Thread: Why do I have vacuum in my diesel tank.....................?
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Old 03-26-2008, 09:40 PM
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Hatterasguy Hatterasguy is offline
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Join Date: Nov 2002
Location: Milford, CT
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Its a closed system, a little bit of vacuum or pressure is normal.

Thats why when you change the fuel filters after the car has been sitting in the sun for a bit...you crack the fuel tank cap...so you don't take a bath in diesel.
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