If you mean regular rubber, it is definitely not suitable for fuel. But what you might call "rubber fuel hose", these flexible black "rubber-like" hoses, are actually made of Nitrile, a fuel resistant kind of rubber. Nitrile does not get damaged in time by fuel : that is its purpose. It is use in all aviation-type stainless steel braided hose for fuel and oil, commonly used on racing cars (Goodridge, Aeroquip, Speedflow, and so on). This is suitable for injection (needs to be braided because of the pressure). There is of course a non braided version for low pressure (carb), and I don't see why it could not be used on the roadster except if SVA does not accept it.
The only down side of Nitrile hoses is that it is porous to smells, and if the hose is crossing the cockpit, you might have fuel smell. More of a problem in a closed car than in the Roadster. To avoid that, and to stay in the flexible hose type, you need Teflon hose (but the price is even higher)
Hope these details help.
Bye.
Sylvain
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