Precision Raceworks - M2/M240i (G87/G42) Stand Alone Auxiliary Fuel System

Precision Raceworks Stand Alone Auxiliary Fuel System

Fits BMW G87 M2 / G42 M240i

Take full control of your port injection fueling with the Precision Raceworks Stand Alone Auxiliary Fuel System—the most stable, high-performing low-pressure fuel system available for the BMW G87 M2 and G42 M240i. This system is purpose-built to resolve the limitations of traditional fuel delivery setups, ensuring consistent fuel pressure, higher flow, and precise fueling under any load or boost condition.

Why This System Changes the Game

Modern BMWs equipped with direct injection often need port injection to support big power builds. However, relying on the factory-controlled PWM fuel system can create serious issues—fuel pressure oscillations, inconsistent AFRs, and limited pump output due to the factory controller's logic.

This stand-alone solution eliminates those problems entirely by dedicating a completely independent fuel system solely for port injection. The result? Rock-solid pressure, boost-scalable fueling, less tuning complexity, and higher performance headroom without interfering with the factory DI system.

Features & Benefits

• Billet Aluminum Top Hat – With 3 high-flow fuel ports for optimal routing and performance

• Dedicated Fuel Pump(s) – Operates independently from the factory system for rock-solid port fueling

• Anti-Slosh Design – Optimal pump placement ensures consistent fueling under hard acceleration

• Fully Adjustable Billet Fuel Pressure Regulator – Supports true 1:1 pressure scaling with boost

• E85-Ready – Includes a 10-micron USA-made Microglass fuel filter ideal for ethanol-based fuels

• High-Flow PTFE Feed & Return Lines (AN6) – Smooth bore lines with billet aluminum fittings

• Plug & Play Wiring – OEM-style connectors inside and outside the top hat for a clean install

• Configurable Pump Activation Harness – Customizable to your setup (see install guide)

• Improved Injector Resolution – Smaller injectors flow more with higher precision

• Fully Compatible – Works with all stock or upgraded primary fuel pumps

• Modular Design – Easily expandable for future upgrades

• 100% Ethanol Compatible – Every component is rated for full ethanol use

Models & Flow Ratings

AFS.460

• Single Walbro 535 (F9000295) Fuel Pump

• Flows 460 LPH @ 3 Bar

• Complete kit for dedicated port injection fueling

AFS.800

• Dual Walbro 535 (F9000295) Fuel Pumps

• Flows 800 LPH Combined @ 3 Bar

• All-inclusive setup for high-power applications

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