I rebuilt mine and while I don’t have it installed back I the car yet, that will be this weekend 🤞🏼, but after talking to “Hal” at the Preservative Society who was most helpful and beyond a pleasure to talk with, he guided me to some do’s and don’ts on what to look out for with these SW Vacuum Fuel Pumps!!   Hal instructed me to  take the inner tank and while holding the flap shut momentarily on the bottom of the inner tank submerge it into a bucket of water or a deep Rubbermaid contai