PETROL TEST FACILITY, NO DIESEL

1 5

  • Established as one of the oldest ASNU® test and service facilities, we bring 40 years of dedicated automotive industry experience. For the past three decades, we have specialised exclusively in petrol fuel injector diagnostics, servicing, and refurbishment.

    Our Core Services

    • Advanced Diagnostics: Comprehensive petrol fuel injector evaluation and fault-finding.
    • Ultrasonic Cleaning: Deep thermal cleaning to remove carbon deposits and restore performance.
    • Flow & Spray Analysis: Rigorous pattern checking and volume flow testing.
    • Full Servicing: Complete injector overhaul and rebuilding.

    Markets We Serve

    • Modern & Classic Vehicles: Expert care for daily commuters and full restoration of historic injectors from the 1960s onwards, including seized units.
    • Motorsport (including motorcyles): High-precision race engine injector balancing and calibration testing.
    • Marine Engines: Servicing of standard port/side feed, Optimax direct air injectors and hose to rail injectors installed on your boat.
    • Parts & Kits: Retail sales of new and reconditioned injectors, alongside high-quality injector rebuild kits.

    Why Choose Us?

    • 40 Years of trusted automotive engineering experience.
    • 30 Years of specialised expertise in fuel injection systems.
    • Certified ASNU® testing facility ensuring industry-leading standards.

Petrol Injector Servicing

Our world-leading ASNU® diagnostic equipment is the best on the market. We cater for car, marine and motorcycle petrol injectors:

  • Standard port injectors
  • High-pressure injectors (GDI, FSI, etc.)
  • Siemens / Bosch Piezo injectors
  • Side-feed injectors
  • K-Jetronic injectors
  • Single-point injectors
  • Air-assisted injectors
  • Direct air injectors from marine engines
  • Hose-to-rail injectors from the 1960s onwards, including seized injectors
  • Cold-start injectors

A report is provided with every completed service detailing the findings.

Ready to get started? We now run a booking system, so you'll need to reserve a slot. Email your serial numbers (printed on the injectors themselves) to mrinjectorukware@gmail.com for a detailed quote or to secure your booking.

1 3

Are you experiencing any of the following?

  • Poor cold starting
  • Ignition misfiring
  • Flat spots during acceleration
  • High exhaust emissions
  • Poor idling
  • Reduced engine horsepower
  • Increased fuel consumption
  • Engine hesitation

If so, you would likely benefit from an injector service on our world-leading ASNU® petrol injector diagnostic testing and servicing systems.

Taking care of your injectors can prevent engine damage, prolong injector life and help solve your running issues.

While fuel additives and on-car cleaning can help with minor issues, our off-car, multi-step process thoroughly attacks old fuel residues and baked-on carbon deposits, while flushing out internal debris.


Ready to get started? We now run a booking system, so you'll need to reserve a slot. Email your serial numbers (printed on the injectors themselves) to mrinjectorukware@gmail.com for a detailed quote or to secure your booking.

Injector Servicing

Got a Question or Want to Book a Service?

1 3

All Overhaul Kits Dispatched by Master Injector UK

Master Injector UK carries the largest range of petrol (gasoline) fuel injector rebuild kits, with worldwide shipping available.

Our component kits are suitable for CAR, MARINE AND MOTORCYCLE petrol injectors, offering comprehensive compatibility across all major brands, including Bosch, JECS, Keihin, Denso, Siemens, Magneti Marelli, Weber, Delphi, and Continental.

While installing new external parts will not alter the internal performance of your injectors, it is an essential step to ensure they seat correctly within the engine. For classic vehicles, upgrading older polyester or standard rubber fuel lines is now essential. The rising levels of ethanol in today’s forecourt fuels (such as standard E10 petrol) rapidly degrade legacy materials, causing them to crack, leak, or fail. All of our kits feature premium, 100% ethanol-resistant hoses to guarantee a secure seal and eliminate engine fire risks.

If you are experiencing issues with injector functionality or spray patterns, please consider our professional off-car injector diagnostic and cleaning services.

  • In Stock: Filter baskets, seals (rail seals, manifold seals, dust spacers, mid-body, and more), pintle caps, and ethanol-resistant hoses for all petrol injector types.
  • Bespoke Service: Custom component kits can be assembled on request. Please get in touch with your serial numbers (printed directly onto the body of the injectors) to ensure a perfect match.
Overhaul & Seal Kits

Featured Collection

1 10