1998 BMW 328i Fuel lines

160-
4



FUEL
TANK
AND
FUEL
PUMP

Fig
.
4
.



Pinch
off
supply
and
retum
fuel
hoses
(arrows)
before
dis-
connecting
from
rigid
metal
lines
.

0013143

Fig
.
5
.
After
removing
exhaustsystem,
remove
heat
shield
screws
(arrows)
and
heat
shield
.

9
.
Working
underneath
car,
loosen
hose
clamp
and
dis-

connect
filler
hose
.

10
.
Support
tank
from
below
.
Remove
tank
strap
mounting

bolts
.
Lower
and
remove
tank,
disconnecting
right
side



TheE36
model
uses
a
two-lobed
fuel
tank
and
each
lobeof
vent
and
other
hoses/electrical
connectors
as
neces-



the
tank
has
its
own
fuel
level
sending
unit
.
sary
.

11
.
Installation
is
reverse
of
removal
.

"
Always
use
new
seals,
gaskets,
O-rings,
and
hose
clamps
.

"
Inspect
hoses
and
replace
any
that
are
chafed,
dried

outor
cracked
.

"
Inspect
heat
shield
and
replace
if
corroded
.

"
Inspect
rubber
buffers
and
liners
on
fuel
tank,
support
straps
and
on
underside
of
body
.
Replace
rubber

parts
that
are
hardened
or
damaged
.

FUEL
LEVEL
SENDERS

CAUTION-

"
Before
starting
the
engine,
fill
the
fuel
tank
with
at
least
1.5
gallons
(5
liters)
of
fuel
to
prevent

damaging
a
dry
fuel
pump
.

"
If
the
filler
neck
has
been
removed
from
the
body,
be
sure
toreattach
theneck's
grounding
screw
(where
applicable)
.
Check
electrical
resistance
between
the
ground
tab
and
wheel
hub
.
The
re-
sistance
shouldbeno
higher
than
0
.6
ohms
.

Tightening
Torques

"
Fuel
tank
to
body
.............
...
23
Nm
(17
ft-Ib)

"
Hose
clamps
(10
mm-16
mm
día
.)
..
2
.0
Nm
(18
in-lb)

Fuel
Tank
Evaporative
Control
System

The
fuel
tank
evaporative
control
system
is
used
to
vent
the

fuel
tank
to
a
charcoal
canister,
which
is
then
purgedby
en-

gine
vacuum
during
normal
engine
operatíon
.
This
controls

emission
of
raw
hydrocarbons
(fuel)
to
the
atmosphere
.
See

Fig
.
1
.

A
fuel
expansion
tank,
located
under
the
right
rear
fender,

traps
overflow
fuel
and
incorporates
extra
fuel
tank
plumbing
.

Startingwith
1996
models,
OBD
II
standards
require
that

the
fuel
tank
evaporative
control
system
be
monitored
for

leaks
.
This
is
accomplished
usingthe
fuel
tankpressuresen-

sor,
the
ventshut
off
valve,
and
the
evaporative
purge
valve
.

NOTE-

On
most
early
cars(1992-1995),
the
charcoal
canister

is
in
the
engine
compartment
.
On
latercars,
the
char-
coal
canister
is
under
the
spare
tire
in
the
luggage
com-
partment
.

FUEL
LEVEL
SENDERS

The
right
side
fuel
leve¡
sender
is
integrated
with
the
fuel

pump
.
Each
senderhas
a
float
connected
to
a
variable
resis-

tance
for
fuel
leve¡
.
When
replacing
the
sender/pump
assem-

bly
always
replace
hose
clamps,gaskets
and
O-rings
.

WARNING
-

When
removing
the
fuel
level
sender
or
the
fuel
pump,
the
fuel
tank
should
be
emptied
.

160-
8



FUEL
TANK
AND
FUEL
PUMP

UU131
tst5

Fig
.
11
.
Voltage
supply
to
fuel
pump
harness
(black)
connector
being
checked
(arrow)
.

00131ts7

Fig
.
12
.
Test
fuel
pump
for
current
draw
by
attadhing
ammeter
andjumper
wire
as
shown
.

CAUTION-

Do
not
allow
the
test
leads
to
short
to
ground
.

NOTE-

See
600
Electrical
System-General
for
information
on
electricaltests
using
a
digital
multimeter
(DMM)
.

4
.
Run
pump
as
described
in
Operating
fuel
pump
for
tests
.

FUEL
PUMP

5
.
Compare
ammeter
reading
with
specification
listed
in

Table
b
.

