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Your Vehicle BMW F36 440i B58 3.0L

BM3 FlexFuel Kit - OEM Fuel Hat Location

A plug-and-play solution to add Flex Fuel capability to your BMW!
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Bootmod3
Mfg Part #
BM3FLEXFUELKT
ECS Part #
ES#4873501
Brand
Bootmod3

649.00
Free Shipping Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
This product is backed by our
Lifetime Replacement Program! Read more here
Availability:
Ships Directly From Supplier
Est. Ship Date:
on Jul 27, 2026
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Does this fit my vehicle?

Product Details

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

We are proud to bring out this truly awesome product that makes getting the required Flex Fuel hardware on your BMW with incredible ease and minimal effort, in your own driveway.

Our kit is entirely plug-and-play with the factory vehicle harness. No cutting or splicing of OEM wiring/connectors. It installs in minutes and can be removed without a trace on the car!

Our team used SolidWorks to design a Flow Optimized Flex Fuel Sensor Adapter (FFSA) to ensure fuel flow is unobstructed and with no added pressure drop at full fuel pump flow from the fuel tank to your motor when our kit is installed. This is important when pushing the factory fuel system with all the power Ethanol can provide over petrol!

Flex fuel sensor housing is designed to neatly install into the factory BMW fuel hat location.

Flex Fuel Sensor Adapter also contains two 1/8 NPT ports that allow installation of an auxiliary Fuel Pressure sensor for vehicles that don’t come with an OEM one from the factory for future use. Depending on fitment, either port can be used.

Install the bootmod3 Flex Fuel Plug and Play Kit and flash your flex fuel enabled bootmod3 OTS MultiMap or Custom Map in minutes and you’re off to the races never worrying about alcohol/petrol blend % in your fuel tank. It does not get better or easier than this!

bootmod3 FlexFuel Plug and Play Kit:

  • Minutes to install at home as opposed to hours at a shop with car up on lift fabricating/cutting into factory fuel lines and splicing/cutting/pinning into OEM electrical
  • 4+ hours in time/cost savings to get going on Flex Fuel as compared to most other kits that require making custom fuel lines, fittings, and custom wiring! 
  • Fully reversible/removable and back to stock without a trace in minutes
  • Custom 3-piece Aluminum-6061 Flex Fuel sensor adapter with built-in sensor bypass to allow for obstruction-free fuel flow made to fit in the vehicle factory fuel hat area below the rear seat
  • All connecting points are sealed with fuel-safe Viton O-rings
  • Flex Fuel Sensor Adapter housing provides additional 1/8 NPT ports for optional Fuel Pressure sensor addition to vehicles without a factory one for bootmod3 CustomROM v2 support
  • CANBUS Enabled Ethanol Content Analyzer (ECA) that integrates with bootmod3 CustomROM for complete and seamless conversion of your BMW to FlexFuel for bootmod3 Flex Fuel enabled OTS MultiMaps and custom tunes with your bootmod3 tuner of choice
  • Power/CANBus 4-wire plug-and-play harness
    • 100% Fully Plug and Play harness to the BMW Fuel Controller connectors (EKP3) on S55, N55 vehicles
    • 100% Fully Plug and Play harness on the BMW Body Domain Controller (BDC/FEM) connector on Gen1 F-series B48/B58
  • Continental Flex Fuel sensor 3-wire harness
  • Custom Aluminum-6061 CANBus Enclosure for the bootmod3 ECA board
  • Custom, kink-free teflon braided line allowing plug-and-play installation with the OEM fuel hat and factory 5/16” or 3/8” fuel feed line. No cutting or new lines required.
  • -6 AN fitting by Racetronix

NOTE: OEM FUEL HAT LOCATION KIT IS INTENDED FOR OEM FUEL PUMP AND ASSOCIATED WIRING. ANY VARIATIONS TO FUEL LINES OR FUEL PUMPS MAY NOT BE COMPATIBLE. USE THE ENGINE BAY INSTALLATION KIT WHERE AVAILABLE INSTEAD.

Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.

