You can replace it with 1/4" ID Regular Fuel Hose from the Auto Part Chain Stores; that Hose is also rated for Diesel. And, you will need Hose Clamps.

To get the Old Plastic off you need to heat it just enough to soften it and pull it off. That can be done with a Butane Lighter or a Candle.

__________________
84 300D, 82 Volvo 244Gl Diesel