So there are 2 seperate vacuum systems? One for the door locks, rear head restraints, fuel door and seat backs and also to the tranny? run off the vacuum pump under the rear seat. And then there is engine vacuum which is a totally seperate system? I see one line to the breather hose from the fuel pressure regulator. There is vacuum in the brake booster servo line. Can anyone direct me to a "Vacuum for Dummies" to read?