BMW F-Series N55 N20 Stage 3.5 LPFP – Dual Walbro 450 + 535 Low Pressure Fuel Pump (950 WHP)

Designed to deliver the fuel volume required for high-boost, ethanol-based, or port-injected BMW builds, this Stage 3.5 Dual Walbro 450 & 535 Fuel Pump Kit is a complete, plug-and-play low-pressure fuel pump (LPFP) upgrade for N55, N20, and N26 engines. Capable of supporting up to 950 wheel horsepower (875 WHP on full E85), the system features one Walbro F90000274 450LPH and one Walbro F90000295 535LPH fuel pump in a replacement fuel bucket assembly. A boost-referenced pressure switch (Hobbs switch) automatically activates the secondary pump under load.

All wiring, fittings, and hardware are pre-assembled for a genuine drop-in installation,no splicing, cutting, or crimping required. The assembly arrives fully constructed; simply install it in the vehicle. Compatible with Reflex and Pro EFI controllers and optimized for both stock and modified vehicles.

Key Features:

• Supports up to 950 WHP (875 WHP on E85)

• Dual pump setup: 1x Walbro 450LPH (F90000274) + 1x Walbro 535LPH (F90000295)

• 100% plug-and-play – no cutting or crimping required

• Complete fuel bucket assembly with top hat and float

• Boost-referenced pressure switch (Hobbs switch) included

• E85-compatible

• Works with Reflex and Pro EFI controllers

• Compatible with port injection and upgraded turbo builds

What’s Included:

• One Walbro 450 fuel pump (F90000274)

• One 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

Installation Notes:

• Fully reversible; no permanent vehicle modifications

• Plug-and-play wiring; no harness changes necessary

Vehicle Fitment

1 Series (F20/F21)

• BMW 116i (N13, 2011–2015)

• BMW 118i (N13, 2011–2015)

• BMW 125i (N20, 2011–2015)

• BMW M135i (N55, 2012–2015)

• BMW M135i xDrive (N55, 2012–2015)

2 Series (F22/F23)

• BMW 220i (N20, 2013–2016)

• BMW 228i (N20, 2014–2016)

• BMW 228i xDrive (N20, 2014–2016)

• BMW M235i (N55, 2014–2016)

• BMW M235i xDrive (N55, 2014–2016)

• BMW M2 (N55, 2016–2018)

3 Series (F30/F31/F34)

• BMW 316i (N13, 2012–2015)

• BMW 320i (N20, 2012–2016)

• BMW 320i xDrive (N20, 2012–2016)

• BMW 328i (N20, 2012–2016)

• BMW 328i xDrive (N20, 2012–2016)

• BMW 335i (N55, 2012–2015)

• BMW 335i xDrive (N55, 2012–2015)

• BMW 335i GT xDrive (N55, 2013–2016)

4 Series (F32/F33/F36)

• BMW 420i (N20, 2013–2016)

• BMW 428i (N20, 2014–2016)

• BMW 428i xDrive (N20, 2014–2016)

• BMW 435i (N55, 2013–2016)

• BMW 435i xDrive (N55, 2013–2016)