FUEL TANK
AND
EXHAUST SYSTEMS
8-13
CHEVY II
FUEL TANKS
INDEX
Page
Page
General Description.
8-13
Component Part Replacement
8-13
Fuel Tanks
8-13
Fuel Lines
8-14
Metering Units (Gauge Sending Unit)
8-13
Fuel Tank Filler- Neck Caps.
. . 8-14
Fuel Tank Vent Lines .......
8-14
GENERAL DESCRIPTION
ANTI-SQUEAK
MA'
ANTI-SQUEAK
MATERIAL
SEDANS
STATION WAGON
Fig.
15-Chevy
II
Fuel Tanks
All Chevy
II
Models have
16
gallon capacity (approx.)
fuel tanks mounted between
the
frame rails
to the
rear
of
the rear axle
(fig. 15). The
fuel tanks
are
basically
the
same
for the
passenger
car
and two-seat,
six
passenger
station wagon models. The tanks
are
held
in
place
by two
metal straps attached individually
to the
underbody
at
each
end. The
straps hinge
at the
forward
end
and secure
the tank
at the
rear with
an
adjustable bolt and nut
ad-
sembly. The tank rests against the rear compartment
pan
reinforcement.
The
two-seat station wagon
gas
tank
is
secured
to the
contour
of
forward
and
rear underbody
brackets.
The
filler neck
is
accessible
by
removal
of a
fender
gas cap at the
rear left fender location.
A fine mesh screen
is
located
at the end of the
fuel
pickup pipe
to
prevent
the
entrance
of
dirt into
the sys-
tem.
The
tank
can be
drained
by
siphoning
at the
filler
neck
or by
removing
the
gauge sending unit and siphon-
ing
at the
tank opening.
CAUTION: Care should
be
exercised
to
avoid
denting
or
puncturing
the
fuel tank when
in-
stalling
or
removing.
~
COMPONENT PART REPLACEMENT
FUEL TANKS
Draining Tank
The absence
of a
drain plug
in
the Chevy
n
Model
gas
tanks makes
it
necessary
to
siphon fuel from
the
tank
when draining
is
needed. Refer
to the
recommended
draining procedures previously outlined under Chevrolet
Models
in
this section.
Removal
and
Installation
1.
Drain fuel tank.
2.
Raise
and
support vehicle.
3.
Disconnect
the
filler neck inlet hose
and the
vent
connection
(fig. 15).
4.
Remove
the gas
tank sending gauge unit access hole
cover
on
station wagons.
5. Disconnect fuel tank gauge sending unit with special
spanner Tool J-8950, detach wire
and
fuel pickup
line
at the gas
tank.
6. Remove tank support straps and lower tank carefully.
7. Reverse procedure
to
install.
The sending units
are
located on
the top
forward
end of
the
gas
tanks.
The
fuel strainer
is
located
at the end of
these sending units.
FUEL TANK GAUGE SENDING UNIT
AND FUEL STRAINER
(Fig. 16)
Replacement
1.
Drain tank
to a
level below
the
unit.
2.
Disconnect fuel pickup line
and
gauge unit wire.
3.
Use
special Tool J-8950
to
remove
cam
lock.
Re-
move unit and rubber gasket.
CHEVROLET CHASSIS SERVICE MANUAL
FUEL TANK
AND
EXHAUST SYSTEMS
8-18
CORVETTE
FUEL TANK
INDEX
Page
General Description.
. 8-18
Service Operations
8-18
Fuel Tank
8-18
Gauge Sending Unit
8-20
Fuel Lines.
8-20
GENERAL DESCRIPTION
20 GALLON TANK
Fig.
21
—Corvette Fuel Tanks
The Corvette
is
equipped with
a
standard
20
gallon
(approx.) tank
or an RPO 36
gallon (approx.) fiberglass
tank
(fig. 21). The
tanks
are
installed
at the
very rear
of
the
vehicle, convenient
for
direct fuel filling into
the
tank.
The
tanks
are
held
in
place
by
two metal straps
at-
tached individually
to a
removable
gas
tank frame
sup-
port.
Two
guides
at the end of
the straps
are
adjustable
for securing
the
straps onto
the
tank support. The tank
support
is
secured
to the
frame rail with flat washers,
lockwashers, bolts
and
nuts.
The
tanks' rest
on six
felt
anti-squeak pads.
One pad
centers
on the
rear frame
crossmember
and one at
each side
on the
same cross-
member.
At the
same rear location two pads
are
placed
on
the
tank
at the
metal support strap (rear) attachment
location
and
another anti-squeak
pad
cemented
on the
support
at
the front
of
the tank.
The fuel tanks
are
equipped with
a gas
gauge metering
unit,
a
fuel pickup, fuel strainer
and
vent line.
If it be-
comes necessary,
the
tank
can be
completely drained
by
removing
the
fuel pickup hose which
is
located
at
the
bot-
tom
of the
tank,
or
by removing the metering
for
quicker
draining.
A pressure vacuum type, positive vented design
cap,
conforming
to
I.C.C. regulations,
is
used on both regular
production
and
optional fuel tanks.
The cap is
inter-
changeable with past model tanks
for
service replace-
ment purposes.
SERVICE OPERATIONS
FUEL TANK
CAUTION:
IF THE GAS
TANK SHOULD
BE
REMOVED
AND
INSTALLED, CARE SHOULD
BE EXERCISED
TO
AVOID PUNCTURING,
DROPPING
OR
DENTING
THE GAS
TANK.
Removal
(20
Gallon Tank)
WARNING: FIRST REMOVE BATTERY
CABLE.
1.
Remove
the
spare tire from tire carrier.
2.
Remove spare tire carrier bolted attachments
and
carrier
(fig. 22).
3.
Remove
the "U"
bolt attachments
at
both rear tail
pipe
(See
Figure
23).
4.
Separate
the
exhaust system
at
the transmission sup-
port crossmember
by
loosening
the "U"
bolt nuts.
5. Remove both rear muffler brackets from
the
frame
and slide
the
muffler system rearward.
CHEVROLET CHASSIS SERVICE MANUAL
FUEL TANK AND EXHAUST SYSTEMS 8-20
4.
Attach the retaining straps with strap guide attached
to the fuel tank support, and secure with-the nut and
lockwasher assembly.
5. Connect the filler neck boot to the drain hose of the
tank and install boot around filler neck,
6. Connect the fuel pickup line, ground wire and make
certain that the fuel drain line is flush to 1/2" in-
board of the rear bumper opening.
7. Attach tank metering unit wires (fig. 25).
8. Replace fuel in tank. Replace gas cap.
9. Check for possible leaks.
10.
Reconnect the exhaust system by reversing the above
removal procedures (see "Exhaust System").
11.
Install spare tire carrier by securing the bolt
attachment.
12.
Install the spare tire in the tire carrier.
Removal (36 Gallon Tank)
1.
Remove cover (fig. 26).
2.
Disconnect hoses and drain tank and remove two
fittings at bottom of tank.
3.
Disconnect fuel and vent lines and wires at tank
(fig. 27).
4.
Remove straps.
installation (36 Gallon Tank)
Reverse removal procedure to install.
FUEL TANK METERING UNIT OR GAUGE
SENDING UNIT AND STRAINER
The fuel tank metering unit is located at the bottom of
the fuel tank. The fuel strainer is attached at the end of
the sending unit inside the tank.
Replacement (20 Gallon Tank)
1.
Follow fuel tank removal procedure through Step 2.
2.
Drain the tank. Disconnect the attaching wires.
3.
Remove metering unit with a fuel tank gauge unit
Spanner J-8950 (revised).
4.
'Remove metering unit and gasket.
CAUTION: Carefully remove unit so as not to
damage screen on the end of the pipe.
5. Clean strainer screen by blowing out with com-
pressed air.
6. Reverse procedure to install.
Replacement (36 Gallon Tank)
1.
Remove cover.
2.
Follow Steps 2 thru 6 as outlined under replacement
for 20 gallon tank.
FUEL LINES
20 Gallon Tank
The fuel lines are conveniently located along the out-
side of the right frame rail (fig. 28). The lines extend
Fig.
26—Gasoline Tank (36 Gallon) Compartment Cover
from the fuel tank pickup at the bottom of the tank, along
the rear frame crossmember to the right frame rail,
extending through the rail at the kickup area and along the
top inside edge of the frame to the fuel pump, Flexible
hoses are located at the fuel tank pickup and at the fuel
pump.
36 Gallon Tank
The 36 gallon tank fuel lines are routed from the bot-
tom of both sides of the tank to the right frame rail
(fig. 20).
Maintenance
CAUTION: Always drain gasoline from the
complete fuel system including carburetor, fuel
pump and all fuel lines and fuel tank if the vehi-
cle is to be stored for any great length of time.
This precaution will prevent accumulation~ol
gum formation and resultant poor engine
performance.
. The fuel lines should occasionally be inspected for
leaks,
kinks or dents, especially when work has been
done on the underside of car or after the car has been
traveling over rough or stone roads at higher speeds.
If evidence of dirt is found in the carburetor or fuel pump
at disassembly, the lines should be disconnected and
blown put. Check the fuel tank strainer for damage or
omission.
Fuel lines are beaded-type ends for connection to
hoses and flared ends for secure metal-to-metal line
connections.
CHEVROLET CHASSIS SERVICE MANUAL
FUEL TANK AND EXHAUST SYSTEMS 8-28
assembly is mounted on top of the tank and cannot be
removed for service without lowering the tank. The
upper filler neck assembly is routed through an opening
in the rear panel above the bumper and through the trunk
floor pan (fig. 33). The filler neck is not centered in the
rear panel but offset to the right to obtain the proper fill
rate.
The fuel pickup pipe is an integral part of the tank
meter unit^ located at the top front center of the tank. A
fine mesh screen is located at the bottom end of the fuel
pickup pipe to prevent the entrance of foreign material
into the fuel system.
Fig.
33—Filler Neck Assembly
COMPONENT PART REPLACEMENT
FUEL TANK
Draining Tank
Refer to Chevrolet page 8-2.
Removal and Installation
1.
Drain fuel tank. .'...' .
2.
Raise vehicle.
3.
Disconnect fuel pickup line, gauge wire and ground
lead from tank unit.
4.
Loosen filler neck inlet hose clamp.
5. Remove tank support strap bolts and straps, then
lower tank carefully.
6. Reverse procedure to install.
FUEL TANK GAUGE SENDING UNIT (Fig. 34)
Replacement
1.
Remove fuel tank.
2.
Remove cam lock using special Tool J-8950.
3.
Remove meter unit and rubber gasket.
CAUTION: Carefully remove unit so as not to
damage screen on end of pipe.
4.
Clean screen by blowing out with compressed air.
5. Reverse removal procedure to install.
FUEL LINES (Fig. 35)
The gasoline lines extending from fuel tank to fuel
pump,
are routed on the underside of the underbody, on
the right side, opposite the single exhaust system. The
lines extend from the fuel tank to the right side of the
engine to the fuel pump and over the front of the engine
to the carburetor.
Maintenance
CAUTION:
plete fuel
Always drain gasoline from corn-
including carburetor, fuel
pump and
fuel lines and fuel tank if the
vehicle is to be stored for any
eciable
length of time. This precaution will prevent
accumulation of gum formation and resultant
poor engine performance.
The fuel lines should occasionally be inspected for
leaks,
kinks, or dents. If evidence of dirt is found in the
carburetor or fuel pump disassembly, the lines should be
disconnected and blown out. Check the fuel tank strainer
for damage or omission. Fuel lines are of 5/16" diameter
tubing for regular installation with beaded-type ends for
connections to hoses and flared ends for secure line
connections.
