The evaporative emissions system is actually very useful
and worthwhile to keep in working condition. First and
very important, your 911 doesn’t constantly smell of
gasoline. If you are missing the charcoal canister, it
is common to many German cars of the era. Just tape
over the VW logo.
Here is the diagram for ’69-‘73: “
"
© Dr. Ing. h.c. F. Porsche A.G.
1) Expansion chamber [the black box under the cowl
on the driver’s side]
2) Vent chamber [behind the LF headlight]
3) Activated charcoal container
4) Engine fan shroud
5) Pressure line from fan to activated charcoal container
6) Purging line from charcoal container to engine air cleaner
Note the 13 connections around #1 and the fuel tank. This
clear (now brown) hose typically shrinks and comes off the
fittings causing gas fumes in the trunk and cockpit
Here are the locations in the 911.
“
"
© Dr. Ing. h.c. F. Porsche A.G.