From what I can tell, my Yanmar 3Ym20 takes 5/16 fuel lines (probably the closest standard size to the metric size it was actually designed for). I'm having a hard time getting from the 3/4-16" UNF ports on the Racor to the 5/16 fuel line needed. Does anyone have a good resource to source parts and get some advise? Local stores are extremely low on fittings and 100% out of 5/16" A1 fuel hose.