Use FPM/ECO, impervious to almost everything.
Cohline manufacture it.
We are having the same problems with Petrol and Diesel in the UK.
They have increased the amount of RME in Diesel and they have increased the amount of Ethylene in Petrol.
Ethylene and RME attack attack fuel hoses regardless if it is made to a defunkt DIN standard or not.
FPM [or FKM as other manufacturers call it] is fairly much bombproof.
Copy and paste from my webshop.
7.3mm Fuel Hose.
Suitable for BioDiesel
Sold by the metre.
Specification:
Application
Petrol
Methanol 0-100%
Ethanol 0-100%
Butanol 0-100%
Diesel
Rapeseed Methy Ester 0-100%
Hydro Tested Veg Oil 0-100%
Fatty Acid Methyl Ester 0-100%
Soya Methy Ester 0-100%
Pressure
Working Pressure max 10bar
Test Pressure 20bar
Burst Pressure >50bar
Temperature Range
Working Temperature - 40°C - 125°C
Short term up to 150°C
Additional Standards
VW TL 524 24
SAE J30R9
GME 08 007
DBL 6256.70
BMW GS 93010