Thomas Group

we know diesel

Visit Diesel Parts Direct

Specialists in diesel fuel injection systems & fuel additives.

Trading for over 40 years

Thomas Group are based in Ashford, Kent and have been in the fuel injection business for over forty years. As a specialist in diesel fuel injection services the company has partnered all the major manufacturers. Beginning with Bosch in 1977, and adding Lucas, Delphi, Denso, Stanadyne, Siemens VDO, Parker Racor, Diesel Forward, Fuel Manager and Hopkins Manufacturing along the way. 

Experience, training and a good knowledge of the latest technology is vital in this industry. From our repair workshops to our parts distribution centre we have that in abundance. Since the company’s early beginnings, technology and emission standards have been revolutionised, from the smoky seventies to today’s tight legislation. This revolution is not yet over, with ever more efficient engines and systems. This makes your fuel system the sophisticated and expensive heartbeat of your engine.

Fuel quality is more important than ever. Modern electronic, high pressure fuel systems must have clean fuel that complies to ISO standards. That means buying good quality fuel and filtration systems. Good fuel will extend the life of your engine and diesel fuel system. We can help with that.

Our ethos is quality. Genuine OE (original equipment) parts, manufacturer training, official tools and software combined with first class customer service. Gaining customer feedback to help us constantly Improve is our continual aim. If you need technical support with a part, we will try to give you the information you need.

Our markets are anywhere you can find diesel fuel injection. That could be construction, marine, agriculture, power generation, rail, cars, trucks and so on.

Our customers are worldwide. With our varied shipping and payment options we try to make buying from us as easy as possible. An on-line trade account will give you access to thousands of products. We will stock what you need, and we will also try to find rare and obsolete parts through our network of contacts.


View All


View All

There has never been a more critical time to look after your fuel

Thomas Group has become known worldwide for its technical expertise and parts sales for diesel fuel injection services & related products within the automotive, off highway, agriculture, plant, power generation, marine and construction Industries.

As an authorised distributor and repairer of OE brands such as Yanmar • Bosch • Delphi • Stanadyne and Denso, we consider ourselves specialists in the very latest common rail diesel injection technology.

Thomas Group brings its substantial diesel experience and knowledge to the Fuel Quality, Fuel Filtration and Fuel Additive sector partnering; Parker Racor • Delphi • Stanadyne • Bosch and Mahle Brands with complete factory support.

Latest Information
Take a look and the latest information-Denso/John Deere injectors-New to range. Click the download button or you can visit our 'Downloads' page for ALL of the parts books and other useful information. Once you have downloaded the leaflet, just click on any of the part numbers to link directly to the relevant page on our web shop.

To become an Account Customer click on the link below to complete the form OR call us on: 01233 642816

Apply to become an Account Customer here


Blog Posts

Some Euro 6 diesel cars are FAILING roadside emissions tests

Article written by Ethan Jupp, MR (Motoring Research) A Driver and Vehicle Standards Agency (DVSA) report suggests a high risk of modern cars failing emissions tests at the side of the road in ultra-low emissions zones (ULEZ), potentially meaning that they shouldn’t be granted ‘free’ access. The issue has been highlighted by Allow Independent Road-testing […]

Read more

Spark plugs: “generation gasoline direct injection”

Bosch reports on the requirements of today’s vehicles In modern spark plugs for gasoline direct injection engines, the centre electrode must be placed into the ignitable mixture. Bosch spark plugs feature precise spark installation depth, projection and indexed ground electrodes for specific direct injection engines as required. New engine concepts – a growing market High […]

Read more

The Thomas Group Companies: