Some of the more common sizes that come in different wall thicknesses and I usually keep around are.
Tygon
3/32 ID - 5/32 OD
3/32 ID- 3/16 OD
1/16 ID- 1/8 OD
1/8 ID- 3/16 OD
1/8 ID - 1/4 OD
1/4 ID - 5/16 OD
1/4 ID- 3/8 OD
Black rubber type fuel line
1/8 ID - 3/16 OD and 1/8 ID - 1/4 OD
1/4 ID - 3/8 OD
If it takes something in between sizes then the smaller diameter can usually be streatched to fit over a slightly bigger diameter fitting.
Pioneerguy600
Good info here.
Where do you buy bulk line? I see all kinds of no-name stuff online, which makes me nervous.
Scott