Exhaust of Fuel System Loose the exhaust screws Press the plug of oil transit pump until the oil flowing from the connecting area has no air. Loose the connecting nut on the oil sprayer and drive the diesel by using of starting motor to exhaust the air inside the high-pressure oil pipes and tight the connecting nut. Start the diesel. Exhaust the air inside high-pressure oil pipe for one time until the diesel runs smoothly. The diesel oil pressure inside the high-pressure oil pipe is enough to penetrate the skin and result in serious damage. 20-14