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Fuel Pump
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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.800 dedicated auxiliary fuel system comes with all** necessary components to provide dedicated fuel system for port injection. Featuring Two Walbro 535’s (F9000295) fuel pumps with a combined flow of 800LPH at 3 bar.
Pump flow 43.5 psi-a : 800 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 535 (F90000295)
Pump 2: Walbro 535 (F90000295)
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)
Rally Road Productions, Inc. is a team supported by a group of people with great abilities in their area of expertise. From the "web guy" and driving instructor friends, to owners of various machine shops, they have surrounded ourselves with people that can be trusted to create and manufacture quality products. This is the key to ensuring everything that they sell will perform as it was intended. The goal is to increase customer satisfaction and make the customization or performance enhancement of your vehicle a more enjoyable venture.
Anyone that has approached the subject of substituting a higher volume fuel pump knows that fitting said pump into a stock housing can be a hassle. What's more is that certain methods can lead to less than safe or reliable results. Enter the Rally Road fuel pump adapter sleeve. This simple adapter makes the installation of a Walbro or Aeromotive fuel pump into the factory sending unit safe, secure and completely functional. The pump rests on a ledge at the bottom of the sleeve and is held tightly in the bracket by a mil-spec stainless steel clamp. A well thought, quality built solution to a common retrofit problem.
Fits Walbro 450lph high volume fuel pumps.
This kit includes:
This part fits the following BMWs
1992-1999 E36 323i 325i 325is 328i 328is
Upgrade your BMW's performance with the BMW Gen2 B58 FX350 Upgraded High Pressure Pump. This high-quality pump is designed to deliver increased fuel pressure, ensuring optimal engine performance and reliability for your BMW.
BMW S55 Stage 3 Low-Pressure Fuel-Pump is an advanced upgrade designed to significantly enhance your vehicle's fueling system. Engineered by Spool Performance, a leader in the BMW Forced Induction industry, this fuel pump provides a substantial increase in fuel flow to support high-performance driving. The Stage 3 Low-Pressure Fuel-Pump more than doubles the flow rate of the stock fuel pump and is fully compatible with E85 fuels. It offers a plug-and-play installation for easy integration and comes with a lifetime warranty for peace of mind.
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
This is a complete Low-Pressure Fuel Pump (LPFP) upgrade that replaces your stock LPFP assembly with a new E85 certified one. The new Walbro 450 pump provides approximately 100% more flow than stock and this assembly can be purchased one of three ways to meet your needs.
Both options include the following:
To be eligible for a core return, the bucket must be completely stock and undamaged. (Pump itself does not have to be functioning)
+ International customers: Due to different emissions requirements, the top portion of your fuel bucket (top hat) is different and doesn't have a large vent tube connection. For this reason, we are no longer sending the top hat to international customers as this often causes confusion. Those customers will simply re-use their current top hat when installing their Stage 2 pump.
- All Stage 2 assemblies are stock buckets that have been rebuilt and may show signs of being disassembled and rebuilt. They are all flow tested and verified before being shipped.
