BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP
BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP
BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP
BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP
BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP
BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP
BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP
BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP
BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP
BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP

BMW F-Series N55 N20 Stage 3.5 LPFP Upgrade - Walbro 450 + 535 - 950 WHP

OneFastShop SKU: N55STG35LPFP
Price
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Details

BrandOneFastShop
SKUN55STG35LPFP
Manufacturer Part NumberN55STG35LPFP

Product Information

Take your BMW F-Series N55 or N20 to the next level with the OneFastShop Stage 3.5 Dual Walbro 450 + 535 Low Pressure Fuel Pump (LPFP) assembly. Designed for high-boost, ethanol-based, and port-injected builds, this complete plug-and-play LPFP upgrade delivers the fuel volume required to support up to 950 WHP on pump gas or 875 WHP on full E85. Direct replacement for BMW OEM part #16117243975.

The dual pump system pairs a Walbro F90000295 535LPH primary pump with a Walbro F90000274 450LPH secondary pump and includes a boost-referenced pressure switch (Hobbs switch) for automatic secondary pump activation. Arrives fully pre-assembled with all wiring, fittings, and hardware pre-configured - no splicing, cutting, or crimping required. Compatible with Reflex and Pro EFI controllers, and suitable for stock or heavily modified applications.

Specifications

Pumps 1x Walbro 450LPH (F90000274) + 1x Walbro 535LPH (F90000295)
OEM Replacement BMW #16117243975
Max Power Support 950 WHP (pump gas) / 875 WHP (E85)
Secondary Pump Control Boost-referenced pressure switch (Hobbs switch)
Fuel Compatibility 91-93 octane, E85, ethanol blends, methanol injection
Controller Compatibility Reflex, Pro EFI
Installation Plug-and-play, no wiring modifications
Application Port injection and upgraded turbo setups
What's in the Box
  • 1x Walbro 450 fuel pump (F90000274)
  • 1x Walbro 535 fuel pump (F90000295)
  • Complete 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

This part fits:

Year Make Model Chassis Engine
2014-2016 BMW 228i / 228i xDrive F22 / F23 N20
2014-2016 BMW M235i / M235i xDrive F22 / F23 N55
2016-2018 BMW M2 F87 N55
2013-2016 BMW 320i / 320i xDrive F30 N20
2012-2016 BMW 328i / 328i xDrive F30 / F31 N20
2012-2015 BMW 335i / 335i xDrive F30 / F31 N55
2014-2016 BMW 328i GT xDrive F34 N20
2014-2016 BMW 335i GT xDrive F34 N55
2014-2016 BMW 428i / 428i xDrive (incl. Gran Coupe) F32 / F33 / F36 N20
2014-2016 BMW 435i / 435i xDrive (incl. Gran Coupe) F32 / F33 / F36 N55

Wiring and Installation Diagram

The secondary pump activation harness in this kit is configurable for negative trigger (included 13 psi pressure switch or a controller output) or positive trigger (switched 12V). The standard relay is on/off only and must not be driven PWM; use 0 or 100% duty cycle with electronic controllers.

Download the Dual Fuel Pump Activation Harness Installation Diagram (PDF), including step-by-step wiring for Motiv ReFlex+ controllers.

For a full walkthrough of relay, trigger, and controller setup, read our guide: How to Wire a Secondary Fuel Pump on a BMW.

Read before you buy. These guides cover fitment, what to expect, and how to install.

Shipping

  • Orders placed before 3 PM EST typically ship the same business day. Larger items ship within 1 to 3 business days.
  • Standard, expedited, and overnight options at checkout.
  • Oversized items ship by freight and take longer.
  • Special order items follow a lead time we confirm with you individually before the order is committed.
  • Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
  • Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
  • International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

  • 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
  • Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
  • Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
  • Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
  • Product images may be representative. The SKU and specifications in the listing are what ships.
  • Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty
  • 5 stars: 2 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
I
Isaac

Hesitated on the price but I am pushing 800whp+ now and the kit keeps up without issue. Build quality is excellent and the wiring was effectively plug-and-play.

G
Garrett Walker

Going port injection on my N55 build meant I needed every drop of fuel I could move. This kit delivered. Both pumps fire perfectly and there have been no issues four months in.

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