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FUEL SYSTEM FOR A MULTI-FUEL ENGINE

  • US 20120167859A1
  • Filed: 01/04/2011
  • Published: 07/05/2012
  • Est. Priority Date: 01/04/2011
  • Status: Active Grant
First Claim
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1. A method of operating a fuel system including a first fuel pump coupled upstream of a second, positive-displacement fuel pump, comprising,when second fuel pump operation is not requested,operating the first fuel pump to maintain a fuel rail pressure at a fuel rail while supplying fuel to an engine cylinder through an injector;

  • andadjusting a degree of operation of the second fuel pump to maintain an elevated pressure in a pump chamber of the second fuel pump below the fuel rail pressure.

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