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Dorch Engineering

Dorch Engineering BMW N55 HPFP O-Ring Seal – Stage 1 & Stage 2 High Pressure Fuel Pump Replacement for M2, 135i, M135i, M235i, 335i, 435i, 535i, X1/X3/X4/X5/X6 35i

Dorch Engineering BMW N55 HPFP O-Ring Seal – Stage 1 & Stage 2 High Pressure Fuel Pump Replacement for M2, 135i, M135i, M235i, 335i, 435i, 535i, X1/X3/X4/X5/X6 35i

£39.90
£42.00 £39.90
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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.

Seal Ring for Dorch N55 Upgraded High-Pressure Pump

Restore perfect sealing on your turbocharged N55 straight-six with this authentic Dorch Engineering seal ring for the Stage One and Stage Two upgraded high-pressure pump. A fresh sealing ring keeps fuel pressure stable, helps prevent petrol smells and seepage, and supports smooth starts and crisp throttle response on both daily drivers and hard‑used track cars.

We use these in our own builds and our customers love the reliability. It is the small, low-cost part that protects your fuel system investment and keeps your tuned BMW performing as it should.

Why this seal ring is a must-have

  • Direct-fit sealing ring for the Dorch N55 Stage 1 and Stage 2 upgraded pump
  • Maintains consistent fuel rail pressure under load for dependable performance
  • Helps stop leaks and fuel odour caused by a tired or flattened O-ring
  • Perfect to install whenever the high-pressure pump is removed or serviced
  • Workshop tested by MJ Modifications with excellent long-term feedback

What you receive

  • 1 x Dorch Engineering pump seal ring for N55 upgraded high-pressure pump

Compatible BMW models with the N55 engine

  • 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 35ix X4 35ix
  • F15 F16 X5 35i 35ix X6 35i 35ix
  • E82 E88 135i
  • E90 E91 E92 E93 335i 335xi
  • E84 X1 35ix
  • E70 E71 X5 35i 35ix X6 35i 35ix

Not sure if this is right for your car? Send us your reg or last 7 of VIN and we will confirm before dispatch.

Fitting service

Professional installation is recommended for any high-pressure fuel component. Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Pre-shipment compatibility check

We verify fitment prior to shipping. Add your UK registration or the final 7 characters of your VIN at checkout so we can ensure you receive the correct N55 pump seal ring.

Manufacturer and warranty

Manufacturer: Dorch Engineering

Warranty: Dorch Engineering Lifetime Warranty

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