Fuel lines - what size?

[Scarlet-Jester]

I have a 1997 25hp 2 stroke yammi.

How do you know what fuel line size it is? I cannot find these details anywhere? I see there is 3/8 and 5/16.

Which one do I use?

Thanks.

[9D280]

You could get away with a 1/4" on that - I ran a Suz 25 on that size with no problems.

3/8" is probably a more common size if you are building the fuel line from scratch & buying components.