Optimax fuel line size

[gordiegarland]

Wondering what is the proper fuel line and bulb size diameter to feed a 2011 mercury optimax 90hp 3cyl?

 

[alldodge]

If no one with more expert experience does not come in, I will offer, look at the fuel pump inlet fitting size. The inlet dictates the size line needed

 

[ajgraz]

I don't know what you mean exactly by "bulb size diameter," but I'm using 5/16" fuel line to feed my 2014 Opti 125 (same 3cyl block)