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Dorch Engineering

Dorch Engineering BMW N55 HPFP Plug & Play Adapter Harness (Pre-2014 Early Connector) – PNP Retrofit Wiring Loom/Adaptor Conversion Lead for Stage 1/2 High Pressure Fuel Pump – Fits M2, M135i, M235i, 335i, 435i, 535i, X3/X4 35i, X5/X6 35i

Dorch Engineering BMW N55 HPFP Plug & Play Adapter Harness (Pre-2014 Early Connector) – PNP Retrofit Wiring Loom/Adaptor Conversion Lead for Stage 1/2 High Pressure Fuel Pump – Fits M2, M135i, M235i, 335i, 435i, 535i, X3/X4 35i, X5/X6 35i

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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

Dorch Engineering N55 Early-Connector HP Fuel Pump Adapter Loom

Eliminate connector mismatch when upgrading the fuel system on an early N55. This simple clip-in conversion lead lets pre-2014 cars run a Dorch Engineering Stage 1 or Stage 2 high pressure pump without cutting or soldering. It is an OE-style, direct-fit wiring loom that keeps factory reliability while supporting your performance build.

We have installed these looms in-house and feedback from our customers has been excellent. Fitment is spot on, the connectors lock positively, and the result is a clean, trouble-free upgrade that looks and behaves like factory.

Why choose this adapter loom

  • Plug-in conversion for early N55 connector to updated pump plug
  • No splicing, no coding, no dash lights
  • OE-grade connectors and automotive wiring for durability
  • Designed specifically to pair with Dorch Engineering Stage 1 and Stage 2 HP fuel pumps
  • Ideal solution for pre-14 N55 builds needing a painless fuel system upgrade

Who needs it

Built for BMW N55 vehicles produced before 2014 that require the early-connector to late-pump adapter when fitting a Dorch Engineering high pressure pump. If your car is late 2013 or early 2014, contact us so we can confirm the correct loom before you order.

Vehicle coverage

  • F87 - M2
  • F20/F21 - M135i, M135ix
  • F22/F23 - M235i, M235ix
  • F30/F31/F34 - 335i, 335ix
  • F32/F33/F36 - 435i, 435ix
  • F10/F11 - 535i, 535ix
  • F25/F26 - X3/X4 35ix *
  • F15/F16 - X5/X6 35i and 35ix
  • E82/E88 - 135i *
  • E90/E91/E92/E93 - 335i and 335xi *
  • E84 - X1 35ix *
  • E70/E71 - X5/X6 35i and 35ix *

* 2013 and newer with OE Bosch high pressure pump

Please note: not compatible with 2011 to 2012 N55 vehicles.

What you get

  • Pre-terminated adapter harness - ready to install

Fitting and support

Professional installation available at MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Compatibility check before dispatch

For peace of mind, we verify fitment before shipping. Add your UK registration or the last 7 of your VIN at checkout and we will confirm you receive the correct loom.

Part number

DE-55-1001-Harness

Manufacturer and warranty

Manufacturer: Dorch Engineering

Warranty: Dorch Engineering Lifetime Warranty

Search-friendly terms

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