Only one seized bolt hold seal plate

3 other bolts are missing from the seal plate on my pump, my motor stopped working last night and I have a replacement sitting here ready to go but cant get the seal plate off
1 bolt is all holding it on
 
All that has been taken care of, another question that I now have and it might be a no brainer but I have no brain. So when I am full skimmer, which is how I think I will need to run my pool vac the pump doesn't stay primed as if it were on skimmer and bottom drain mode, is this normal, or something amiss???
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.