Guys, I’ve got a 1948 3100. I’m chasing a vacuum leak on a 327 with TBI/throttle body injection. I’m still using the vacuum wiper motor as it still works well enough for the few times I’ve ever been in the rain. My question tho, is: when the wipers are not being used should the vacuum motor leak any vacuum? I’ve hooked up my hand vacuum pump to the motor (still under the dash) and with the motor switch in the “OFF” position my hand vacuum pump will not build up any vacuum. Does anyone have your vacuum wiper motor on the bench and could you hook up a vacuum pump to it? What kind of seal is on that switch port at the motor and should it hold vacuum? A picture would be cool. Thanks in advance. Dave
