Posted by jimg.allentown on December 11, 2013 at 19:24:09 from (98.115.105.174):
In Reply to: Car Trouble posted by Poor Farmer 830 on December 11, 2013 at 18:57:25:
Had a similar problem with the evap system on a Buick Rendezvous that turned out to be a broken wire in the harness where it went through the body. Also might want to take a look underneath and see if the vent hose is kinked or punctured. The vent hose is the smaller hose that runs along side the larger fill tube. Might be clogged, melted, twisted, etc. Keep in mind that the Ethanol in today's gas is tough on the rubber parts.
A quick primer on how the evap system works and how to service it: The fuel system is a CLOSED system these days. The final seal is made by the gas cap after fueling. The tank and lines are kept at a specific pressure (could be more or less than atmospheric) while in operation. A sensor on the tank tells the computer what the pressure is, and if it gets out of expected range, a trouble code is set. The evap solenoid meters fuel vapors from the charcoal cannister into the engine's intake manifold to be burned with the fuel/air mixture. It is all controlled by the PCM. Actually quite a simple system overall that eliminates evaporative pollution from the fuel system.
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