Voltage Input: 18 volts
Current Draw (40 psi): 9.73 amps no check valve, 10.68 amps with check valve (13.5v)
Current Draw (120 psi): 16.07 amps no check valve, 17.13 amps with check valve (13.5v)
Fuse: 25 amps (13.5v)

* Power rating given at 43 PSI, 13.5v at the pump terminal with a BSFC of .5. Flow capability for horsepower support is ultimately dependent on fuel hose diameter, and system electrical voltage and amperage capabilities.

Rebates

Holley October Promo 10% Off Select Parts Sale

Holley's October Promo 10% Off Select Parts Sale, running from September 28, 2026, through November 1, 2026. For a limited time, customers can save up to 10% off on select Holley parts, making it the perfect opportunity to upgrade your ride with premium Holley branded parts including Holley, Brawler, Quick Fuel, Leg Wheels, Rev Wheels, Rocket Racing, Flowtech, Edge, Racequip, Apr and Dinan. Purchases must be made between September 28, 2026, through November 1, 2026. This limited-time offer applies to qualifying Holley branded parts purchased during the promotional period. Following the promotion, these parts will revert back to standard pricing.

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

WARNING:

Cancer and Reproductive Harm – www.P65Warnings.ca.gov

CARB warning

AEM Electronics 50-1009 Specifications

KEY SPECS
MFG. Part #	50-1009
Brand	AEM Electronics
Electric Fuel Pump Type	External
Free Flow Rate	106 GPH / 400 LPH
Maximum Pressure	120 psi
Voltage	12 volts

GENERAL
Electric Fuel Pump Inlet Fitting(s)	18mm-1.50 Female
Electric Fuel Pump Outlet Fitting(s)	12mm-1.50 Male
Fuel Pressure Regulator Included	No
Sending Unit Included	No
Gasket(s) Included	No
Wiring Harness Included	No
Mounting Bracket Included	No
Mounting Hardware Included	No
Sold in Quantity	Each
GTIN Code	840879025892

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