CHEVROLET CHASSIS SERVICE MANUAL
ELECTRICAL-BODY AND CHASSIS 12-35
SERVICE OPERATIONS
INSTRUMENT CLUSTER
REMOVAL AND INSTALLATION (Fig. 49)
1.
Remove mast jacket assembly. Refer to Section 9
for removal procedures.
2.
Disconnect tachometer drive cable at distributor.
3.
Disconnect the headlamp panel control switch from
instrument cluster.
4.
Remove lighting switch as outlined in this section.
10 10-A 1112 13
14
15 16 17 18 19
Fig.
49- Instrument Cluster Connections
1.
Cluster Illuminating
Bulbs
2.
Direction Signal Indicator
Bulb L.H.
3. Direction Signal Indicator
BulbR.H.
4.
Headlamp Actuating Motor
Indicator
5. Headlamp Hi Beam
Indicator
6. Parking Brake Alarm
Indicator
7. Ground Lead Attaching
Point
8. Temperature Indicator
"1"
Terminal
9.
10.
10A.
11.
12.
13.
14.
]5.
16.
17.
18.
19.
20.
21.
Temperature Indicator "S"
Terminal
Ignition Switch Receptacle
ignition Switch Illuminating
Bulb
Oil Pressure Indicator
Tachometer
Lighter Receptacle
Trip Odometer
Wiper Switch Receptacle
Speedometer
Ammeter "Gen" Terminal
Ammeter "Battery" Terminal
Lighting Switch Receptacle
Fuel Gauge
"1"
Terminal
Fuel Gauge "S" Terminal
5. Remove the ignition switch. Refer to Section 6Y
for removal procedure. Then disconnect ignition
switch lamp support at instrument panel.
6. Disconnect oil pressure line at oil pressure gauge
then remove the lead wires from ammeter, wiper
switch and cigarette lighter. Disconnect trip odom-
eter at mast jacket support.
7. Remove the instrument cluster-to-dash retaining
screws and pull cluster assembly slightly forward
to obtain clearance for removal of speedometer
cable, tachometer cable, cluster ground wire, fuel
gauge lead wires and remaining indicator and cluster
illuminating lamps.
8. To install cluster in dash panel, reverse removal
procedure.
FUEL GAUGE
The gasoline fuel gauge circuit consists of an electri-
cal indicator in the instrument cluster and a float-
controlled rheostat in the fuel tank.
Since the fuel gauge consists of two remotely located
units and connecting wires, it is sometimes difficult to
determine which unit is at fault when the gauge fails to
operate properly. Cluster removal is necessary to re-
place the fuel gauge.
NOTE:
Be sure to check gas gauge fuse in fuse
panel before attempting to trouble shoot for
inoperative gauge or tank sending unit.
SPEEDOMETER AND/OR TACHOMETER
Removal and Installation
Cluster must be removed from vehicle to service
speedometer head assembly (see Cluster Removal pro-
cedure)
.
With cluster removed from vehicle:
1.
Remove five screws securing cluster back panel to
cluster assembly; separate the parts carefully.
CAUTION: Care must be used to avoid marring
instrument cluster face.
2.
Remove two screws securing speedometer or ta-
chometer head to cluster back panel; carefully re-
move speedometer or tachometer head.
NOTE:
Servicing of speedometer or tachom-
eter head should be performed by an authorized
AC service station.
3.
Reverse above procedure to install speedometer.
Cable Replacement or Lubrication
1.
Disconnect the. cable from the speedometer or ta-
chometer head. Remove the old cable by pulling it
out from speedometer end of conduit.
NOTE:
If old cable is broken it may be nec-
essary to remove lower piece from transmission
or distributor end of conduit as applicable.
2.
Lubricate the lower 3/4 of cable with
AC
speedom-
eter cable lubricant and push the cable into the con-
duit. Connect the upper end to the speedometer or
tachometer head and road test vehicle for proper
operation.
