Fuel-It BMW S55 Stage 4 Fuel System Upgrade Kit - Port Injection + Dual LPFP, E85, 600+ whp - M2 Competition, M3, M4 (F87 F80 F82 F83) FI042

Discontinued item: This listing is kept for reference. If you need a current high-output S55 fueling solution, we recommend the Precision Raceworks BMW S55 High Performance Fuel Pump for M2 Competition, M3 and M4.

FI042 S55 fuelling package - aux injection rail plus twin in-tank pumps for big power on ethanol

Building a serious F8x S55 and want consistent, ethanol-ready fuelling for hard use and daily drivability alike? This Fuel-It package combines manifold-mounted auxiliary injectors with a dual in-tank low side upgrade that is happy on E85. It delivers rock solid supply for aggressive calibrations while keeping OEM manners. Proven headroom for 600 plus wheel horsepower with stock or hybrid turbos on the F80 M3, F82 and F83 M4, and F87 M2 Competition.

We have fitted this setup to customer S55 builds and the feedback has been excellent - smooth idle, predictable fuel pressure under sustained boost and superb consistency on full E content. Exactly what tuners want when chasing reliable gains.

Why enthusiasts choose this S55 fuelling solution

• Headroom for 600+ whp on full corn E85 with factory or upgraded turbochargers
• Flex-fuel friendly hardware - lines, filter and components are compatible with ethanol blends
• Twin in-tank pumps for stable low-side supply at high load - also known as an LPFP upgrade
• Auxiliary manifold injection adds the extra flow direct injection cannot provide at big power
• Return-style system with a 1:1 boost-referenced fuel pressure regulator for consistent control
• Installs without permanent modification in the intake manifold area

What you get in the box

• Auxiliary injection kit
  • Black anodised spacer plate for the intake manifold
  • Black anodised fuel rail
  • Aluminium and stainless hardware
  • Six Bosch 750 cc flow-matched injectors
  • Six BMW OEM gaskets
• Dual in-tank low-side upgrade
  • OEM flex fuel pump
  • Secondary Walbro 450 pump
  • Dual -6 AN ethanol-compatible feed lines
  • Dual input E85-capable fuel filter
• Return conversion
  • 1:1 boost-referenced fuel pressure regulator
  • Return line
  • Silicone boost reference hose and fittings

Optional add-ons

• 950 cc injectors
• Ethanol content kit with Bluetooth analyser
  • Continental ethanol content sensor
  • 3/8 inch Cam-Lock fittings
  • Bluetooth analyser - iPhone and Android apps purchased separately

Colour note: Supplied with black intake couplers as standard. If you prefer red or blue, email us after ordering with your order number and preferred colour.

Compatibility

• BMW M3 F80 2012 to 2015 and LCI 2015 onwards
• BMW M4 F82 2013 onwards including LCI
• BMW M4 F83 Convertible 2013 onwards including LCI
• BMW M2 Competition F87 2019 onwards

Engine: S55. Platform: F8x.

Popular searches

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Fitting and support

Professional installation is strongly recommended. MJ Modifications offers fitting in Warwickshire - request a quote at info@mjmodifications.co.uk.

Port Injection Controller guides are available from the manufacturer: https://www.fuel-it.com/port-injection-controller/

Pre-dispatch compatibility check

We verify fitment before shipping. Please include your UK registration or the last 7 digits of your VIN at checkout.

Important notes

• For off-road use only
• Ethanol sensors infer ethanol content by the absence of petrol - contaminated fuel may elevate readings

Part number

FI042

Brand

Fuel-It