BMW G8x M3, M4 & G2x M340i, M440i Stand Alone Auxiliary Fuel System

The Precision Raceworks BMW G8x M3, M4 & G2x M340i, M440i 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 which 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

Models & Configurations

•  AFS.425
  The AFS.425 dedicated auxiliary fuel system comes with all** necessary components to provide dedicated fuel system for port injection.  Featuring a single Walbro 450 (F9000274) fuel pump which flows 425LPH at 3 bar.

•  AFS.460
  The AFS.460 dedicated auxiliary fuel system comes with all** necessary components to provide dedicated fuel system for port injection.  Featuring a single Walbro 535 (F9000295) fuel pump which flows 460LPH at 3 bar.

•  AFS.640
  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.

•  AFS.745
  The AFS.745 dedicated auxiliary fuel system comes with all** necessary components to provide dedicated fuel system for port injection.  Featuring One Walbro 450 (F900074)  & One Walbro 535 (F9000295) fuel pumps with a combined flow of 745LPH @ 3bar.

•  AFS.800
  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.

*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)

Fitments

• Bmw M3 2021 to 2024
• Bmw M340i 2019 to 2024
• Bmw M4 2021 to 2024
• Bmw M440i 2020 to 2024

Specifications

AFS.425

• Pump flow 43.5psia : 425lph
  
• Recommended base pressure: 43.5psig
• Maximum Fuel Pressure: 110psig
• Number of Fuel Output Ports: 2
• Number of Fuel Return Ports: 1
• Pump 1: Walbro 450 (F90000274)
• Pump 2: N/A
• Available (unused) Electrical Connections: 4*
  
• Total System Weight:

AFS.460

• Pump flow 43.5psia : 460lph
  
• Recommended base pressure: 43.5psig
• Maximum Fuel Pressure: 110psig
• Number of Fuel Output Ports: 2
• Number of Fuel Return Ports: 1
• Pump 1: Walbro 535 (F90000295)
• Pump 2: N/A
• Available (unused) Electrical Connections: 4*
  
• Total System Weight:

AFS.640

• Pump flow 43.5psia : 640lph
  
• Recommended base pressure: 43.5psig
• Maximum Fuel Pressure: 110psig
• 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:

AFS.745

• Pump flow 43.5psia : 745lph
  
• Recommended base pressure: 43.5psig
• Maximum Fuel Pressure: 110psig
• Number of Fuel Output Ports: 2
• Number of Fuel Return Ports: 1
• Pump 1: Walbro 535 (F90000295)
• Pump 2: Walbro 450 (F90000274)
  
• Available (unused) Electrical Connections: 2*
  
• Total System Weight:

AFS.800

• Pump flow 43.5psia : 800lph
  
• Recommended base pressure: 43.5psig
• Maximum Fuel Pressure: 110psig
• 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:

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need proof of purchase.

To start a return, you can contact us at palenonracing@gmail.com. If your return is accepted, we’ll send you instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

You can always contact us for any return question at palenonracing@gmail.com.

Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exceptions / non-returnable items
Certain types of items cannot be returned, Burger Motorsports does not allow returns, custom products (such as special orders or personalized items), JB4 Tuners and air filters can not be returned. We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.

Unfortunately, we cannot accept returns on sale items or gift cards.

Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. Certain circumstances will require a restocking fee of up to 25% at the discretion of Palenon Performance. (Examples of these circumstances include but are not limited to multiple failed delivery attempts, modified or damaged products and packaging, etc.) If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.

Handling

If the item is shipping from us direct, you will receive a tracking number within 1 business day. Most orders fulfilled at our warehouse will ship the same business day if ordered by 12pm MST. If the item is being drop shipped from the manufacturer, we cannot guarantee a tracking number within 1 business day. If an item is being drop shipped, we cannot guarantee the 24 hour (1 business day) processing time. A purchase of expedited shipping at checkout means that once item is ready to ship, it will ship using the upgraded shipping method. Some manufacturers require 3-5 days to process orders. Purchasing expedited shipping may speed up the processing time of your order, but we cannot make any guarantees in relation to faster processing time on the manufacturer’s end.

Cancellations

If you used a credit/debit card or PayPal to place an order and decide to cancel or return your order for any reason, a 5% merchant fee will be passed along to you (8% for Shop Pay installments). Some manufacturers can take up to 7 business days to ship out orders. If an item is out of stock we will reach out to you within 48 hours to confirm you would like to proceed with a preorder. If the item is listed as custom-built/ built to order within the description, or if the ETA or average lead time is visible on the product page at the time of ordering and you are cancelling inside of that ETA/lead time you will be charged the merchant fee. If the cancellation is outside of the time frame the merchant fee will not be charged to you for canceling.