fuel lines aren hard to gain access to. original type clear lines get hard quickly and will leak. echo has pakages with a aprox. 4" piece of black line for gas with 10% or less alcohol. These are around $5.00 at Home Depot. Where can these black lines be found in bulk with an inexpensive price. Also, if you use a coffee filter each time you transfer the fuel until you add the fuel to the tank you can go a lot farther between intervals of cleaning out your carburators.