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Test Benches

Merlin Diesel have been manufacturing Diesel Test Benches for over 50 years and we are one of the world's leading Test Bench producers.

We have a range of Diesel Test Benches for the testing of both Diesel Injectors and Diesel Pumps. Our Bench range covers solutions for passenger vehicles, light and medium commercial, Commercial vehicles, Off-Highway, Agricultural and also Rail and Marine.

The types of diesel products our Test Equipment can test is diverse, we cover mechanical pump and Injectors from Bosch inline pumps to single stage Injectors, we have Common Rail benches that will test pumps and Injectors as well as EUI and HEUI.

Not only do we produce our own solutions, we are authorised distributors for Bosch Test Equipment to the diesel network in the UK and Ireland, we are also national distributors for Hartridge Test Equipment similarly in the UK and Ireland. For more information contact:

If you would like to brows our Test Equipment, please click HERE

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A surcharge is like a deposit or refund.

You can send in your old un-wanted injector or pump and we will refund you the surcharge amount you pay at checkout.

When we have inspected your old unit to meet our condition requirements, we will credit you directly into the account of your choice. Please enter your bank account number and sort code on the 'Old Unit Return' form.

Please print and adhere to our ‘Old Unit Return Procedure’ here.

Please re-use the packaging we send out your purchase in, to return the old unit.

If you do not wish to return the old unit the surcharge will become invalid from the date on ‘Old Unit Returns Procedure’


Most modern diesel injectors will need an ECU Correction Code (IMA, C2i-C3i, QR).

When replacing a Diesel Common Rail injector, it is necessary to register the Correction Code, located on the upper part of the injector, into the vehicles ECU.

The Correction Code is used to compensate injector production tolerances, this ensures the ECU balances the injector output to optimise performance and efficiency.