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Old 06-19-2011, 07:11 AM
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in the old daze when transmissions had vacuum lines on new cars... you often would notice a u shaped loop that went 'up' near the hook up to the vacuum source at the manifold.

That loop 'up' , then down towards the trans , prevented fuel from traveling down the vacuum line tube. Any fuel would drain out of the vacuum tube because of that loop
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