After much searching around I haven’t been able to find a thread about this and it’s been driving me nuts.

A couple months ago I replaced the engine in my 95 Runner with a rebuilt, and ever since I cannot for the life of me get the clutch pedal to build and keep pressure. I was able to shift it into first and drive it around for a bit but here’s my issue:

I can pump the pedal like an ape for a minute or so and it builds up pressure and snaps back like it should. But if I let it sit for a second the pressure goes away. And I can hear an audible hiss like fluid is getting back through a seal? I’ve bled about 2 tall cans of dot 3 through this thing until no bubbles appear but that didn’t fix it.

I’m just getting into working on cars and the engine was my first big project so I’m struggling to figure out what this could be. Thanks in advance.