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Fuel Injectors and Carburetors
Fuel injectors are designed to accurately meter fuel to the engine and to deliver it in a precise pattern of fine droplets. Because the fuel passages are small, injectors are highly sensitive to small amounts of deposits in the critical regions where the fuel is metered and atomized. These deposits can reduce fuel flow and alter the spray pattern, degrading drivability, decreasing power and fuel economy, and increasing exhaust emissions. Deposits cause similar problems for carbureted engines because carburetors also use a number of small channels and orifices to meter fuel.
 | | Fuel injectors after 10,000 miles with and without high-detergency gas
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Volatility, or the fuel's tendency to vaporize, is the key gasoline characteristic for good vehicle drivability. Drivability describes how your vehicle starts, warms up, runs and performs to your expectations. When the spray pattern of your fuel from the fuel injector is disrupted, the vaporization of the fuel can be negatively affected. That can seriously impact your car's drivability because only fuel vapor actually burns; solids and liquids don't burn at all.
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