I used one with this nozzle type from Harbor Freight yesterday to put fuel into my car, with the intention of putting fresh fuel back into the container. It's time to refresh my generator supply.
The spout did reach into the gas filler hole of my car, but I had to depress a locking tab, with my thumb, and then depress the button to open the valve. It was challenging to do with just my thumb, and in particular because I couldn't get good purchase on the button because it was up against the fender. The cap or nozzle also leaked although I had it pretty tight, and I had to hold the bottom of the can, to hold it up. SO my left hand got covered in gas as it dripped to the ground. Certainly I needed to make sure it didn't drip onto my shoes or pants.
I suspect that depressing the release catch and then the button would be even more challenging if the plastic was cold, like in the winter. UGH!
I have I think four of them with THIS style release system.
There is a thumb release lever, and then a squeeze green button to open the valve. The spring for the green button is pretty stiff, and my hand gets tired holding it in, while waiting for the container to empty.
The nozzle works for putting fuel into a generator or lawn mower, but is too short to reach the inlet of the gas tank in my car, so I had to use a funnel. That chore would have been easier if I had another person to hold the funnel.
EDIT: Now that I think about it, the nozzle wasn't too short to reach the inlet. It could reach if the container was full. But with it held straight on, it couldn't tip high enough to fully drain all of the gas into the car, maybe 60%. I could turn the nozzle 90 degrees and empty more of it, but still not all the way. It was a challenge and awkward. I didn't use a funnel, but if I wanted to fully empty it, I could have used a funnel. That likely would have taken two people.
End EDIT:
Also when trying to refill the container, there is a strainer inserted in there that blocks the gas station nozzle such that one needs to fill it very slowly, or it will cause the automatic shut off to click off. The attendant told me that a lot of people break through the bottom of that strainer. I think that it is a safety device designed to keep the gas from jumping out if it is filled too quickly.
I have a small one or two gallon container that has a spout similar to this:
It has a collar with slots in it that you rotate so that the slot lines up with the nozzle. When inserted into the neck of the fuel tank, and depressed into the neck the little lip catches on the edge of the neck and depresses the nozzle releasing the gas.
This is the easiest of the ones that I have.
@turbodog I had seen the one that you presented but am concerned that the attached funnel will collect dust and debris and then dump that into the gas tank clogging the carb. So I decided against it. What's your experience?