You need a marine portable fuel tank. They already have a stand pipe since they all pull from the top. This one has a level gauge. There are many others.I did that so I don't have to worry about leaking. I have a standpipe installed inside to pull from bottom.
I also bought one of these jugs. It fits perfectly, has an angled spout for filling easier in-situ but installing a standpipe will be difficult to access the nut on backside and it's opaque so not easy to see fuel level.
https://www.amazon.com/dp/B01BNBCRRS/?tag=wranglerorg-20
Jug link doesn't work for some reason.