Excess heat causes the fuel to heat up to the point where it vaporizes in the carburetor, fuel pump or fuel lines. The constant acceleration and deceleration makes your engine work harder, causing it to run hotter than normal. This was just waived after Katrina for the rest of the summer (until 9/15). Vapor lock is most likely to happen when driving on hot days and in stop-and-go traffic. RE the gas can evaporating analogy- that is a real problem and source of airborne hydrocarbons, so the EPA limits the volatility of gas in the summer. This helps winter starts as well as avoids vapor locking during the summer. An exception to this rule is made under 23.951 (2), which states, 'There are means to prevent introducing air into the system. The gas companies make gas evaporate more easily in the winter than the summer. This is done to avoid the possibility of the pump sucking in air from an empty fuel tank, causing vapor lock in flight. Diagnosing a fuel system for vapor lock problems is not a clear-cut process, but you can search for clues that may point to it. Vapor lock is still blamed for intermittent running conditions that go away later, whether or not the diagnosis is correct.įuel injected vehicles keep their fuel under PRESSURE which really keeps the tendency to turn to vapor down. Vapor lock occurs when fuel overheats and vaporizes in a fuel line, carburetor or fuel injector, disrupting the correct air-fuel ratio. Vapor lock is cured by simply letting the car cool down so the gas turns back into a liquid. Pulling a vacuum on that gas increases it willingness to evaporate- so much so that it will turn to vapor in the fuel line particularly in warm weather. An open can of gas left in the sun will vanish faster than the same can full of water. Both injection and carburetion atomizes gas to the extent that it instantly mixes with air in the intake manifold. Gasoline is only too willing to evaporate. Those fuel pumps SUCK the fuel out of the tank. Carbureted cars mostly have the pumps mounted on the back of the engine and they are pumped mechanically by a lump on a cam or somesuch. Injected cars have the pumps inside the tank, powered by electricity, that push fuel towards the motor. From that one sentence you quoted, one cannot conclude the pontiac was carbureted or fuel injected.
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