The Fuel Rail of a Dodge Caravan channels pressurized gasoline to each injector so that a proper spray enters the engine for smooth power delivery and clean emissions. Dodge minivans of the past employed a single Fuel Rail that fed one or two injectors in a throttle body injection unit for an unusual design that replaced carburetors but still resided atop the intake manifold. Subsequent models of the Caravan were transformed to multiport systems. A Fuel Rail runs along the length of the intake runners, supplying port injectors on an individual basis. The regulator maintains the pressure. Meanwhile, the Dodge PCM varies the pulse width depending on whether it is idling or under load. The recent variant of the Caravan models has adopted high pressure common rail style direct injection. This has made it possible to locate the Fuel Rail in the injector assembly to withstand extreme pressures allowing the injectors to mist finer droplets. These fine droplets are sprayed directly into the chambers to ensure better combustion and to use less fuel. The goal of each evolution of Dodge engines was the same, but as the technology on Caravans improved, so did the Fuel Rail layout with every iteration. The mounting position, operating pressure, and the number of injectors have changed over time.
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