TEMPERATURE GAUGE
The temperature indicator requires very little service
other than testing for malfunctioning and replacing de-
fective units. Cluster must be removed to service tem-
perature gauge.
Do not attempt to repair either the engine unit or the
gauge. When installing new engine unit, do not use
thread compound on unit threads, as this will increase
electrical resistance of unit and cause faulty reading
on gauge.
AMMETER OR OIL PRESSURE GAUGE
The ammeter or oil pressure gauge requires very
little attention other than keeping ammeter terminals
clean and tight. If the oil pressure control line should
become restricted it should be blown out or replaced.
Cluster must be removed to service these gauges.
HftVKI MANUAL
SECTION 14
INDEX
Page
General Description—Chevrolet 14-1
Service Operations 14-1
Front Bumper Assembly 14-1
Removal 14-1
Disassembly . 14-1
Assembly „ 14-1
Installation . . 14-1
Bear Bumper Assembly 14-2
Removal .' 14-2
Disassembly . 14-2
Assembly 14-2
Installation 14-2
General Description—Chevelle 14-2
Service Operations 14-2
Front Bumper Assembly 14-2
Removal 14-2
Disassembly 14-3
Assembly 14-3
Installation 14-3
Rear Bumper Assembly 14-3
Removal . . 14-3
Disassembly 14-3
Assembly . . . . 14-3
Installation 14-3
General Description—Chevy II 14-3
Service Operations 14-3
Front Bumper Assembly 14-3
Removal 14-3
Page
Disassembly 14-4
Assembly 14-4
Installation . 14-4
Rear Bumper Assembly . 14-4
Removal 14-4
Disassembly 14-4
Assembly ..................... 14-4
Installation 14-4
General Description—Corvette 14-4
Service Operations . 14-4
Front Bumper Assembly . . 14-4
Removal 14-4
Installation . . 14-5
Rear Bumper Assembly 14-5
Removal 14-5
Installation 14-5
General Description—Camaro 14-6
Service Operations . 14-6
Front Bumper Assembly 14-6
Removal. . 14-6
Disassembly 14-6
Assembly 14-6
Installation 14-6
Rear Bumper Assembly 14-6
Removal . 14-6
Disassembly 14-6
Assembly 14-6
Installation 14-7
GENERAL DESCRIPTION-CHEVROLET
The front bumper is a new, full width, three-piece
design consisting of a center and two end face bars.
Two holes are pierced in the center face bar for the
parking lamps. The bumper attaching brackets are
lengthened to attach in common with new front bumper
diagonal braces.
The rear bumper is a new three-piece design similar
in general appearance to the 1966 design. Caprice mod-
els have pierced holes in the center portion of the bumper
for the back-up lamps with the other models incorporat-
ing the back-up, lamps with the tail lamps. The fuel tank
filler door assembly remains the same as the 1966
models.
SERVICE OPERATIONS
FRONT BUMPER ASSEMBLY (Fig. 1)
Removal
1.
Raise and support front end of vehicle.
2.
Disconnect parking lamp wiring.
3.
Remove bolts attaching bumper brackets and braces
to frame.
4.
Remove bumper from vehicle.
Disassembly
1.
Remove bolts attaching brackets and braces to
bumper.
2.
Separate face bar sections by removing two bolts at
each joint.
3.
Remove screws attaching each parking lamp assem-
bly to center face bar and remove parking lamps.
Assembly
Attach both parking lamps to center face bar and
tighten bolts firmly. Assemble the front bumper follow-
ing the disassembly procedure in reverse order. Except
for parking lamp attachments, install all bolts loosely; do
not tighten any bolts until all bolts are installed.
Installation
1.
Position assembled bumper on frame horns aligning
holes in bumper brackets and braces with those in
frame.
2.
Install bolts, lock washers, and nuts; do not tighten.
Note that eight sided adjustment washers (fig. 1) are
CHEVROLET O-
SERVICE