Totally agree with JimmyJ. Thats how it works for me.
I sure would appreciate anyone with some knowledge of how these work helping in figuring out why they leak so badly out of the box, and posting back. Mine leaked even using the condom. When I pulled off the condom, it just started pouring out.
Honestly it sounds like you have a break in the seal around the black bung the caps it off. it creates a vacuum in the res. and prevets leaking, try shoving the bung in there tighter or checking the bottom seal around the coil for breaks, had one of min come slightly pulled out of tube and just shoved it back all the way in and fixed leak.