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Internal combustion engine dual fuel system

  • US 4,335,697 A
  • Filed: 04/08/1980
  • Issued: 06/22/1982
  • Est. Priority Date: 04/08/1980
  • Status: Expired due to Term
First Claim
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1. An LP gas fuel feed system for an internal combustion engine having an intake for a fuel-air mixture, said fuel feed system comprising a tank containing said LP gas under pressure in a liquid form, first gas conduit means having an inlet disposed in said tank above the level of said LP gas in a gaseous form, second gas conduit means, pressure regulator means between said first and second gas conduit means for reducing the pressure of said LP gas in a gaseous form during passage from said first gas conduit means to said second gas conduit means, an expansion chamber in said second gas conduit means, gas flow modulation means for modulating the flow of said gas through said second gas conduit means as a function of power requirement of said engine, means at the end of said second conduit means for supplying a mixture of said gas and of air at the intake of said internal combustion engine, means for heating said tank, said expansion chamber and at least a portion of said conduit means, and means for maintaining said tank at a predetermined temperature.

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