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FUEL VAPOR EVAPORATIVE SYSTEM VACUUM LEAK TESTING WITH EXTERNAL LEAK AGENT

IP.com Disclosure Number: IPCOM000234171D
Publication Date: 2014-Jan-15
Document File: 1 page(s) / 65K

Publishing Venue

The IP.com Prior Art Database

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FUEL VAPOR EVAPORATIVE SYSTEM VACUUM LEAK TESTING WITH EXTERNAL LEAK AGENT

When diagnosing Fuel Vapor Evaporative Emission System leak concerns that are very small yet cause a system malfunction (diagnostic trouble codes with or without a malfunction indicator lamp), the current diagnostic equipment is sometimes inadequate and minimally successful. These small leaks can be very difficult to locate and result in repeated repair attempts. There are current diagnostics tools that use vacuum to test for a leak, but without the ability diagnose the actual leak location

Current commercially available diagnostic equipment uses pressure to locate the leak (either visual or sonic) while the on board vehicle system uses vacuum to detect the leak. This provides some difficulty in assessing the leak using the current diagnostic equipment because the leak may or may not leak under pressure versus vacuum..

The proposed method would use a vacuum source to pull a detectable agent (non-flammable gas) thru the system to be detected by a diagnostic sensor as a fuel system evaporative system leak source. By placing a sensor on the vehicle and introducing the agent around the seals and components of the fuel evaporative emissions system, you would be testing in the same manner as the fuel system evaporative emissions calibration tests the system. Any leak in the vacuum would draw the agent in, thru the on vehicle systems and then past the sensor (mounted at the vacuum source). Once...