The oil suction pipe and oil return pipe should be inserted below the minimum liquid level to prevent air bubbles from being generated by splashing of air suction and oil return; The distance between the oil suction pipe and the oil return pipe should be as far as possible, and a baffle should be set between them; In order to keep the oil clean, the oil tank should have a sealed cover plate with an air filter on it. The bottom of the fuel tank should be above l50 mm from the ground; Full attention should be paid to the anti-corrosion treatment of the inner surface of oil tank.