US 7,320,313 B1
Differential pressure regulator for fuel systems
Akram R. Zahdeh, Oakland, Mich. (US)
Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US)
Filed on Jan. 30, 2007, as Appl. No. 11/668,652.
Int. Cl. F02M 69/54 (2006.01); F02M 69/52 (2006.01)
U.S. Cl. 123—457  [123/514] 14 Claims
OG exemplary drawing
 
1. A differential pressure regulator comprising:
a housing having a first chamber and a second chamber;
a fuel pump inlet in fluid communication with a passage and said first chamber;
a return orifice in fluid communication with said passage and said second chamber;
a movable diaphragm that separates said first chamber from said second chamber;
a first needle valve connected to said diaphragm that is reciprocally disposed in said fuel pump inlet;
a second needle valve connected to said diaphragm that is reciprocally disposed in said return orifice;
a fuel injection supply opening in said first chamber; and
a return opening in said second chamber.