Hi,
The system was under pressure. It isn't uncommon for this to happen because it starts a siphon and the fuel will continue draining.
I attached the directions below for you and a link showing in general how it's done. Look through them to make sure everything was done correctly. As long as there are no leaks now, you should be okay.
https://www.2carpros.com/articles/how-to-change-a-fuel-filter
Let me know if there is something I can do to help.
Take care,
Joe
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Monday, August 16th, 2021 AT 10:14 PM