I got a few answers on this one BUUUT:

Even though it has been hot here in SoCal in the last two days, my
gas expansion tanks usually gurgle most when I drive short distances
(like move it from the parking Gestapo for maybe 2 min), it does it
when it's cold, when it's hot, can't really tell if the environment
has any effect on it or if it's just random. The gurgling/gargling is
coming from the expansion tanks in the front wheel wells. I did
replace the hoses that are accessible, as one of them was soaked and
looking wet, a few weeks ago. Still gurgles. This is not the charcoal
system I am talking about since this  is a Soobie conversion with the
Soobie charcoal setup.
Why would my expansion tanks burp and gargle??? I still do suspect a
fuel pressure problem and will try to check that ASAP. Searching the
archives, as usual, did my head in. Perhaps fuel pump or pressure
regulator. Would that make any sense?? I'll keep everybody posted on
the outcome, which may take some time as I am busy.

Cheers

Matthias (1984 Wolfy Soobie 2.2 "Babar")