The tank (102) has a vent line (110) from a fresh air filter (112) to a hydrocarbon filter element (108) e.g. activated charcoal filter. A diagnostic valve (120) permanently arranged between the fresh air filter and the hydrocarbon filter element comprises...

The invention relates to a method for diagnosing a leakage in a vessel, which vessel is provided with an electric pump for pressurising the vessel, a sensor for measuring a drive current used for driving the pump and generating a current signal, an electro...

An apparatus for detecting fuel-vapor gas leaks that includes a jet pump (8) that introduces outside air into and pressurizes a vapor purge system including a fuel tank (1) by gasoline flow from a fuel pump (2); an internal pressure sensor (14) for measuri...

A system and method for detecting leakage from a evaporative emission space of an automotive vehicle fuel system. A reciprocating pump is operated in a pressurizing mode to build pressure in the space toward a nominal test pressure. The pressurizing mode i...

A system and method for indicating leakage from a contained volume for holding volatile liquid, such as from an evaporative emission space of an automotive vehicle fuel system. A reciprocating pump operates to build pressure in the space toward a nominal t...