Bullet skimmer keeps airlocking????

[beginnersluckpg]

Hello all I hope u can help me on this one. I have a precision marine bullet 2 skimmer that keeps airlocking on me I assume and overflows. The collection
Cup I have which is supposed to guard against this apparently didn't and sprung a leak as well and tonight I received a call from wife saying it was leaking all over the floor. After calming her down and getting her to shut it off, I have received the ultimatum fix it or get rid of it. This skimmer works great when it works right and I don't really have the funds to replace it at the moment..... please help, suggestions, ideas I'm ready to try anything......Thanks guys