And a tip of the hat to ACP for once again reproducing a badly needed part for Ford fans. Although this valve was used from 71-73 (through 75 on the Maverick) on all Ford corporate car lines except station wagons and Rancheros, the Mustang application doesn't hurt. I've seen used ones (when you could find them) that looked like they were dug out of a mud pit sell for double ACP's $55.00 price. Many of us have discovered when pulling the fuel tank on these 50+-year-old cars that very little if any of the foam material was left in the valve.
Ford used an open cell foam material to permit fuel vapors to pass through the vapor separator valve to the charcoal canister. It also kept liquid fuel and debris from entering the orifice and possibly stopping the vapor line up, allowing the fuel system not to vent properly. As you can see, the orifice is very small and could easily get stopped up with the smallest amount of debris. With how our fuel system is vented, it is vital to keep the orifice clear and open to the charcoal canister.
I have used stainless steel pot scrubbers such as Scotch-Brite, Chore Boy, etc. They use a ribbon-type material that would be less apt to stop up the filter on your sender unit than some other materials if some were to drop down into the tank.
