Spare Parts

Over 65,000 part numbers and reference numbers at our disposal


Over 45 years experience

Pumps &

Fully equipped in-house workshop

Injector & Glow Plug Removal

Full range of specialised and universal tools

Common Rail and E.U.I./P.P.D. Spares


  • Bosch - Injector/Pump

    Bosch’s range of injectors apply to most vehicle manufacturers sold worldwide.

  • Delphi - Injector/Pump
    Delphi injectors are fitted to Citroen, Suzuki, Ford, Hyundai, Kia, Jaguar, Renault, Dacia, Nissan, Ssangyong, Peugeot, Mercedes, and Tata.
  • Denso - Injector/Pump
    Denso injectors are fitted to Chevrolet, Citroen, Fiat, Ford, Hyundai, Isuzu, Land Rover, Nissan, Vauxhall, Peugeot, Renault, Lexus, Mazda, Mitsubishi, Subaru and Toyota
  • Siemens (Continental/VDO) - Injector/Pump
    Siemens injectors are fitted to Citroen, Peugeot, Ford, Jaguar, Suzuki, Land Rover, Renault, Volvo, VW, Toyota, Mazda, Seat, Skoda, Audi, Fiat and Nissan
  • Nozzles

    For a diesel engine to function correctly, the injector has to produce atomised fuel at a set pressure and a specific time in the power cycle. To achieve this, the injector nozzle might need to be replaced at some stage if the engine is not performing as economically as it used to or if nozzle replacement is an intrinsic part of a car’s service plan.

    If nozzle replacement is required, like-for-like is a must, otherwise an injector fitted with the wrong spray angle nozzle may cause engine malfunction.

    Our Stock


    Our stock of nozzles covers Bosch, Delphi (CAV), Lucas, Simms, Friedman Maier, Zexel (Dieselkiki), Denso (Nippon Denso), Siemans, and many other manufacturers.

    Pre-common rail, the style of nozzle might be pintle, pintux, needle valve, longstem, and P-type.

    Genuine and good quality replacements are always in stock of this type of nozzle (as well as the common rail type).

    In between pre-common rail and common rail, there was the two-stage style of nozzle, and again these are a stock item.

    With common rail, there are a multitude of variants of nozzle. Please browse our website or call us to find the most appropriate nozzle for your application.

    Fitting the wrong type of nozzle can have quite serious consequences for the performance of an engine.

  • Pilot Valves

    We stock a wide range of pilot valves which form part of the injector units. Pilot valves can fail within injectors because they are manufactured with such high precision and with very high tolerances. With Bosch injectors, we supply valves and valve assemblies that are titanium coated which adds to the longevity and strength of the valve.

    We also stock the Delphi valve, and there is only one valve, which is a genuine Delphi valve, that works effectively.

    There is no requirement for pilot valves on Siemens injectors as they use a fulcrum lever system to actuate the piezo stack.

    With Denso, we stock valves for the most popular applications. Please contact us to further discuss our range and applications.

  • E.U.I. (Electronic Unit Injectors)

    EUI stands for Electronic Unit Injector, and was designed primarily for trucks and it was adopted by Land Rover and VW for passenger cars. Because an EUI can only be electronically controlled when the fuel cavity is pressurised from the camshaft lobe. As Co2 emissions are being further restricted common rail had to be adopted, to continually improve emissions.

    The use of Electronic Unit Injectors has diminished over time as common rail has become the system of choice for most vehicle manufacturers particularly as emissions have been under so much scrutiny in the automotive world. However, some manufacturers such as Scania and Volvo still use EUI for their trucks and heavy commercial vehicle.

    Darwen Diesels stock parts for EUI, as well as exchange units and we test and report for EUI engines.

    If we don’t have stock, we are happy to repair customer units in house. We will also try for a next day service, but this is not always possible depending on the volume of work and access to spare parts.

  • Shims

    Darwen Diesels stock a vast range of shims.

    Shims are used for changing performance parameters on injectors. Shims vary in thickness from 1 micron which is .001mm.

    Diesel fuel injectors vary significantly depending on the manufacturer of the injector and the application. For example, one Bosch injector can have up to 7 types of adjustment which require 7 different shapes or sizes of shim.

    With Delphi there is a button – rather than a shim – ranging from 3mm to 4.9mm. The increments are .05mm between each one.

