Did you order a different size inner diameter for the fuel pump to carb lines? That 1/4x1/8 will be too small for those lines. Might work for the line that sends oil from the fuel pump to the barb on the bottom of the motor (that lubes the bearings), but I think the rest are larger. Can't remember the size of the vacuum pulse line but that's usually ok as I think its nitrile. For the 3 carb lines, I use that 3/16 I posted about earlier. There's another size, larger, for the tank to fuel pump. If you need that size, I can go check my machine for what it is. Off the top of my head I can't think of what it is (1/4 or 5/16) I added a fuel shutoff on that line for piece of mine. I had a fuel pump fail a couple of years ago and the motor filled with gasoline.