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.

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84 300D, 82 Volvo 244Gl Diesel