Vapor lock interrupts this supply, causing the engine to run lean. MisfiresĪfter the engine is running, it still needs the right air-to-fuel ratio to continue working as intended. You might notice more trouble when you try to start the vehicle after it has been warmed up. Without the right amount of fuel, the engine can be hard to start. If the vehicle suffers from a vapor lock, it will create an interruption to the fuel delivery. This combination works with the compression and spark to get the motor running. The engine requires a perfectly balanced air-to-fuel ratio to run correctly. The engine needs several things to run correctly, one of which is fuel. Here is a more detailed list of the most common symptoms of a vapor lock: 1. You may also notice issues like a misfiring engine, or performance issues like slow acceleration or rough idle. The most common symptom of vapor lock is a hard starting engine. It can also happen when driving at higher altitudes, or if you run a winter fuel blend in your vehicle once the weather gets warm. If the outside temperature are high enough, or if the engine is running at higher temperatures and the fuel lines are routed too close to the exhaust, vapor lock can result. Vapor lock is caused when your car’s fuel gets too hot and vaporizes. The pump runs cool because it is in the fuel and the system remains pressurized, ensuring there is less likelihood of a vapor lock. With fuel-injected engines, the pump is found in the gas tank. Overall, it runs at lower pressure, and the pump is found away from the gas tank, creating more space for a vapor lock to occur. The reason carbureted vehicles suffer the most is because of the setup. Vapor lock most often happens with older models that contain a carburetor and mechanical fuel pump. With vaporized fuel in the system, it starts to run lean, preventing the proper amount of gas from reaching the engine. Vapor lock occurs when the liquefied fuel gets too hot and vaporizes. Cost to Fix Vapor Lock What is a Vapor Lock in a Car Engine?
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