    With Denso there are 5 shims each affecting different performance characteristics of the injector such as start of injection, ball cup movement, and armature tension.

    With Siemens there are 3 shims and 1 button which include an actuator shim, start of injection and maximum fuel delivery.

    For more details of our range and applications, please contacts us on 01254 53545. We can also send you a catalogue with more details.

  • Tandem Pumps

    A tandem pump can be simply described as a low pressure fuel pump in a diesel engine which also includes a vacuum pump. They are used on engins with unit injectors and supply the fuel to the units.

    A number of lorries on the road today use unit injectors, but smaller commercial vehicles and some cars use unit injectors – particularly cars in the VW group.

    The use of tandem pumps is diminishing in the industry because of tighter emission regulations.

    It is called a tandem pump because it has two functions: the first function is to act as the vacuum pump for the brake servo and the control circuits for the turbo and EGR, the second function is to supply fuel at approximately 8 to 8.5 bar to the galleries in the cylinder head and to the fuel injectors. The injectors are there to pressurise the fuel to very high pressure (2200 bar approx).

    It is a complex and relatively expensive unit to manufacture and was ultimately replaced by the common rail system that has an external delivery injector system replacing the cylinder head galleries and all the other major engineering associated with the manufacturing process.

    At Darwen Diesel we supply tandem pump repair kits, whereas original equipment manufacturers do not. They want you to simply purchase the pump. Our range includes vacuum tandem pump repair kits as well as all of the gaskets and seals you would need for Audi, Seat, Skoda and Volkswagen EUI diesel engine systems fitted to 1.2, 1.4, 1.9, 2.0, 2.5 and 5 litre diesel engines.

    Our range includes complete repair kits as well as metal gaskets, oil seals and torx screws which are available separately.

    If any part associated with vacuum tandem pumps that you are looking for does not appear in our range, please do not hesitate to contact our technical or sales team and we will be only too happy to try to source the part or parts for you.

  • Gasket/Seal Kits

    Here at Darwen Diesels we have an excellent range of Common Rail gasket and seal repair kits.

    Our range includes repair kits for Landrover TD, Bosch, Siemens, Delphi and Denso, including all of the metal gaskets, seals and O rings needed for a full strip down and reassembly.

    Any repair kits or gaskets you need that are not listed on our web site, simply give us a call and our dedicated sales team will try to source that part or kit for you. Our range includes complete repair kits as well as metal gaskets, oil seals and torx screws, which can be ordered separately.

    We also stock:

    • Bosch CP3 Seal Kit
    • Bosch O Ring and Seal
    • CP4 Repair Kit
    • Bosch CP3 Seal Kit
    • Denso HP3 Seal Kit
    • Siemens Pump Repair Kit
per page
Showing 961 - 968 of 968 items
Showing 961 - 968 of 968 items

At Darwen Diesels we pride ourselves on being one of the UK's largest suppliers of common rail spare parts as well as tools and test equipment. The range covers spare parts for rebuilding and reconditioning Common Rail pumps and Common Rail injectors. Our large range of spares includes Nozzles, Seal kits, cap nuts, injector seating washers, leak off connectors, high pressure seals, Pilot valves and more. We also stock a range of conventional type diesel pumps and diesel injectors eg Simms Inline pumps, CAV Inline pumps, DPA Rotary pumps, DPC Rotary pumps, Bosch Rotary pumps, Zexel pumps, Denso pumps and Bryce single cylinder pumps.

Whatever your needs, when it comes to diesel injection spares (parts and assemblies) we have a massive range of over 20,000 part numbers covering all the best known manufacturers including; Firad Nozzles and Corona Diesel Spares.

If you are unable to find a part on our database, please do not hesitate to give us a call and our technical support advisors and sales staff will be only too happy to help you locate that part, or alternatively, if we can possibly source it for you we will.

Can't find what you are looking for?

Please try searching our database using the search below

Still not found what you are looking for?

Call Darwen Diesels on +44 (0)1254 53545

We can source virtually any diesel part!

Or send us a message via our contact form and we will get back to you

  • We hold vast stocks of OE and quality replacement parts
  • We can source virtually any diesel part
  • The largest UK independent distributor of Diesel Fuel Injection components
  • We export our products to worldwide destinations
  • Next day delivery

Please contact me

Special Offer!

10mm multi-fuel injection hose

View Offer


Darwen Diesels / Firad Heavy Duty Machines catalogue

Click here to view

Featured Products