Federal Pump "Pukes "Fluid

You have too much fluid in the system. The gearbox pumps back against the pump when it's turned unenergized. If there's too much in the reservoir, it will push fluid out of the can. You don't fill it all the way to the top. I'd say a good 2-2.5" down from the top is considered full. Does the cap have a dipstick? It should read full when running and warmed up. I always ran mine a tad low, that way what you experienced never happens and you still have plenty of fluid.