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Application filed by Bosch Gmbh RobertfiledCriticalBosch Gmbh Robert
Priority to TW085105659ApriorityCriticalpatent/TW332241B/en
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Publication of TW332241BpublicationCriticalpatent/TW332241B/en
A pump device, in particular one used in a fuel vaporization prevention system for an internal combustion engine, which comprises a pump diaphragm defining a delivery chamber having a valve device, in which the delivery chamber communicates with the ambient air through a supply passage by using a first valve, and is connected to an absorption filter through a delivery passage by using a second valve, and has a choke valve installed between the supply passage and the delivery passage; which is characterized in that: the pump diaphragm (22) is designed to be driven by an electromagnetic driver (23), and the choke valve (20) is designed to be actuated electromagnetically.
Fuel injection system for internal combustion engine has venting device between pump and filter in form of valve, whereby output of fuel filter is connected to pump input or filter output is connected to further output of the venting device