BMP Black Market Parts BMW N55 Complete Fueling Kit – F20 F22 F30 F32 (M135i M235i 335i 435i 640i) – Port Injection + LPFP Upgrade – E85 Ready – 750+ whp Support – Bosch Injectors, Walbro 450/525

BMW N55 F-Series Complete Fuel Supply Upgrade, ethanol-safe and proven for 750+ whp

Unlock reliable power on your BMW straight-six with this all-in-one fuel supply upgrade for N55-powered F-series models. Designed for serious road and track builds running larger turbos or hybrid units, this package combines multi-port auxiliary injection with a high-flow in-tank solution for consistent fueling on petrol or ethanol blends. It integrates cleanly, looks OEM, and delivers the capacity your tuner needs for safe, repeatable performance.

We run this setup on our own cars and customer builds, and the feedback has been outstanding for drivability, reliability and outright flow. If you are searching for an N55 fuel system upgrade that simply works, this is it.

Why this kit

• Complete N55 fuel upgrade for F-series cars with OEM-like fit and finish
• Ethanol-ready hardware for E blends including E70 to full E85, ideal for flex fuel tuning
• Auxiliary multi-port injection for stable AFR under boost with big turbo or hybrid turbo setups
• Flow-matched Bosch Motorsport injectors with detailed test certificates for precise calibration
• High-quality AN-6 hose and CNC-machined fittings for a leak-free, ethanol-safe installation
• Optional ethanol content hardware to support flex fuel strategies

Auxiliary multi-port injection

• Stock-runner plate option
  • Includes genuine Bosch Motorsport injectors, flow-matched static and dynamic with paperwork
  • Approximate flow: 750 cc at 3 bar, around 1000 cc at 5 bar, covering roughly 400 whp to 1000 whp depending on setup
• Performance intake manifold in stock location
  • Improved airflow and direct port injection capability while retaining factory fitment
  • Pre-ported for direct port methanol or nitrous should your build require it
  • Supplied with genuine, flow-matched Bosch Motorsport injectors and documentation

Injector control options

• Split Second AIC1-6 additional injector controller, laptop programmable for precise fuel addition across vacuum and boost
• ReFlex controller option for advanced tuning strategies

In-tank fuel pump packages

• Stage 3
  • Hybrid bucketed and external configuration with a primary in-bucket Walbro 450 and a secondary external Walbro 450
  • Supports up to 850 whp, rated at 800 whp on full E85
  • Drop-in solution with wiring and Hobbs switch included, no cutting or splicing
  • Pump part numbers: Walbro F90000274 primary and Walbro F90000274 secondary
• Stage 3.5
  • Hybrid bucketed and external configuration with a primary in-bucket Walbro 450 and a higher flowing external Walbro 525
  • Supports up to 950 whp, rated at 875 whp on full E85
  • Drop-in solution with wiring and Hobbs switch included for dependable activation under boost
  • Pump part numbers: Walbro F90000274 primary and Walbro F90000285 secondary

Fuel lines and fittings

• AN-6 hose upgrade using Aeroquip Socketless hose trusted on ethanol builds worldwide
• CNC-machined 6061 aluminium fittings, anodised for long-term corrosion resistance and ethanol compatibility
• Dual-seal female fitting at the HPFP for a zero-leak connection
• Optional pre-assembled connections for a Continental flex fuel sensor to monitor ethanol content, located neatly under the driver footwell area

What you get

• Auxiliary injection hardware with your choice of stock-runner plate or performance manifold
• Controller options: Split Second AIC1-6 or ReFlex
• In-tank fuel pump package: Stage 3 or Stage 3.5
• Fuel line kit with AN-6 hose and fittings, ethanol safe
• Flow-matched Bosch Motorsport injectors with certificates

Compatibility

Suitable for N55-powered BMW F-series models including:

• F20 F21 M135i
• F22 F23 M235i
• F30 F31 335i
• F32 F33 F36 435i
• F06 F12 F13 640i
• Includes xDrive variants

Fitting and support

Professional installation is recommended. For expert fitting, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Compatibility check before dispatch

To make sure you receive the correct parts, we will run a compatibility check prior to dispatch. Please provide your UK registration number or the last 7 digits of your VIN at checkout.

Part numbers and useful search terms

Walbro F90000274, Walbro F90000285, Bosch Motorsport injectors, AN-6 hose. Common searches and related phrases to help you find this product: BMW N55 fuel upgrade kit, N55 fuel system for F-series, M135i fuel pump upgrade, M235i auxiliary injection, 335i in-tank pump kit, 435i fuel rail upgrade, 640i ethanol fuel system, N55 flex fuel solution, N55 E85 compatible, bioethanol ready, corn fuel setup, high-flow fuel pump, HPFP line upgrade, Continental ethanol content sensor, direct port meth ready, direct port nitrous ready, turbo upgrade fueling, big turbo N55 fueling, hybrid turbo N55 fuel solution.