24
EL
ECTRONIC
F
UEL
INJECTION
-
AFC
The Porsc
he
912 E
is
equipped
with
a
motor
that
has
a air
flow
controlled electronic fuel injection .
Before we describe this
unit
in detail, a few words about the accelerator cable.
The
accel
era
tor
cable
is
in
two
parts. The connector (arrow)
is
located
within
the engine compart-
ment behind the rear panel
and
is
accessible when the cover
to
the guide channel
is
removed.
Construction
and
funct
ion of the
ATC
injection
The component parts
1 Fuel Tank
2 Fuel Pump
3 Fuel Filter
4 Cold Start Valve
6 5 Fuel Injector
6
Pressure
Regulator
7
Auxiliary
Air
Regulator
8
Throttle
Switch
9
Air
Filter
10
Temperature
Sensor
II
11
Battery
12
Ignition Switch
A Int
ak
e-air
Sensor
B
Throttle
valve
C
Air
Sensor
Flap
o
Co
ntrol Unit
Principles
of
Operation
The amount
of
fuel
that
is
to
be
used
is
determined
by
the vo lume
of
intake air
and
the
speed
of
the
motor.
The injector sequence
is
determi
ne
d
by
th
e igni
tion
dis
tr
ibu
tor
breaker points.
The fuel required
for
cold starting
is
injected by the electro-magnetic cold start valve.
Warm-up
en
richment
of
t
he
fuel
mixture
is
via t he
au
xiliary air regulator in conjunction
with
the
temperature s
ens
or I in the in take-air
Se
n
so
r housing and t
he
temperature sensor II in the cylinder
head.
Fuel mixture enrichme
nt
for
full
load condi tio
ns
is
by
me
a
ns
of
a
throttle
switch.
6
2
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