Just wondering if anyone can tell me what the capped off nipple on the top of our Vapor separator tank is, and what it's used for. Looks like it might be a quick connect for some sort of guage maybe? Can't find anything in the owners manual or the teardown manual. The rubber cap is called "plug" on the parts list. I thaught maybe for bleeding out air, but I didn't see any mention about having to bleed the fuel system. Screenshot_20220910_041842.jpgScreenshot_20220910_042014.jpgScreenshot_20220910_041742.jpg