Need help with my hose

Do you have an overflow container? The hose to/into that container or the reverse flow (vacuum) valve under the cap (the smaller silver or brass button on the bottom side of the cap) could be blocked/stuck.

The coolant will normally expand when hot and contract when cool. It sounds like it got a bit hot and pushed out and then the remaining coolant cooled after running and did not draw anything back in; the reverse flow (vaccum) valve should have allowed that. It may have pushed out air as the system was being purged of air after the pump change. I would recheck the coolant level and make sure it is topped up after this, and that any reservoir coolant was at the normal level.

Perhaps your cap does not have that valve? See here:
http://www.centuryperformance.com/cooling-system-basics.html

Can you post a pix of the underside of your cap and give a brand/model number?

Was the 200* temp very unusual, or were you just running it harder than normal? Again, if there was air stil in the system, that migth be the reason. It often takes quite a few heating/cooling cycles to get all of the air out of a system.

(If the elevated temp is abnormal and you were not running it hard, I would be checking to see if I had a compression leak into the coolant. But this does not seem likely since it pulled a vaccum and so much of it.)