Don't trade it yet. I did more research for you. Here is a diagram of the entire system.
Here is a picture of the venting system:
Okay, here we go... I hope you have some time because there is a lot to say. First, the on-board refueling vapor recovery (ORVR) is designed to prevent vapors (HC) from escaping during refueling. The system consist or a (fill vent valve), fuel shut off valve, fuel cut valve (in case of roll over), two way valve... the list contunues. Thank god I don't have to work on them everyday. When refueling, the flow draws air into the filler tube to prevent fumes from entering the air. The fuel vapor in the tank is then forced to flow into the canister fill vent valve and the fuel liquid / vapor seperator. The seperator is designed to only allow pure vapor to enter the carbon vapor canister. When you start the engine, the fumes from there are sent to the intake where they are burned.
Now, take a look at the schematics that I sent. You will see where everything I mentioned is located. My concern falls into two places, canister fill vent valve and the fuel liquid / vapor seperator. One of them has to be plugged or bad and not allowing the vapors to exit the tank to the canister. Thus, no fuel can enter. Locate the valves I mentioned and disconnect one at a time to see if it will take fuel. Whichever one allows fuel to enter, should be replaced.
Take a look and let me know what you find. Sorry I had to be so wordy, but this is a crazy system. Not typical in any way other than there are vents.
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Sunday, October 24th, 2010 AT 10:50 PM