Per the last three posts, make sure the large O-ring is in the second groove from the top; not all the way to the top. Unless the filter housing has a hairline crack, it shouldn't need to be replaced. I'm betting its an O-ring or over tightening issue.

Here's a pic from a prior post that shows the O-ring placement.

https://www.crossfireforum.org/galle...il_gaskets.jpg