Patent ID: 6931919
Filing Date: 2005-08-23
Classification: F02M

Abstract:
1. A diagnostic apparatus for a fuel system supplying fuel to an internal combustion engine, the fuel system including a fuel tank having a headspace and a filler occluded by a removable cap, a charcoal canister in fluid communication with the headspace, and an integrated pressure management apparatus having a pressure operable device and a switch signaling displacement of the pressure operable device in response to negative pressure at a first pressure level in the charcoal canister, the diagnostic apparatus comprising: a pressure source to operate the pressure operable device and switch; a first fitting adapted to be occluded by the removable cap, the first fitting being in fluid communication with the pressure source; a second fitting adapted to sealingly engage the filler, the second fitting being in fluid communication with the pressure source and with the first fitting; an orifice being in fluid communication with the pressure source, with the first fitting, and with the second fitting; and a first valve controlling the fluid communication with the orifice.