Once the fuel vaporizes in the fuel line, it forms common fuel vapor bubbles that impact the fuel system's overall pressure. Thus, its temperature can escape and help the fuel vaporize faster than another vehicle with an electric fuel pump. Furthermore, the fuel pump is continuously exposed to extreme temperatures from the engine that could reach up to 100 Fahrenheit. This is because the pump sits in a location higher than the fuel tank resulting in pressure issues. On the other hand, in vehicles equipped with mechanical fuel pumps, you'll see that vapor lock occurs more frequently. This is because some vehicles might rely on certain old blended fuels that could reach higher temperatures resulting in vaporizing the fuel.įurthermore, some certain high altitude areas could decrease the fuel boiling point resulting and a higher potential of vapor lock. Keep in mind that it's not rare to see vapor lock in modern vehicles here. Thus, you'll see that fuel lines will not suffer from any vapor lock under ambient temperatures. The cooling fan continuously drops the temperature of the fuel to prevent any vaporization or forming of vapor bubbles within the fuel lines. You also won't see the vapor lock as much in modern vehicles if equipped with a certain electric cooling fan. With the advanced technology and invention of electric fuel pumps, modern vehicles do not have major problems with vapor lock because the pump usually operates at the lowest point of the fuel tank, which allows the fuel to be at low temperatures. However, this characteristic of the volatile fuel caused it to vaporize in the fuel lines and cause vapor lock. This fuel has a lower boiling point to help it mix faster and provide a better combustion without waiting for extended timeframes. Vapor lock occurred mostly in fuel-injected vehicles that rely on a certain type of fuel called the volatile fuel. Thus, you'll see that fuel turns to vapor quicker than it should in older cars. One of the common reasons for vapor lock is that the current fuel system has a lower boiling point than older fuel systems.
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