Spool Performance Stage 3 LPFP Low-Pressure/Low-Side Fuel Pump Upgrade for BMW M5 & M6 S63/S63TU (F10 F90 F06 F12 F13) - Dual/Twin In-Tank Lift Pump Kit, High-Flow, E85 Flex-Fuel Compatible, Supports 1200+ WHP

Stage 3 Low-Side Fuel System for BMW M5 and M6 S63 by Spool Performance

Unlock reliable fueling for serious power on your S63-powered M5 or M6. This Stage 3 dual in-tank lift pump setup from Spool Performance is designed for tuned cars running higher boost and ethanol blends, feeding the high-pressure pumps with stable supply so you can chase big numbers with confidence. The secondary pump is staged to come in under load, delivering almost twice the flow of the factory module and supporting 1200+ wheel horsepower on petrol or E85.

At MJ Modifications we run this kit on customer M5 and M6 builds and it has been stellar. Strong low-side pressure, smooth drivability and consistent top-end fueling on ethanol mixes. Our customers love the results, which is why this is our preferred low-side fuel upgrade for hard-driven road and track cars.

Highlights

• Twin in-tank pumps with staged activation under boost for demand-driven flow
• Nearly double the volume of the stock low-side system
• Supports 1200+ whp worth of low-side fueling on petrol and E85
• Eliminates low-side starvation on tuned S63 engines
• Engineered specifically for F10 and F90 M5 plus F06, F12, F13 M6 platforms
• Ideal for cars on ethanol blends, higher boost, and hybrid turbo setups

Why your S63 needs this on big-power setups

As boost targets rise and ethanol content increases, the factory in-tank pump becomes a bottleneck. Upgrading to this Stage 3 low-side solution ensures the high-pressure pumps maintain rail pressure at wide open throttle, improving safety, repeatability and top-end performance. Expect confident fueling for flex-fuel tuning, track days and fast-road use.

Vehicle fitment

• BMW F10 M5 Saloon S63 (2010-2016)
• BMW F90 M5 Saloon S63 (2016+)
• BMW F06 M6 Gran Coupe S63 (2011+)
• BMW F12 M6 Convertible S63 (2011+)
• BMW F13 M6 Coupe S63 (2011+)

Compatibility check

We will verify fitment before dispatch. Please provide your UK registration or the last 7 digits of your VIN at checkout so we can confirm this low-side fuel upgrade is correct for your vehicle.

Fitting and support

Professional installation is recommended. MJ Modifications offers fitting at our Warwickshire workshop. To request a quote or make a booking, email info@mjmodifications.co.uk.

Part number

SP-FX-S63

Manufactured by

Spool Performance

Search-friendly terms

BMW M5 fuel system upgrade, M6 fuel pump kit, S63 low-side fuel pump, high flow lift pump, dual in-tank pump system, ethanol safe fueling, E85 ready, performance fuel delivery, F10 M5 fueling upgrade, F90 M5 fueling upgrade, F06 M6, F12 M6, F13 M6, hybrid turbo fueling support, flex-fuel tuning support, track day fueling, big power BMW S63.