ANTI-POLLUTION FUEL SYSTEM

• US 3,844,264 A
• Filed: 11/09/1972
• Issued: 10/29/1974
• Est. Priority Date: 11/09/1972
• Status: Expired due to Term

• Current Assignee: Lewis M.D. Grainger
• Original Assignee: Lewis M.D. Grainger
• Inventors: Grainger, Lewis M. D.
• Primary Examiner(s): Myhre, Charles J.
• Assistant Examiner(s): Cox, Ronald B.
• Application Number:
  US05/304,933
• Time in Patent Office: 719 Days
• Field of Search: 123/136,120,121 220/85MV
• US Class Current: 123/518
• CPC Class Codes: F02D 33/003 Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus control of electrical fuel pumps F02D41/3082, controlling fuel flow to a common rail F02D41/3845; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
• CPC Class Codes: F02M 37/0047 Layout or arrangement of systems for feeding fuel fuel injection apparatus characterised by their conduits and venting means F02M55/00; fuel injection apparatus having a common rail F02M63/0225; arrangement of fuel conduits of low pressure fuel injection apparatus F02M69/462
• CPC Class Codes: F02M 37/0094 Saddle tanks; Tanks having partition walls
• CPC Class Codes: F02M 37/20 characterised by means for preventing vapour lock

Abstract

An anti-pollution fuel system for use with an internal combustion engine in which the fuel system is completely sealed to prevent the escape of evaporative vapors therefrom. An expansion tank is provided in the sealed system to accept overflow expansion of vapors and/or fuel from the fuel tank with liquid in the expansion tank being returned to the fuel tank as pressure is reduced therein. The gas tank cap is sealed to prevent the flow of expanding gases therethrough and has a one way valve to admit air as the fuel is used from the fuel tank. A magnetic valve in the fuel line between the fuel tank and the fuel pump is automatically closed except when the ignition key is in the on position whereupon it opens to permit the flow of fuel to the fuel pump.

Claims

1. In a normally sealed anti-pollution fuel supply system for a vehicle including an ignition switch and a battery, a fuel tank having a bottom wall, top wall, and side walls extending therebetween, a gooseneck filler pipe connected to said top wall and closed with a removeable cap that is sealed to prevent the flow of gases upwardly through the gooseneck and out to the atmosphere through the cap, a one-way valve positioned in said cap permitting the flow of air inwardly through the cap to the tank to relieve any vacuum occurring therein, a fuel line extending downwardly through the top wall and terminating at a point just above the bottom wall, said fuel line being connected to the center of a tee, an expansion tank supported on the top wall and connected to one side of said tee, a magnetic valve being connected to the other side of the tee, a fuel pump and a carburetor, a fuel line connecting the fuel pump and carburetor to the magnetic valve, the ignition switch of the vehicle being connected in circuit with the battery to the magnetic valve so as to open the magnetic valve whenever the switch is closed and to permit the valve to close whenever the switch is open, a drain line extending from the bottom of the expansion tank to the bottom portion of a side wall of the fuel tank and communicating with the tank adjacent the bottom thereof, said drain line having a one-way valve therein to permit the flow of fuel collected in the expansion tank through the drain line into the tank when the pressure in the tank is low enough to permit a flow into the tank, said cap in addition to permitting a flow of air into the tank as needed, also acting as a safety valve to open outwardly when the pressures in the fuel system become so great as to completely fill the expansion tank.