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Fuel vapor treatment system

  • US 20030051541A1
  • Filed: 09/13/2002
  • Published: 03/20/2003
  • Est. Priority Date: 09/17/2001
  • Status: Active Grant
First Claim
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1. A pressure-changing device for a leak check system to check leak in the fuel vapor treatment system, which adsorbs fuel vapor forming in a fuel tank by adsorbent in an adsorption vessel and discharges the adsorbed fuel vapor into a suction pipe, by changing pressure in a fuel vapor path through which fuel vapor passes in the fuel vapor treatment system, the pressure-changing device comprising:

  • a pump that changes pressure in the fuel vapor path;

    an electromagnetic valve that is disposed between the fuel vapor path and the pump and provides a communication between the fuel vapor path and the pump and a communication between the fuel vapor path and the atmosphere; and

    a pressure sensor that is disposed in a communicating path through which the pump communicates with the electromagnetic valve and detects pressure in the communicating path.

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