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Most likely, the tank has not quit working. The "brain" of the CNG system on your Contour is called a compuvalve. It is mounted under the car, below the engine. This is the likely failure of your vehicle. Fore more info, visit

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โˆ™ 2008-04-17 19:17:54
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Q: Why would the natural gas tank on a 1999 Ford Contour CNG quit working?
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