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Demand fuel pressure regulator

  • US 5,458,104 A
  • Filed: 01/14/1994
  • Issued: 10/17/1995
  • Est. Priority Date: 01/14/1994
  • Status: Expired due to Fees
First Claim
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1. A fuel pressure regulator for a no-return fuel delivery system for an internal combustion engine with an air intake manifold and at least one fuel injector, the regulator comprising:

  • a housing, a flexible diaphragm defining in cooperation with the housing first and second chambers, said diaphragm having generally opposed faces with one of the faces communicating with only the first chamber and the other face communicating with only the second chamber, one of the chambers having a passage for continuously communicating with an air intake manifold of an engine, the other chamber having an inlet for supplying fuel to said other chamber and an outlet for continuously communicating with at least one fuel injector of the engine for supplying fuel thereto, a valve associated with said inlet and movable to open and closed positions to control the flow of fuel through said inlet and into said other chamber, an actuator pin carried by one of said diaphragm and said valve for movement therewith for opening and closing said valve, a first spring yieldably biasing said diaphragm toward said valve, so that under normal operating conditions said diaphragm actuates said valve to maintain a substantially constant pressure drop across the injectors, and when said valve closes and the volume of fuel trapped between the injector and said valve expands, the diaphragm moves away and disengages from said valve to accommodate the expansion of the fuel.

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