My shower sump pump was blowing out the sides of the pump nothing was going out the sea cock.
As Bacchus already said, shower sumps discharge through ABOVE waterline thru-hulls, which don't have seacocks and therefore don't need a vented loop. If the hose from the sump pump goes to a below-waterline thru-hull, it's a pretty safe bet that it's been incorrectly installed. It's wild guess, but I wouldn't be surprised if whoever installed it connected it to an unused toilet discharge thru-hull.
You should be able to find the correct thru-hull if you carefully check for open thru-hulls low--but well above waterline--on the outside of the boat on near the head.
But to answer your question, a blocked vent on a vented loop wouldn't cause your problem even if it were installed correctly.
As one who restored a "project boat," it's fun ride during which you're met an amazing number of surprises that'll leave you wondering WHAT were they THINKING????" This sounds like one of 'em.
--Peggie
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