Hi, no, I mean the pump itelf. Sometimes; when I start the engine, I have no vacuum at all (I've checked with a syringe on a little connector) and at least 5 minutes after running, all works well. I deduct that a valve must be sticking !!
Here in France kits don't seem to be available; I've got the pump out and I have found on the top of pump itself, a screw-on connector to the fat pipe ,something looking like a valve... well..I thought that I chould replace all the valves including that one. "speak" to you soon I hope