Originally Posted by dieselguy
Big Bill ... the vent line is 1/2" as is the fill line. The problem lotsa times is the vent line is kinked over itself during installation ... mine was and secured with a wire tie to boot. A mobile repair guy in my area brought this up in conversation.
OP : I took this picture at the factory, this was a Silverback. Fill tube on left, overflow tube on right.
dieselguy: Not sure if the "loop" in the vent line stays in that position or not, but if it gets kinked that would be a problem as you noted.
2012 Dodge 3500, SLT Big Horn,CC,DRW,Cummins HO, EB, 4x4, 3:73, Retrax Pro, Q20, TST507, Garmin RV760, Sleek 4g
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Retired Army in 1995, and now retired in 2016