The problem with 4 stroke carburetor motors is they are extremely fussy in regards ***** ***** clean the fuel is because the internal passageways are so rediculilously small that they will clog at the slightest hint of trash, and they will also clog on water. What my recommendation would be is to get yourself a fuel caddy type dispenser that comes with a pump. And then mount to that caddy a fuel water separating filter. The filters on the engine are about as good as filtering fuel through panty hose, and they don't catch any water. What I would do is get something like this, in this link;
Then mount to that this type of filter - https://www.amazon.com/Sierra-International-18-7983-1-Marine-Separator/dp/B001HBX3AK/ref=sr_1_2?s=automotive&ie=UTF8&qid=1471897472&sr=1-2&keywords=fuel+water+separator+kit
Use that to fill the outboards. Or, use that to fill small 2 or 3 gallon gas cans. Make sure the gas cans are clean as well. Lastly, on the motors, check and make sure the tanks on those are clean. Also check to make sure the fuel lines are not deteriorating on the insides. You can do this 2 ways. The first way is to fold the line in half, if you can see it cracking on the outside, then it will be cracking on the inside as well. Also, stick a blowgun in the end of the fuel lines and a clean white paper towel at the other end. Blast compressed air through the lines, and make sure no black bits end up in the paper towel at the other end.
If you had big inboard engines, like V8's then you wouldn't have to deal with this. But on the 4 strokes the carbs are just so small that they clog up if you look at them the wrong way. Filtration is the key to keep this from happening over and over.
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