








AEM Electronics 400lph Inline High Flow Fuel Pump. 400lph@40psi, 300LPH@120psi. M18x1
400LPH Metric inline high flow fuel Pump
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
- For gasoline vehicles (pump life will be diminished when used with alcohol fuels)
- Kit includes fuel pump, check valve fitting, terminal nuts & boots, instructions
- Compatible with Flex Fuel (E85/E90) and all types of gasoline.
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.
Techinical Specifications
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 Specifications
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), 30 amps (13.5v) MAX
Power rating given at 43 PSI, 13.5v at the pump with a BSFC of .5. Flow capability for horsepower support is ultimately dependent on fuel hose diameter, and system electrical voltage and amperage capabilities.
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AEM Electronics 400lph Inline High Flow Fuel Pump. 400lph@40psi, 300LPH@120psi. M18x1
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Are OEM products more expensive than aftermarket alternatives?
OEM products might have a higher upfront cost compared to aftermarket parts, but their superior quality and durability often make them a more cost-effective choice over time. Investing in OEM ensures you’re getting parts specifically designed for your vehicle, which can lead to better performance and longevity.
Can I purchase OEM parts online or do I need to visit a dealership?
You don’t need to visit a dealership to get OEM parts. You can conveniently purchase genuine OEM components from authorized distributors and reputable online retailers like Turbo Tech Performance. Our online store provides a wide selection of high-quality parts delivered straight to your door.
Are parts from brands like Mopar, ACDelco, and Motorcraft interchangeable between different vehicle brands?
No, parts from Mopar, ACDelco, and Motorcraft are typically designed for specific vehicle brands. It’s crucial to ensure compatibility with your vehicle’s make and model by checking part numbers and consulting with a knowledgeable expert.
Can I install OEM parts myself, or is it better to have a professional handle it?
While some OEM parts can be installed by DIY enthusiasts, the complexity of installation can vary. For the best results and to ensure proper fitment and performance, we recommend having a trained mechanic install the parts, especially if you’re unfamiliar with automotive repairs.
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