My 81 Wagoneer Limited has been sitting off/on for the last 4 years. I rarely drive it because it is always a royal PITA to start after it sits for more than 7-10 days. So I saved up and bought the fi-tech efi with force fuel kit for it a few weeks back. First off, it runs like a dream. I've never heard it idle so well and it starts on the first crank every time. Now on to my problem, I'm suddenly overheating like crazy. I decided to put it in 4-wheel drive and take it for a spin in the snow and just break it in a little after sitting for so long. And I came home about 10 minutes later to steam coming out of the water pump. Radiator and fan were replaced about 500 miles ago so I'm pretty sure that's not the culprit. Water temp was 225 degrees by the fi-tech control panel reading when I shut it down in the driveway. Is the water pump my most likely candidate and is this something I can do on my own? I had someone come install the fi-tech for me, so my funds are pretty low at this point. I wasn't comfortable dealing with the fuel lines, but I feel like I can handle the water pump. Any pit falls to look out for if I take this on?
Here's the link to my overheating.
https://photos.app.goo.gl/oXTzdG6aGMBf44Z17
Any help would be greatly appreciated.