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Fuel evaporation leak check questions
I am hoping someone can answer some questions I have about the automatic fuel evaporation leak check. This appears to be a problem for many owners with relatively little concrete information available.
I had a CEL a few weeks ago for a small leak detected in the fuel evaporation recycling system. I reset that and changed the fuel filler cap. Now several hundred miles later and a full tank of gas later, the Durametric software shows failed for the leak check and pass for everything else. However there are no pending or active codes showing for a vacuum leak.
1) is it likely that the evaporator vacuum leak test has run since the CEL was canceled and failed, or that it has not run?
2) if it has failed, how many fails before the car shows a fault code?
3) does anyone know of a way of forcing the leak check to run? It appears that the fuel level must be between 3/4 and 1/4 full, but that is all I have established for searching. I cannot find anything in the software, although it appears you can cycle some of the valves.
4) does anyone have a good diagnostic procedure for ruling out the usual suspects, filler cap, filler valve and carbon container valve? Is there any easy place to T in a vacuum pump and check for piping leaks?
Advice much appreciated.
Philip
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