I need to hook a temporary tank up to my carbs (for a carb sync). I've got a temporary tank with single 1/4" ID rubber tube (barb on the tank measures 0.340" OD). Of course, the motorcycle is metric, so has 7 mm ID fuel lines, and being a 4 cylinder has 2 rails to feed.
7mm is a bit bigger, but fittings that work well on 1/4" presumably would be "good enough" (when used with clamps) for this particular short term/controlled environment usage. I'd feel fine about plugging the 7 mm ID hoses onto the tank's 0.340" OD barb if I didn't need the tee.
I've been trying to locate an appropriate 1/4" tee connector. Local hardware/tractor/building supply stores only seem to carry larger stuff. Pulling up brass tees on Grainger's site shows 1/4" tube size tees as having only 11/64" barbs, which would be way too small indeed if it's OD. If I step up to 1/4" barb size though, the tube size balloons to 3/8" which makes no sense to me. I'm very confused, none of this seems to match up to what I've got here. Exactly what tee size should I be using to plug multiple 1/4" and 7mm ID rubber hoses together?