Ok i found this on U tube:
and i have been doing this from when i was driving 2013 Ecoboost PI
https://www.youtube.com/watch?v=pQBjQAq3La8Purchase the 1/4" Check Valve and a 1/4" Female Cap, (about 20.00)
If you want to make it even easier, Replace the PTU Vent Hose with a Larger and 1 Foot Longer Length (about 48", 4.00)and add a Breather Filter instead of the Stock PTU Breather.
"you can also Fill thru this hose if you want, A bit more time and Mess"Pull the Drain Plug,
Install the Check Valve,
Fill (with a Simple Pump 10.00)
with 18 OZ of your Favorite Go Juice
and after filling install the 1/4" cap,
NOW takes about 20 Min Max to refill