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Just spoke to seafoam and they no longer recommend using vacuum line. they recommend using their new spray can directly into the carburetor or air intake. The product has not been certified for general aviation engines to expensive for the benefit they would receive.

My 1986 chevy s-10 2.8 liter 6 at 310,000 miles still passes inspection with low hc It usually fails until i break the vacuum line and suck 1/2 can of sea foam into the intake manifold let it set 15 minutes then run it for 10 minutes works every time. i have done this with several friends...