Time for a new topic.
Ref :     Fuel hose

SAE   rate fuel hose with some number such as
               30R6,  30R7, or 30R9
I'm have not found a good definition of these or for
that mater, I have not found a minimum rating
for our Vanagons, fuel hose or cooling system.
Can anyone shed some light on these spec.'s?
                               thanks
                               JOE .W