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In 1986 the fuel injection systems began to appear on the Venezuelan vehicle market. Many foreign papers reported driveability problems when the injectors reached 10 % of flow restriction because of deposit formation in some vehicles equipped with electronic fuel injection systems. In fact, numerous Venezuelan drivers have complained about some engine problems that they have linked to injector plugging. Many of them have associated the plugging to Venezuelan gasolines. A fleet test was conducted in order to evaluate the effects of using Venezuelan gasolines on injection technologies representative of the country vehicle population. Six vehicles, divided in two groups, according to the injection technology, were tested in field and with dynamometer. Two different technologies were evaluated, a continuous fuel injection system and an electronic multi-port fuel injection system.