Patent ID: 8935081
Filing Date: 2015-01-13
Classification: F02M

Abstract:
1. A system for a vehicle, comprising: a first pressure module that receives a signal from a pressure sensor that measures pressure within a fuel vapor purge system, that generates a first pressure based on the signal at a first time, and that generates a second pressure based on the signal at a second time, wherein the second time is after the first time; a purge valve control module that maintains a purge valve in a closed position to seal the fuel vapor purge system from the first time until the second time; a pump control module that operates a vacuum pump from the first time until the second time, wherein the vacuum pump pumps gas out of the fuel vapor purge system when operated; and a blockage indication module that indicates that a blockage is present in the fuel vapor purge system between the pressure sensor and a fuel tank when a difference between the first and second pressures is greater than a predetermined pressure.