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Fuel Rail Depressurization System For Reducing Evaporative Emissions From A Vehicle

IP.com Disclosure Number: IPCOM000009681D
Publication Date: 2002-Sep-10

Publishing Venue

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When a vehicle having an engine fueled by a gaseous fuel, such as compressed natural gas, hydrogen, or liquid petroleum gas, is inactive, the high residual pressure in the fuel rail inevitably bleeds down through the fuel injectors during the inactive period. Another factor leading to further fuel leakage across the injectors is the diurnal temperature changes that cause a change in system pressure. Fuel leaked through the injectors into the intake manifold escapes to the atmosphere via the air induction system.