I performed a preliminary inspection under my '89 westy last weekend, to
evaluate the condition of my lines, and determine what I was going to need.  I
was surprised to find that I have 3 different fuel line sizes!  I checked my
brothers '89 Carat and his was exactly the same.  On the feed line (Passenger
Side):  10mm from the gas tank to the pump - 10mm from pump to filter - 7mm from
pump for about 3 inches, then gets converted down to about 5mm or so.  This 5mm
line then runs to the firewall, where it gets converted back to 7mm before it
connects to the plastic line.  I'm assuming it is alright to go ahead and
replace the 5mm with 7mm instead of doing a similar stepping down in sizes for
the run. I'd never heard this mentioned before, so I was a little surprised.
TIA for any comments.

By the way, the only problem I noticed was a small amount of wetness on the hose
leaving the fuel pump.  My brothers van didn't have any apparent leaks.  phew!!
We're still planning on replacing all the lines.

Cory
'89 westy
Seattle, WA