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Diesel fuel system under pressure when shut down?


Model: CayenneD, Year:2013, Mileage:15,000, Type of use:Street use only
Re the question on draining water and changing the fuel filter on a Cayenne Diesel. Will the fuel system retain pressure that must be bled down before attempting to change the filter or remove water? Will it be necessary to purge air from the fuel system before starting? Thanks!

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