On the outlet tube of a 76-kombi fuel tank the diameter is to suit 5mm hose. Did they change this in later model buses?

i.e. to take 6mm hose.

[Edited on 1-6-2003 by DakDat]

Not sure, my '77 still takes 5mm hose.
I do know some fuel pumps have a large inlet ~8mm I think.