Ok, so I tried this out last night. I went to my gas door and plugged it in to the yellow line with a red line on it. when I pumped the MityVac, I got absolutely nothing. No reading on the gauge, nothing.

So can I assume that either there is a leak in the line somewhere, or that the vacuum pod is not working?

Keep in mind the car had been off for a little bit, and I did not turn it on when I tried it.

Thanks!