Help ID this part!

I got one off an 1981 bronco with a 351

It was removed when the truck was new and stayed in the barn for years. Took it to swap meet and it is in a pile outside the barn now

Emissions pump was common to block off and remove them. Doubt it helped anything

The bronco that my pump came off of go 8 mpg, my 85 bronco got 8-11 mpg, had 79 short bed got 9 mpg on gas 6 mpg on propane

Leave it on remove it and block it off, not a problem unless you have emissions testing in your area