An evaporative fuel leak diagnosing apparatus for an internal combustion engine, which can detect a pressure of concern with high accuracy with a structure implemented inexpensively while ensuring high accuracy for the detection of fuel vapor. The apparatus includes a computer unit (50A) for fetching...http://www.google.com.au/patents/US6257050?utm_source=gb-gplus-sharePatent US6257050 - Evaporative fuel leak diagnosing apparatus
