ECU CHEVROLET CAMARO 1967 1.G Chassis Manual PDF

FUEL TANK AND EXHAUST SYSTEMS 8-9

SEDAN
STATION WAGON AND PICKUP

Fig.
8—Fuel Tanks

FUEL TANK VENT LINE

Sedan model fuel tanks are vented to the atmosphere

at the top right forward edge of the tank. The vent line

is connected by a rubber hose with two clamps one at the

tank and the other at the vent pipe which is secured to the

underbody as shown in Figure 8. A rubber grommet

around the vent pipe acts as a seal to prevent gasoline

fumes from entering the passenger compartment.

IMPORTANT: It is important to note that the

gas tank is not vented at the cap; therefore, it
is necessary to be assured that the vent line is

free from dirt, etc., and that the gas tank vent

line is open at all times. If gasoline fumes are

detected, the rubber grommet should be checked.

Station wagon and pickup model tanks are vented from

the tank to the filler neck (fig. 9) and use a vented cap.

The vent outlet pipe on the tank is connected to the vent

inlet pipe on the filler neck by a rubber hose. The hose

is secured with two wire clamps.

Fig.
9—Filler Neck and Vent Assemblies
Fig.
10—Installing Fuel Line Retainer Clip

CHEVROLET CHASSIS SERVICE MANUAL

FUEL TANK AND EXHAUST SYSTEMS 8-11

EXHAUST SYSTEMS

INDEX

Page

General Description 8-11

Component Part Replacement 8-12

Muffler Assembly 8-12

Exhaust Pipes. 8-12

Tail Pipes 8-12

GENERAL DESCRIPTION

V-8

VIEW C
VIEW D

(EXCEPT WAGON)

L-6
VIEW A

Fig.
13—Single Exhaust System

The single exhaust system used on all six cylinder

engine models consists of an exhaust pipe, muffler and

tail pipe (fig. 13), An exhaust crossover pipe is added on

V-8 engine single exhaust models to connect the exhaust

manifolds to the system. A dual exhaust system, availa-

ble on V-8 engine models includes two exhaust pipes,

mufflers, and tail pipes and attaching hardware (fig. 14).

All systems are suspended on brackets with insulators

for rattle free operation.

The mufflers are a seam rolled construction with spot

welded baffles, with a capacity for muffling the exhaust

and at the same time, minimizing back pressure for
maximum engine efficiency. The internal parts of the

muffler are spot welded in position while external parts

are electric arc-welded to eliminate a chance of pre-

mature failure or rattle.

The exhaust system center mounting at the muffler lo-

cation (fig. 13) consists of an underbody bracket, an insu-

lator and a clamp. The clamp holds the muffler and tail

pipe with a "U" bolt and at the same time secures the

muffler and pipe to the body.

The exhaust system mounting at the end of the tail pipe

secures the pipe to a bracket assembly and insulator at-

tached to an existing underbody bracket (fig. 13).

CHEVROLET CHASSIS SERVICE MANUAL

FUEL TANK AND EXHAUST SYSTEMS 8-12

Fig.
14—Dual Exhaust System

COMPONENT PART REPLACEMENT

MUFFLER ASSEMBLY

Replacement (Service)

1.
Cut the exhaust pipe near the muffler to allow suf-

ficient pipe for muffler replacement:

CAUTION: Before cutting the exhaust pipe

measure service muffler exhaust pipe extension

and make certain to allow 1-1/2" for engage-

ment of exhaust pipe' into muffler extension.

2.
Remove "U" bolt clamp at center mounting and dis-

engage muffler from tail pipe.

3.
Install new muffler and secure with new
"U"
/bolt

clamps. •

4.
Realign and check clearances before finally tighten-

ing all hardware.

NOTE:
If bracket mounting insulators (tire

carcass mountings) are fatigued, replace to

insure a secure exhaust system.

EXHAUST PIPE

Replacement

On V-8 single exhaust models, if the left exhaust pipe

has to be replaced it will be necessary to replace both

the exhaust pipe and muffler with service replacement
parts.
The right exhaust crossover pipe may be replaced

without replacing the entire system as follows:

1.
Remove nuts attaching left and right exhaust pipes

to exhaust manifolds. ' • .

