I'm using the Tygon fuel line for the return lines. I picked some up when I had a sudden failure of an old braided return line. The bicycle ride to the lawnmower shop was much shorter than to the dealer! I was going to just use it for a "get me by" sort of deal but it worked so well I swapped all of the return line for it. I'm running B99.
I kind of like them being transparent, too, not unlike the original plastic fuel lines from the secondary filter housing. I can see the fuel moving as I pump the primer.
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