It’s common to find the mechanical fuel pump on Pontiacs equipped with air conditioning fitted with a third outlet, which returns a limited amount of fuel back to the tank. Its intent is to reduce the risk of vapor lock under certain conditions. Short sections of rubber fuel hose connect the fuel pump to the hard lines, and they flex as the engine shakes or twists under normal driving conditions. The fuel pump inlet, identified with a green clamp, uses a 3⁄8-inch-diameter hose. The return outlet measures 5⁄16-inch and is identified by a red clamp. The red and black wires in the center of the photo are the power and ignition switch leads for the starter. A blue paint marking is visible where the pitman arm connects to the output shaft on the steering box.