Maximum
current



5
.0
amps
consumption

FuelDelivery
Tests

Table
b
.
Fuel
Pump
Current

Checking
fuel
delivery
is
a
fundamental
part
of
trouble-

shooting
and
diagnosing
the
DME
system
.
Fuelpressure
di-

rectly
influences
fuel
delivery
.
An
accurate
fuel
pressure

gauge
will
be
needed
to
make
the
tests
.

There
arethree
significant
fuel
delivery
values
to
bemea-

sured
:

"
System
pressure-created
by
the
fuel
pump
and
main-

tained
by
the
pressure
regulator
.

"
Fuel
delivery
volume-created
by
the
fuel
pump
and
af-

fected
by
restrictions,
suchas
clogged
fuel
filter
.

"
Residual
pressure-the
pressure
maintained
in
the

closed
system
after
the
engine
and
fuel
pump
areshut

off
.

Procedures
for
measuring
the
first
two
quantities
arede-

scribed
here
.

Residual
fuel
pressure
is
checked
using
the
procedurede-

tailed
in
130
Fuel
Injection
.

Relieving
fuel
pressure
and
connecting

fuel
pressure
gauge

WARNING
-

"
Gasoline
is
highly
flammable
and
its
vaporsare
explosive
.
Do
not
smoke
or
work
ona
car
near
heaters
or
other
fire
hazards
when
diagnosing
and
repairing
fuel
system
problems
.
Have
a
fire
extinguisher
available
in
case
of
an
emergency
.

"
When
working
onan
open
fuel
system,
wear
suit-
able
hand
protection
.
Prolonged
contact
with
fuel
can
cause
iflnesses
and
skin
disorders
.

CA
UTION-

Cleanliness
is
essential
when
working
withfuel
circuit
components
.
Thoroughly
clean
the
unionsbefore
disconnecting
fuel
fines

To
prevent
fuel
from
spraying
on
a
hotengine,
system
fuel

pressure
should
be
relieved
before
disconnecting
fuel
lines
.

One
method
is
to
tightly
wrap
a
shop
towel
around
a
fuel
line
fit-
ting
and
loosen
or
disconnect
the
fitting
.

Measuring
fuel
pressure
requires
special
tools
.
Earlier
cars
use
pressure
hose
with
clamps
for
fuel
delivery
.
These
can
be
attached
to
a
fuel
pressure
gauge
below
the
intake
manifold
.

NOTE-



NOTE
-

On
1996
and
later
4-cylinder
cars,
use
BMW
special



"
Use
BMW
pressure
gauge
Part
No
.
133
060,or
an
tool
13
6051
(hose
with
quick
release
coupling)
toat-



equivalent
.
The
fuel
pressure
gauge
should
have
a
tach
pressure
gauge
to
Shraeder
valve
fitting
on
top
of



rangeof
0
to
5bar
(0
to
75
psi)
and
mustbe
securely
the
M44
fuel
rail
.
See
Fig
.
13
.



connected
to
prevent
it
from
coming
loose
under
pres-
sure
.

u012503a

Fig
.
13
.
Fuel
rail
showing
location
of
Shrader
valve
fitting
on
M44
en-
gine
(arrow)
.

Later
model
6-cylinder
fuel
systems
require
BMW
specíal

tool
16
1
050
to
release
fittings
and
connect
the
fuel
gauge
.
See
Fig
.
14
.

0012699

Fig
.
14
.
Fuel
lines
at
rear
of
íntake
manifold
on
M52
engine
.
Use
BMW

special
tool
16
1
050
to
release
fittings
.

If
the
special
tools
arenot
available,
a
length
offuel
line
and

a
T-fitting
can
be
installed
tothe
inlet
fuel
line
and
connected

to
a
fuel
gauge
.

FUEL
TANK
AND
FUEL
PUMP



160-
9

"
On
cars
with
6-cylinder
engine,
thetop
left-side
en-
Bine
cover
will
have
to
be
removed
to
access
the
fuel
rail
.

System
pressure,
testing

System
pressure
is
the
pressure
created
by
the
fuel
pump
and
maintained
by
the
pressure
regulator
.
See
Fig
.
15
.
Sys-
tem
pressure
is
not
adjustable
.

1
.
Remove
fuel
tank
filler
cap
.

Fig
.
15
.
Fuel
pressure
regulator
.
Fuel
pressure
deflects
diaphragm
to
retum
fuel
to
tank
when
pressure
reaches
desired
limit
.

