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

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. They want you to simply purchase the pump. 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.Īt Darwen Diesel we supply tandem pump repair kits, whereas original equipment manufacturers do not. The injectors are there to pressurise the fuel to very high pressure (2200 bar approx). 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 use of tandem pumps is diminishing in the industry because of tighter emission regulations. They are used on engins with unit injectors and supply the fuel to the units.Ī 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. 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.Ī tandem pump can be simply described as a low pressure fuel pump in a diesel engine which also includes a vacuum pump. If we don’t have stock, we are happy to repair customer units in house. However, some manufacturers such as Scania and Volvo still use EUI for their trucks and heavy commercial vehicle.ĭarwen Diesels stock parts for EUI, as well as exchange units and we test and report for EUI engines. 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. As Co2 emissions are being further restricted common rail had to be adopted, to continually improve emissions. Because an EUI can only be electronically controlled when the fuel cavity is pressurised from the camshaft lobe.

EUI stands for Electronic Unit Injector, and was designed primarily for trucks and it was adopted by Land Rover and VW for passenger cars.

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