Temperature responsive demand fuel pressure regulator

摘要

The regulator includes a flexible diaphragm carried within a housing to define first and second chambers on opposed sides of the diaphragm. The first of the housing chambers includes an inlet for connection to a source of fuel under pressure, an outlet for connection to the fuel rail and fuel injectors or other fuel delivery mechanism at the engine, and a valve associated with the inlet and movable responsive to the diaphragm between open and closed positions to control flow of fuel through the first chamber to the engine. A bimetallic element is disposed within the housing coupled to the valve and responsive to temperature of fuel in the housing for positioning the valve in the open position when temperature of fuel in the first chamber reaches a preselected level. Thus, under hot-soak or other high fuel temperature conditions, the fuel rail at the engine is connected directly to the fuel supply line for maintaining elevated fuel pressure and preventing fuel vaporization and possible vapor lock and stall at the engine.