Spool Performance Stage 3 LPFP Low-Pressure Low-Side In-Tank Fuel Pump Upgrade Kit - Dual/Twin High-Flow E85 Flex-Fuel - BMW N63/N63TU 550i 650i 750i M850i X5 50i X6 50i (F10 F12 F13 F01 F02 G14 G15 G16 E70 F15 G05 E71 F16 G06) - SP-LS3-N63

Spool Performance Stage 3 Low-Side Fuel System for BMW N63 - Dual In-Tank Lift Pump - Ethanol Compatible - SP-LS3-N63

Push your BMW N63 further with the Spool Performance Stage 3 low-side fuel solution. This high-volume in-tank module uses a dual pump layout to supply serious fuel flow for tuned and hybrid turbo builds, flex-fuel conversions and E85 blends. The secondary pump comes online under boost for seamless delivery when it matters, keeping supply rock solid on spirited road driving and track use.

We run this kit on our own cars and customer projects and it has been brilliant for drivability, pressure stability and headroom. If you are outgrowing the factory in-tank pump on an N63-powered 550i, 650i, 750i, M850i, X5 50i or X6 50i, this is the upgrade that keeps pace with your mapping and hardware.

Why enthusiasts choose this low-side upgrade

• Massive low-side capacity to properly feed uprated high-pressure pumps and bigger turbos
• Dual in-tank design with the auxiliary pump triggered by boost for smooth transition under load
• Almost twice the volume of the OE lift pump for consistent supply on petrol and ethanol blends
• Low-side support for over 1200 whp worth of fueling capacity regardless of fuel type
• E85 friendly components that handle high ethanol content confidently
• Improved pressure stability that helps tuning consistency and keeps trims in check
• Proven reliability and daily-drive manners combined with big power capability

Vehicle applications - BMW V8 twin-turbo N63

• 5 Series
  • F07 F10 F11 550i and xDrive variants
• 6 Series
  • F12 F13 650i and xDrive variants
• 7 Series
  • F01 F02 F03 750i 750Li xDrive plus Alpina B7 models
  • F04 Hybrid 7 models
• 8 Series
  • G14 G15 G16 M850i xDrive
• X Models
  • E70 F15 G05 X5 50i
  • E71 F16 G06 X6 50i plus X6 Hybrid

Part number

SP-LS3-N63

What makes it a smarter choice

• Delivers the low-side headroom your calibration needs on high boost
• Keeps rail supply happy on flex-fuel and high ethanol content
• Designed for serious street builds and track-focused setups
• A favourite with our customers for its fit-and-forget reliability

Compatibility check before dispatch

We will verify fitment prior to shipping. Add your UK registration number or the last 7 of your VIN at checkout so we can confirm compatibility.

Professional installation

For fitting, we recommend MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Trusted results on the N63 platform

We have installed this Spool Performance Stage 3 low-side kit across multiple N63 cars with excellent feedback. Strong supply, smooth transitions under load and proper headroom for modern calibrations make it a standout choice for power gains with confidence on petrol or E85.

Search terms customers use

BMW N63 fuel pump upgrade, N63 lift pump kit, BMW 550i in-tank pump, 650i fuel supply upgrade, 750i fuel system upgrade, M850i ethanol pump, X5 50i fuel module, X6 50i dual pump, N63TU fuel delivery, flex fuel pump BMW V8, E85 fuel pump BMW, high flow in-tank pump N63, twin in-tank pump kit, Stage 3 low-side fuel system, BMW F10 550i pump upgrade, BMW F12 F13 650i pump, F01 F02 750i fuel upgrade, G14 G15 G16 M850i fuel system, E70 F15 G05 X5 50i pump, E71 F16 G06 X6 50i pump, tuned N63 fueling, big turbo N63 fuel supply.