BMW N54 Upgraded Fuel Pump Dual Walbro 450 and 535 Stage 3.5 LPFP for 1100 WHP

This Stage 3.5 Dual Fuel Pump Kit is a complete plug-and-play low-pressure fuel pump (LPFP) upgrade for N54-powered BMWs and select E-series models. Designed to support up to 1,100 wheel horsepower (950 WHP on full E85), this system delivers the fuel volume needed for high-boost, ethanol-based, or port-injected builds.

The system includes one Walbro F90000274 450LPH pump and one Walbro F90000295 535LPH pump, 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 1,100 WHP (950 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, O-ring, and test plug

Vehicle Fitment:

BMW 1 Series (E82/E88)

• 128i (2008–2013) – N52

• 135i (2008–2013) – N54/N55

• 135is (2013) – N55

• 1M Coupe (2011) – N54

BMW 3 Series (E90/E91/E92/E93)

• 325i, 325xi (2006) – N52

• 328i, 328xi, 328i xDrive (2007–2013) – N52/N51

• 330i, 330xi (2006) – N52

• 335i, 335xi, 335i xDrive (2007–2013) – N54/N55

• 335is (2011–2013) – N54

BMW X1 (E84)

• sDrive28i, xDrive28i (2013–2015) – N20

• xDrive35i (2013–2015) – N55