Yes, I got some crap Shell gas, it was so bad my tractor wouldn't even run on it (I filled up the Mark and the spare gas can at the same time) there was soo much water in it they closed the station till a state inspector could check into it. The state found a huge leak at the top where water would get into the main tank - and it had rained hard that week. Still trying to get them to pay for the repairs on the tractor and the Mark - ha! Glad iu can do this stuff mny selfm byt I was out $55 for the bad gas, $9.00 for a siphon kit and $50 in fuel filters.
Trick an old farm hand taught me- if you mix equal amounts of gas and antifreeze and then shake it up good -if you end up with more antifreeze than gas then the gas contained water.