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Re: 2006 expedition P0455 and no leak
Posted to Technical Theory Forum on 2/27/2018 3 Replies

With the vent valve closed, I use either the venturi portion of my cooling system vacuum filler or a vacuum source from the intake manifold while the engine is idling. ONLY enough to verify that the sensor sees vacuum- imploding the gas tank would not be good.... Login to read more.

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