what line for injector return?
 

From ********, is this the correct one?
Thanks

6050780581

Cohline
Fuel Hose/Line; Braided Hose 3.2mm ID x 1.9mm Wall; Bulk
As required, injector return lines and miscellaneous uses, please note size of existing hose should be 3.5mm inner diameter X 2mm wall thickness. Primarily used for vacuum line and fuel return lines. Sold by the meter.

Looks like the right stuff, and is 3.2mm as far as I can tell, so it should work. There is some debate as to what will last the longest, especially if you're using biodiesel. SEE:
http://www.peachparts.com/shopforum/showthread.php?t=228943&highlight=injector+return+line

One member claims that 3/16" Weed Wacker fuel hose will also work. He bought it from a Gardner supply store.
Various place including Ebay sell Viton fuel return hose.
I would like to know if the Viton will last longer when using regular Diesel Fuel and if it can hold up better being pulled on and off multiple times better than the stock hose.
When you find a cheap source of the stock return hose buy extra as it cost a lot of bought locally.

the local ACE has fuel line for small engines. cost less than a buck a foot, last longer, you can see fuel/bubbles, etc....