Anywhere you'd store that fuel would be above the tank the engine draws from, and gravity can do all the transfer work after a couple squeezes on something like this:

https://www.amazon.com/OKOOLCAMP-Siphon-Pump-Gasoline-Durable/dp/B091YPJXX3/

... which stores in less space more flexibly, and is a fraction of the price. Plus the containers your linked product is meant for should be refueled on the ground for safety reasons, meaning you'd still need to lift the fuel.

It's a neat product, but it's gimmicky for the benefit it'll bring.