The Stovebolt Site Forums The Parking Lot Big Bolts The Stovebolt Volunteer Fire Department Help identifying. Primer pump? -- 67 7500

Hello everyone I'm going to post this here and in the fire truck forum. My 67 7500 was a fire truck originally most things were removed except all this under the hood. Was told it resembles a priming pump. It was plumbed into the back of intake next to hydrovac line. The long gray tube over the fender well is brass along with the red filter canister. I would love to know what it all is. I hate to scrap it if someone could use it. Thanks in advance!