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I wouldnt risk it mate. 2mm doesnt sound much but its alot bigger when you put the tubes by eachother. i thought the same but its quite a hefty size bigger. You could try it seeing as there is only air being taken in through the crankcase and not and liquids so there wont be as much pressure.

Im finding it impossible to find red fuel hoses at 6mm!! i found one opn apmotorsport.com but its 19.97 exc. vat per meter!!!!