There is only one PCV hose.... so what is it that you're thinking is the "back" line? Pic?
PCV= positive crankcase ventilation (emissions controls on cars since the 60's that sucks up crankcase emissions to be burned up in the engine)
PVC= poly vinyl chloride (plastic, good stuff unless it burns, then it emits poisonous chlorine gas in mass quantities)
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Originally Posted by the user formerly known as ZX3_Chick
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