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Fuel vapor leak check module

  • US 20050044937A1
  • Filed: 08/23/2004
  • Published: 03/03/2005
  • Est. Priority Date: 08/25/2003
  • Status: Active Grant
First Claim
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1. A fuel vapor leak check module for detecting a fuel vapor leakage from a fuel tank, comprising:

  • a canister port which is installed so that the port can be opened to the air and is connected to the interior of the fuel tank through a canister for absorbing fuel vapor produced in the fuel tank;

    a pump means which depressurizes or pressurizes the interior of the fuel tank through the canister port;

    a connecting passage which is coaxially provided in the canister port, is connected to the canister port, and is depressurized or pressurized by the pump means; and

    a standard orifice which is coaxially provided in the connecting passage and reduces the passage area of the connecting passage.

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