deferr,

U can purge, replace and clean all U want but if U don't use a fungacide, the fungus will grow back.

Actually all U need to do is get a fungacide to treat the fungus problem. Biobor is best but very expensive (cost me ~ $80 for a quart, 1/2 was shipping because it is considered hazardous). Try a tractor dealer in your area for a diluted product. Make sure U get a fungacide because only that will work. The diluted fungacide is probably Biobor diluted with a pint of Diesel fuel. U should treat the fuel system twice. And then maybe a "maintenance" treatment once a year.

Its not necessary to replace the fuel lines. This will save U a lot of work! The biocide will clean them but be prepared to replace a few filters. Don't put in new filters until the ones U have in now plug up as the new ones will plug as fast as the used ones. I didn't clean my tank after using the fungacide but I had to replace 4 filters (2 each) in about 2 years. When I stored the car for the winter, I treated the fuel system with Biobor. That way it was working in the fuel all winter.

P E H