I have used regular Vacuum Hose and that will last 1-2 weeks before it gets eaten up.
I have also used one section1/8 inch Silicon Vacuum Hose and it lasted a Year until I needed to remove it. It had turned Rock Hard.

Injector return hose plastic tube
The brand I used is Oregon, it is a Tygon fuel hose.
Tygothane (Saint Gobain is the Manufacturer)
U.S. Plastics is the retailer.
I have seen the Oregon (chainsaw) Tygon Fuel Hose sold at Oreilly's Autoparts where the Lawn Mower Filters and stuff are. The guy I got the info from never said the size.

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84 300D, 82 Volvo 244Gl Diesel