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Fuel system with intergrated pressure management

  • US 6,474,314 B1
  • Filed: 03/31/2000
  • Issued: 11/05/2002
  • Est. Priority Date: 11/19/1999
  • Status: Expired due to Fees
First Claim
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1. A fuel system for supplying fuel to an internal combustion engine of a vehicle, the fuel system comprising:

  • a fuel tank having a headspace;

    an intake manifold in fluid communication with the headspace;

    a charcoal canister in fluid communication with the headspace;

    a purge valve having a first side in fluid communication with the intake manifold and having a second side in fluid communication with the charcoal canister and with the headspace; and

    an integrated pressure management system including;

    a housing connected to the charcoal canister and defining an interior chamber, the housing defining a signal chamber in fluid communication with the charcoal canister;

    a pressure operable device separating the chamber into a first portion and a second portion, the first portion communicating with the charcoal canister, the second portion communicating with a vent port, the pressure operable device permitting fluid communication between the charcoal canister and the vent port in a first configuration and preventing fluid communication between the charcoal canister and the vent port in a second configuration, the pressure operable device separating the signal chamber from the second portion of the interior chamber; and

    a switch signaling displacement of the pressure operable device in response to negative pressure at a first pressure level in the charcoal canister.

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