This Part Fits the Following Vehicles

Make Model Submodel Engine Special Fitment Notes
BMW G80 M3 S58 3.0L Use vehicle selector to confirm fitment
BMW G80 M3 Competition S58 3.0L Use vehicle selector to confirm fitment
BMW G80 M3 Competition xDrive S58 3.0L Use vehicle selector to confirm fitment
BMW G82 M4 S58 3.0L Use vehicle selector to confirm fitment
BMW G82 M4 Competition S58 3.0L Use vehicle selector to confirm fitment
BMW G82 M4 Competition xDrive S58 3.0L Use vehicle selector to confirm fitment
BMW G83 M4 Competition xDrive S58 3.0L Use vehicle selector to confirm fitment
BMW G87 M2 S58 3.0L Use vehicle selector to confirm fitment
*The above product applications have been written by ECS Tuning. All warranties, product application, fitment, and performance are the responsibility of ECS Tuning. For additional information see the terms of use.

This Product Is Covered By Our Lifetime Replacement Program

Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.

If you have any questions, would like to learn more or are ready to place a replacement claim, click here!

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Return and Exchanges

Need to set up a return? Click here to begin: Return Process

All you need is your order number and email address.


New/Unused Product Returns

ECS Tuning will accept returns for unused products within 90 days of the ship date for a refund to the original payment method used. The customer is responsible for the return shipping costs and fees. If selecting to use a prepaid shipping label, the shipping cost will be deducted from the total refunded amount. All new/unused products must be new, unused and must be in the original packaging, including labeling, manuals, hardware, etc. Special order parts are non-refundable.

In the event that we find an error on our website or on behalf of an ECS Tuning Representative, we will provide a return shipping label from the original delivery location.

Refused Packages

Any domestic orders that are returned to ECS Tuning as refused by receiver or non-deliverable will be subject to a return handling fee and will be processed as a return in compliance with our standard return policy, including a 15% restocking fee.

Any international orders that are refused at the time of delivery will be subject to carrier abandonment of the package, at which time the ordered products would be discarded by the carrier. The customer will not be refunded for the value of the order and the discarded products are no longer retrievable.

Return Process

Return Process

ECS Tuning now offers an online returns solution! To get started, simply log into your ECS Tuning account, Click the "View Orders" button on the My Account home page and select the order that you wish to make a return on to begin. If you have any questions, feel free to reach out to our Customer Service Team for assistance!

Please note: Refunds will be processed to the original payment method used on the order or to an in store credit, respective to the type of return that is made as well as any pre-existing arrangements with an ECS Tuning Customer Service Representative. In the event that multiple forms of payment were used, we will refund the value to an in store credit. In the event that a return label is provided, these charges may be deducted from the total refund you receive.

Original shipping costs are non-refundable and the buyer is responsible for return shipping charges. ECS Tuning will not accept COD deliveries.


All in store credit balances will expire after one year from the original purchase date.

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Shipping Policy

Free Shipping On Orders $49 & Up

Items marked with a 'Free Shipping On Orders $49 and Up' logo may qualify for free standard economy ground shipping to the contiguous United States (48 states) for most orders with a value greater or equal to $49.00 USD. Oversized products and direct ship products are excluded from this offer unless otherwise noted.

Free Shipping

Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.


The policies listed above are subject to change at any time without notice.

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Lifetime Replacement

Want to know more about our Lifetime Replacement program?

Click here to learn more.

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Why You Should Shop From ECS Tuning

ECS Tuning stands out as more than an automotive parts supplier-it's a vibrant community fueled by a shared passion for cars. Born from the enthusiasm of car lovers, we offer an unmatched understanding and commitment to the automotive world, providing high-quality parts and accessories sourced from our own experiences. Our selection is meticulously crafted to meet the highest standards of performance, quality, and design, catering to both the latest trends and classic styles.


Our distinct advantage lies in our passionate team and comprehensive support, offering expert advice and seamless service from selection to installation. Shopping with ECS brings exclusive perks, including our Lifetime Replacement Guarantee and free shipping on orders over $49, enhancing the value of every purchase. As a central hub for car enthusiasts, ECS Tuning fosters a rich community where ideas and experiences flourish, transforming us from a mere supplier into a platform where automotive dreams come to life.

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Cancellation Policy

At ECS Tuning, we understand that plans can change. That's why we offer a flexible cancellation policy for our customers. You may cancel your order at any time before you receive the shipment confirmation. This policy is designed to provide you with peace of mind and the flexibility to make adjustments to your purchases as needed. Should you decide to cancel your order, simply reach out to our customer service team, and we will assist you with the process swiftly and efficiently.

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Manufacturer names and/or part numbers are used only for identification purposes.

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