Originally posted by tcodi
OH OK,

I've heard people say that's how to test if it is working but I wasn't sure if they were credible sources.
I suspected they weren't.
Thanks
if you dont have a pump sometimes you can push the adv. adv. open with a screw driver or something and put your finger over the end of the vac. line and if its good it will hold it open when you let go of the screw driver.