Just the 1/8th inch line will be just fine, been there, done that on many OS160's. On large glow engines you should be using 1/8th inch line anyway. My theory is small 26cc gas engines use 1/8th inch lines and they use half the fuel amount that a glow in that size will use, so why not. It's not much more than the standard size and way less complicated than trying to get the perry pumps setup right.