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Okay, if you were on the muffs that should at least have kept the pump safe. Did you get any water out the exhaust? I would expect to see water at 30 seconds but remember you have to fill the whole engine cavity before it comes out the top. I would leave it on the muffs, and make sure they are sealed well, run it for a little longer, but don't bring it above idle until you at least have water from the exhaust.
Don't rev up the engine until you have water from the exhaust, don't want to overheat the exhaust passages. But if water is flowing from the exhaust you can rev it up a little so pressure will come up and then it should start to pee.
Hello, my name is ***** ***** different expert here on the site. Do you still require assistance with the engine?