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This product was last offered at the strikethrough price on
03-02-2026
The Precision Raceworks G8x/G2x Stand Alone Auxiliary Fuel System is the highest-performing and most stable low-pressure fuel system on the market! Forget about how things have been done and embrace the benefits of dedicated fueling for your port injection!
Since direct injection came out for BMW, enthusiasts have been adding port injection. With this came the need to upgrade the low-pressure fuel system to keep up. Historically this was done by increasing the output of the main fuel system. Unfortunately, the main fuel pump is controlled using PWM by a factory programmed controller designed to reduce output when target fuel pressure (typically 5 bar) is exceeded, creating a constant battle when pumps are added or upgraded. This limits upgraded fuel pumps from performing to their full potential.
Additionally, the high-pressure pump control system dumps fuel back into the low-pressure system at high pressure low volume resulting in oscillations of the low-pressure fuel system. Because of this, the DI system in the car is required to constantly make corrections to keep target AFR in check.
With this stand-alone low-pressure fuel system dedicated to your port fueling that is a thing of the past! Get rock-solid fuel pressures at any pressure, run fuel pressures that are 1:1 scalable to boost pressure, flow more fuel with dedicated lines, run smaller injectors and still get more fuel than you did with large injectors (allowing for higher resolution), put less demand on the car’s DI system to correct for fluctuations in pressure, even your tuner will be grateful as the system makes tuning of port fueling even easier and more accurate, the list of benefits goes on and on!
Features & Benefits
Billet Aluminum top hat with 3 high-flow fuel ports
Dedicated fuel pump(s) for port injection system
Optimal pump location resistant to fuel slosh under acceleration
Fully adjustable 1:1 scaling billet fuel pressure regulator
10-micron USA made Microglass fuel filter (Ideal for E85)
Smooth bore high flow PTFE fuel feed & return lines (AN6)
All billet connections for both fuel line fittings and top-hat
Plug and play connectors inside and outside* the top hat
Configurable pump activation harness (see instructions for more details)
Increased injector flow (when using 1:1 regulator feature vs static)
Compatible with all stock or upgraded primary fuel pumps
Easily expandable and upgrade-able for more fuel
All components and parts feature 100% Ethanol Compatibility
The AFS.640 dedicated auxiliary fuel system comes with all** necessary components to provide dedicated fuel system for port injection. Featuring Two Walbro 450’s (F9000274) fuel pumps with a combined flow of 640LPH at 3 bar.
Pump flow 43.5 psi-a : 640 lph
Recommended base pressure: 43.5 psi-g
Maximum Fuel Pressure: 110 psi-g
Number of Fuel Output Ports: 2
Number of Fuel Return Ports: 1
Pump 1: Walbro 450 (F90000274)
Pump 2: Walbro 450 (F90000274)
Available (unused) Electrical Connections: 2*
Total System Weight: 14 lbs (including fuel lines and wiring harness)
*At time of install some wiring in the car may need to be cut and spliced to connectors included in this kit
**Male AN8-ORB to Female AN6-ORB adapter may be required for compatibility with some fuel rails (not included in kit)
Don't neglect your motor mounts! Most stock BMW motor mounts are fluid filled and the stiffness of the mount depends on this fluid. But over time the fluid leaks out and the strength of the mount is greatly reduced. A worn motor mount allows the engine to twist and shift around. The harder you're driving the more shift will occur. As the engine is moving around it can contact other parts in the engine bay - usually cooling related. The mechanical fan can hit the radiator; the A/C compressor can hit a radiator hose, the exhaust will flex and may break. Twisting of the engine can also lead to shifting problems as the transmission twists with it. There are countless issues related to worn or compressed motor mounts so don't overlook these as a regular replacement item (every 50,000 miles).
This mount is for the right/passenger's side.
This is a direct replacement for the factory motor mount for M62 V8 engines and M73N V12 engines.
As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!
This item fits the following BMWs:
1997-2003 E39 BMW 540i
1997-2001 E38 BMW 740i 740il
1999-2001 E38 BMW 750il