Patent ID: 7444995
Filing Date: 2008-11-04
Classification: F02D,F02M,F16K,Y10T

Abstract:
1. A system for relieving pressure build up in a vehicle fuel line caused by diurnal heating of the vehicle engine and fuel line when the engine is off, said system comprising: a) a primary valve in fluid communication with said fuel line and operable to open in response to fuel being pumped by a fuel pump through the fuel line leading to the engine, and operable to close in response to the engine and pump being turned off; b) a secondary valve positioned in fluid communication with said fuel line and operable to open in response to fuel being pumped by a fuel pump through the fuel line leading to the engine, and operable to close in response to the engine and pump being turned off, and operable to subsequently reopen upon the pressure in the fuel line decreasing to a valve opening pressure, and thereafter operable to remain open in the presence of pressure build up in the vehicle fuel line caused by diurnal heating of the vehicle engine and fuel line when the engine and fuel pump are off.