I would strongly recommend that people don't pull there pumps apart and try to re seal them. If its not broke don't fix it.
I have seen a leak under the
pressure switch once before. Out of a few thousand pumps we sold so this is not something that happens often. I would assume its happen before and i was never alert to. If people with the problem see this let me know.
Someone is more likely to harm something taking there pump apart and "fixing it" than just leaving it alone. Getting silcone where it does not belong. Yes, some other company's do reseal the pumps because they buy pumps not intended for alcohol injection and swap out parts to make them compatible. While they are in there they take the time to reseal it. We sell the pumps as they are manufactured for us by shurflo. These pumps are pretty rock solid. I know shurflo sells over a million pumps each year so I would assume
that if there was a problem with the design then it would be addressed.