Running Losses

Running losses refers to the fuel vapors that can escape to the atmosphere during vehicle operation. The fuel tank is the major source of running loss vapors. The fuel pressure regulator with bypass solenoid is equipped on all vehicles. With the engine running, the volume of fuel flowing through the fuel rail is more than the engine can consume. The fuel passing through the fuel rail is heated by the engine and is returned to the tank. Using the bypass type regulator reduces the fuel heating thereby reducing the temperature of the fuel in the tank. This lowers the amount of vaporization that takes place.