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Future diesel engines will require new hardware to reduce emissions to the levels required by upcoming legislation. Advances in the fuel injection equipment (FIE) of the engine are a key enabler towards meeting such legislation. These modern systems produce temperatures and pressures at the injector tips that are considerably higher than those experienced today. This environment can initiate or increase the rate of deposit formation at and around the injector tip compared with current systems. Investigations have been carried out to further the understanding of this phenomenon using experimental nozzles simulating a similar deposit build-up as expected in EU 5 engines. The investigation used a protocol that has recently been released to the industry, commercial 10 ppm S fuel and a commercial diesel fuel detergent. Testing was carried out with both clean and zinc contaminated fuel. Zinc contamination with a fuel soluble salt was used to simulate severe market conditions.