Fuel Evaporation Control - Porsche 928 1980 Owner's Manual

Fuel Evaporation Control

Activated Charcoal Filter
Vapors from the fuel tank are trapped in a
container filled with activated charcoal. The
filter is connected to the fuel tank vent sys-
tem. This is how it works:
Fuel vapors pass through the filter and de-
posit hydrocarbons on the surface of the
1 Fuel tank
2 Fuel line
Fuel pump
3
4 Fuel pressure damper
5 Fuel filter
Fuel pressure regulator
6
7 Fuel injection lines
8 Air distributor/Intake manifolds
Fuel return line
9
10 Control valve
11 Expansion chamber
12 Tank vent line
Safety valve
13
14 Carbon canister
15 Air cleaner
16 Engine compartment
17 Throttle plate
18 Injection valve
Filler cap
19
20 Vacuum control line
charcoal filter element. When the engine is
running, fresh air is drawn in through the
charcoal filter. This fresh air regenerates the
filter and routes the hydrocarbons through
the air inlet housing back to the engine,
where they are burned during normal com-
bustion.
Fuel Tank Venting
An expansion chamber for the fuel tank and
vent lines are part of the fuel tank vent sys-
tem. These components prevent fuel from
escaping to the outside at extreme high out-
side temperatures and when the car is driven
or parked at an incline or in any other non-
level position.