BMW F-Series N55 N20 Stage 3.5 LPFP Dual Walbro 450 and 535 Low Pressure Fuel Pump 950 WHP

This Stage 3.5 Dual Walbro 450 and 535 Fuel Pump Kit is a complete plug-and-play low-pressure fuel pump (LPFP) upgrade designed for BMW N55, N20, and N26 engines. Designed to support up to 950 wheel horsepower (875 WHP on full E85), this system delivers the fuel volume needed for high-boost, ethanol-based, or port-injected builds.

The system includes two Walbro F90000274 450LPH fuel pumps, a replacement fuel bucket assembly, and a boost-referenced pressure switch (commonly referred to as a Hobbs switch) for activating the secondary pump. All wiring, fittings, and hardware are included for a true drop-in installation with no splicing or cutting required.

Key Features:

• Supports up to 950WHP (875 WHP on E85)
• Dual Pump Setup: 1x Walbro 450LPH (F90000274) + 1x Walbro 535LPH (F90000295)
• 100% plug-and-play design – no cutting or crimping
• Complete fuel bucket assembly (top hat and float included)
• Boost-referenced pressure switch (Hobbs switch) included
• E85-compatible – ideal for ethanol fuel systems
• Works with Reflex and Pro EFI controllers
• Suitable for builds using port injection and upgraded turbos

What’s Included:

• 1x Walbro 450 fuel pump (F90000274)
• 1x Walbro 535 fuel pump (F90000295)
  
• Replacement fuel bucket with top hat and float
• Boost-referenced pressure switch (Hobbs switch)
• Positive- and negative-trigger wiring harnesses
• BMW secondary fuel pump activation harness
• In-tank filters, fittings, and test plug

Vehicle Fitment:

• BMW 1 Series (F20/F21):
  • 116i (2011 – 2015) – N13
  • 118i (2011 – 2015) – N13
  • 125i (2011 – 2015) – N20
  • M135i / M135i xDrive (2012 – 2015) – N55
• BMW 2 Series (F22/F23):
  • 220i (2013 – 2016) – N20
  • 228i / 228i xDrive (2014 – 2016) – N20
  • M235i / M235i xDrive (2014 – 2016) – N55
  • M2 (2016 – 2018) – N55
• BMW 3 Series (F30/F31/F34):
  • 316i (2012 – 2015) – N13
  • 320i / 320i xDrive (2012 – 2016) – N20
  • 328i / 328i xDrive (2012 – 2016) – N20
  • 335i / 335i xDrive (2012 – 2015) – N55
  • 335i GT xDrive (2013 – 2016) – N55
• BMW 4 Series (F32/F33/F36):
  • 420i (2013 – 2016) – N20
  • 428i / 428i xDrive (2014 – 2016) – N20
  • 435i / 435i xDrive (2013 – 2016) – N55

Installation Notes:

• Fully reversible: no permanent modifications to the vehicle.
• Plug-and-play design: no wiring changes necessary.