Hey everyone I made a homemade milk pump based off a YouTube video. It's made from a automotive brake line vacuum pump, some small plastic tubes, a syringe to put on the teat and a mason jar. Well I'm getting pressure when I put on my mini Lamancha doe fawns teat and no milk. The pressure gets up to 12 psi which is max. It has pressure gauge. She is in milk. Any ideas what I'm doing wrong?