As we know when engine goes to testing department before that we test it through a semi-automatic setup which is installed on the assembly line converyor to test the oil and fuel leakage of the diesel engine. Now different trials were taken on an engine by using a methodology that includes an ATEQ D520 unit and air pressure regulator for detecting the leakage quantity. Actually ATEQ D520 UNIT is a flowmeter that measures a drop in pressure with a differential sensor.