E5 will eat traditional rubber fuel lines in about 3 years, had it happen on my classic (twice). The traditional fuel pipe sold has various BS and other specs on it, the most commonly available one is J30R6, its useless with E5. The next spec is J30R7, also usless with E5. The correct spec hose for E5 is J30R9 but try buying it in the UK. Some sellers show it on E-Bay but there is loads of evidence on classic sites its R6 at best with R9 painted on it. Gates and Goodyear (amongst others) show J30R9 hose in their catalogues but its not available in the UK, only in the US and to buy a full reel and pay postage and duty it is not economic unless you club together with several other owners.

After much searching I fitted a very high quality braided stainless fuel hose with a PTFE liner called Moquip TFE (it was developed for fighters in Vietnam) from a company called Think Automotive. Its compatible with all fuels (including Ethanol) but the hose is not cheap, the fittings are extortionate, you need to get some fittings on the car modified and its painful to work with.

With regards to the issues E5 has caused with carburettors on older cars my car has been updated with a modern engine and fuel injection thus should be safe from any of those issues (unless it eats the alloy tank and swirl pot).