CA
UTION-

The
fuel
pump
is
capable
of
developing
a
higher
pressure
than
that
regulated
by
the
pressure
reg-
ulator
.
In
the
event
the
fuel
pump
check
valve
is
faulty
(stuck
closed),
make
sure
the
fuel
pressure
does
not
rise
aboye
6
.0
bar(87
psi)
.
Damage
to
the
fuel
fines
or
fuel
system
components
could
re-
sult
.

2
.
Connect
in-fine
a
Tfitting
and
fuel
pressure
gauge
to

outlet
hose
atfuel
pump
.

FUEL
PUMP

ELE-74
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9
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6
I
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10
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TPUT
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CLR



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I
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PDSENSSHD



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CONVERTER
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ENSOR
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L



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0
GRV/VEL
3
ICK-DO
W
N
SIG
1
VEL/WH7



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TRANSMISSION
WHT/
BLK

Transmission
Electronics

1992
3181,
318is,
3251
&
325is

HOTATALL
TIMES



r



_JFRONTPOWER



r_
__
__
_1
_,
B+



FUBE



FUSE



FUSE



DISTRIBUTION
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'
JUNCTION
I
F26



F28



F48
I
L



L
161L
--
121l



16-J



RED/WHT



RED
"
RED/WHT
"
167q
3z



xi
.DOiB



{L
_CON7R
__
J
I
6
xiDD-tz



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I
ENGINEOL
I
VIO/VEL



I



MODULERELAY
I
GRN/
OR
./
SYSTEM
RED
I



WHT
GRYI



"



ENGINE
I



I
"
~



CONTROLS
I



I
YSTEM

{5
___J
I

HOTINRUN



HOT
IN
SUN



HOT
IN
ACCV,RUN
&START
&51ART
&START

K
MAN
MODESIG



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VALVE
UNIT
~
J
32
3BR
.IW
.T



BLK
74
GO
RNG
BIGL4f
ION-BOARD
FLPT



MPRLYCTRL
S-PROGBUTTON



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VEL/GRN
5BRN/VID



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ION-BOARD



B
W
RN/HT/
OB
R
L
G
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SHIFTLKGND



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--
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U
48
VOLTSUPPLV



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37
RED/WHT



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TCCSOLCTRL
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IDRNVERANGEP/N
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CONTROLRELAV
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UNIT
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PUELCONSUMPTION
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UTPUT
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2



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DIMMER
1III
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_
_
_
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INTERIOR
LIGHTS
SYSTEM

Transmission
Electronics

1993-94
318i,
318iC
&
318is

HOTINRUN



HOT
IN
RUN



HOT
INADDY,
RUNHOTATALL



&START&START&START
TIMES



~-
-



_-



FRONTPOWER
r
-
[
IB+



FS
FUSE



FUSE
F2



F46
DISTRIBUTIQN00X



5
-
BRNIGRN
~
I
PU
O
NICTION



US
E
I



I
F26



8



I



--
I

LJ



L
1
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FUELPUMPRELAY
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-
Y
--
-
16



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GRN/I
GRN/
VIO/VELr



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--
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I
"
1



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I



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/CCM



W/OCCM
,
qED/WHT


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r_
-
II
VEL



VEL
_
BRAKE



BRAKE
r
(LIGHT
I
I~+
'LIGHT
.
iSWITCH



1
/
WIT(

RE
V
D
I



GYEL1



ORG

BRN(
1
"
BANr

BRNBRN(
1

ELECTRICAL
WIRING
DIAGRAMS
ELE-97

TRANS
MISSIONCONTROL



I



I



BLU/BLK



4
MODULE
(EGS)

BRN/BLK



GRNlWHT
2
VEL/BLU



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OFF
R
EXTERIOR



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BLU/YEL
3
LIGHTS,



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(-~
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CLOSEDIN
T



REVERSE
G123
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S
A4S
310R
GRY
POSITION



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L7
L2L3
L4



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t
INDICATOR
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KICK
t
P
11
0
1



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B
LIGHT



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1DOWN



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I



1
X1974



gANGESWITCHR
1
000
SWITCH



I
&B
I



I



I



I



I'
N
111
0
0
000
1
300
11
2
1
0
111a
o
1
0

I
-I



CRUISE
CONTROL



I
_I
STARTER
RELAY



MODULE



ON-BOARD
1_



(TEMPOMAT)
.
.COMPUTER
(MULTI-FUNCTION
71706



G201



CLOCK)

I
L___JI
RED/I



,I



ENGINE
CONTROL
WHT



MODULERELAY
L_
_j

VIO/j
VIOL
"
67A

-



FRONT
POWER
ENGINE



DISTRIBUTION
BOX
CONTROLS
SYSTEM