Hi Lotty
I cant remember off the top of my head what size the fuel hose is on the 90 tank - id nip out and look but im in Canada and the 90 is in the UK
....though id try and use the same stuff as on your rear tank - so they both go onto fittings (change over taps etc) and you dont have to worry about carrying/finding different sizes -interchangability is always a good idea in the boonies.......
run some cord where you will mount the fuel hose under the vehicle and measure it, then add a bit for mistakes.
also make sure you run the hose in the coolest areas in the engine bay to avoid vapour locks.
cheers
Grif
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