Anordning och förfarande för läcktestning

摘要

This invention relates to a leak tester for testing the tightness of a test object such as a fuel feed apparatus for an internal combustion engine, and specifically to a leak tester for testing the air tightness of a fuel feed apparatus provided with a first opening and a second opening and having a space portion between the first and second openings. The leak tester is provided with a master (reference chamber) having substantially the same internal volume as the fuel feed apparatus, a pneumatic pressure source for supplying air of a predetermined pressure to the test object through the first opening and also to the master, a differential pressure leak tester for measuring a pressure difference between a pressure of the fluid within the test object and that within the master, and a flow meter for measuring a flow rate of air flowing out of the fuel feed apparatus through the second opening; and the leak tester detects leakage of air from the test object other than that through the second opening on a basis of the pressure difference and the flow rate.