What Are the Symptoms of Vapor Lock in an Engine?

By Staff WriterLast Updated Mar 29, 2020 2:01:53 AM ET

Vapor lock often causes a vehicle to fail to start after the driver shuts it off for a few minutes. It also causes cars to stall in slow traffic, when the engine tends to operate at a higher than normal temperature. The condition is caused by the heat in the engine compartment vaporizing the fuel in the fuel pump and lines.