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Yes. Carb side up. That's a vented gas cap......if it's the metal threaded vent one, close it before transporting.My Stingray has never leaked in 10 years. I do the above.
It's made of plastic, no threaded vent.
They're all plastic. Earler ones had a center steel threaded vent; Viper models and Stingrays. Did not know the year of yours....my caps look like this....direct from Ardisam. Threaded vent.
Carb/plug up.. It shouldnt leak out of the cap, my m43 doesnt. From what I have seen the stingray is really sensitive to how you set it down, my buddy had one and had the same issue, he never did figure out the best way to set it down... would take 8-10 pulls to start it even if he just set it on the ice and then picked it back up a half hour later. My mako 43 is one pull no matter what, with any gas and any oil I use. He moved on to a drill because he was sick of pulling on the 33.
I had laid it cap side sitting down, not sure why I did that, didn't leak the other way around.
I have always set my m43 down with the cap facing the ground, it should only be a 1 way "valve" (air in, no gas out) Never had a leak that I can remember. I store it upright in the garage with the cap cracked, otherwise it sounds like a semi letting out the breaks with all the air coming out of the tank when I open the cap after a few temperature changes. My cap looks the same as yours, bought probably 5-6 years ago.