Here are 280i filler neck hose sizes..

[mrzigazaga]

Hi peeps, After hours of deliberation i finally went out to take out the filler neck.. Wow.. took about 2mins.. and i done it with one hand..Right the joiner that joins the neck to the tank is 50mm or 2"(marine), Have found someone up north and will post site once ive got some and tested it, The breather to the tank from neck is 15mm or 1/2" (thats what was written on pipe)I purchased some 5/8" and it fits nice,, Finally the breather to atmosphere is 8mm. Becarefull if ordering samco as there are some that size and although advertised are not fuel resistant, I hope this helps as i struggled to find out.. Maybe its me aftershave..