Where to buy fuel return hose VW RAbbit
Diesel Injector return lines, where to buy? - PeachParts Mercedes ShopForum
The Thread with the part numbers
fuel return line replacement part - PeachParts Mercedes ShopForum
Viton Injector return Hose part numbers
VITON Return line number - PeachParts Mercedes ShopForum
Some People have used Weed Wacker Fuel hose
Tygon
This is a 3' Length of 1/8" Tygon Fuel Tubing from Dubro.
FEATURES: Yellow fuel tubing. For gasoline or diesel fuel only. Won't harden or crack, and remains flexible. 1/8" i.d. fuel tubing.
INCLUDES: One 3' Length of 1/8" Tygon Fuel Tubing
SPECS:Inside Diameter: 1/8"
NAPA sells the real Fuel Return Hose and some people have been using some sort of 1/8" Fuel Injection Hose they sell.
Vacuum Hose fits but will only last a week or so.
Every once and awhile someone has an Injector that leaks at the Base of the little Nipples where they are crimped over. If that happens get report that in this thread.
If the Injectors are leaking between the Nut and the Upper Body you can try re-tightening them. If that does not work the Injector needs to be pulled out of the Engine and taken apart in the inside precision surfaces lapped flat again.
The exception to the above is if the Injector Nut had developed a Hairline Crack. That would call for the Injector Nut to be replaced.