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Apparatus and method for periodically cleaning a charcoal canister and for periodically checking leak-tightness of a fuel system of an internal combustion engine

  • US 5,975,062 A
  • Filed: 03/11/1998
  • Issued: 11/02/1999
  • Est. Priority Date: 03/11/1997
  • Status: Expired due to Fees
First Claim
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1. Apparatus for cleaning a fuel vapor canister and for testing tightness of a fuel tank unit of an internal combustion engine of a motor vehicle, said engine having an air intake system containing a choke valve, said apparatus comprising:

  • a line connected to the air intake system upstream of the choke valve,a reversible electric air pump in said line,said canister being connected to said line so that in one direction of pumping by said air pump, ambient atmospheric air flows through said canister to the air intake system to clean the canister, andsaid fuel tank unit being connected to said line for being supplied with air from said intake system when said air pump is operated in the other pumping direction to pressurize the fuel tank unit while the canister is isolated from said line.

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