2.
Remove "TJ" bolt clamp retaining right exhaust pipe

to exhaust system and remove pipe.

3.
Using new manifold flange gaskets, install new ex-

haust pipe.

NOTE:
Check all clearances before tightening

hardware.

TAILPIPE

Replacement

1.
Remove clamp attachment at muffler and at tail pipe

rear hanger.

2.
Disengage tail pipe from muffler and remove from

vehicle.

3.
Install tail pipe to rear of muffler.

4.
Position tail pipe to obtain proper clearance to rear

spring bracket and underside of frame rail.

5. Install tail pipe clamp over rear hanger and position

on pipe to maintain vertical position of insulator

without twist.

6. Tighten nuts on "TJ" bolt clamp at rear of muffler,

then secure rear tail pipe clamp.

CHEVROLET CHASSIS SERVICE MANUAL

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 8-14

CAUTION: Carefully remove unit so as not to

damage screen oh the end of the pipe,

4.
Clean screen by blowing out with compressed air.

5. Reverse procedure to install.

FUEL LINES (Fig. 17)

The gasoline lines are routed on the underside of the

underbody prop shaft tunnel off center, on the right side,

opposite the single exhaust system. The lines extend

from the fuel tank, joint the brake lines on dual clip

assemblies, and then 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 com-

system including carburetor, fuel

pump and all fuel lines and fuel tank if the

vehicle is to be stored for any appreciable

length of time. This precaution will prevent ac-

cumulation 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" di-

ameter tubing for regular installation with beaded-type

ends for connections to hoses and flared ends for secure

line connections.

FUEL TANK VENT LINE (Fig. 18)

The
gas
tanks
are
vented from
the
filler neck near
the

filler neck opening with
3/16"
tubing which extends

underneath
the
vehicle
to the
front
of the gas
tank.

IMPORTANT:
It is
important
to
note that
the

gas tank
is not
vented
at the cap;
therefore,
it

is necessary
to be
assured that
the
vent line
is

free from dirt,
etc., and
that
the gas
tank vent

line
is
open
at all
times.

At
the
filler neck
the
vent line
is
wedged into
an
open-

ing
and
secured
by a
snap-on clamp.
The
vent line
is

connected
by a
rubber hose with
two
wire clamps
at the

gas tank location
and
routed
to the gas
tank hinge strap

access hole where
the
tubing
end is
protected
by a
rubber

grommet
and a
screw
and
shield secured
in the
hole
at

the strap
end.
FWD.

SEDANS

6-PASS.

STATION WAGON

Fig. 16—Fuel Tank Gauge Sending Units and Strainers

CHEVROLET CHASSIS SERVICE MANUAL

FUEL TANK AND EXHAUST SYSTEMS 8-16

EXHAUST SYSTEMS

INDEX

Page

General Description 8-16 Exhaust Pipes.

Component Part Replacement . 8-17 Tail Pipes. . .

Muffler Assembly 8-17
Page

8-17

8-17

GENERAL DESCRIPTION

Fig.
19-Cheyy If—Single Exhaust Systems

The single exhaust system on Chevy II models for six

cylinder engines (fig. 19) consists of an exhaust pipe,

muffler and tail pipe. On V-8 engines with single exhaust

assemblies (fig. 19) an exhaust crossover pipe is added

to connect the right exhaust manifold to the system. A

dual exhaust system (fig. 20), available on the V-8 engine

(except station wagons) includes two exhaust pipes,

mufflers, tail pipes with resonators and attaching

hardware.

The assemblies are secured to the engine at the ex-

haust manifolds, to the center mounting at the muffler
location and adjacent to the gas tank at the end of the

tail pipe. The assemblies are suspended on brackets with

insulators for rattle free operation.

The muffler is an all-welded construction with a ca-

pacity for muffling the noise and at the same time,

minimizing back pressure for maximum engine ef-

ficiency. The internal parts of the muffler are spot

welded in position while external parts are electric are

welded to eliminate a chance of premature failure or

rattle.

The exhaust system center mounting at the muffler lo-

cation consists of an underbody bracket, an insulator and

CHEVROLET CHASSIS SERVICE MANUAL

FUEL TANK AND EXHAUST SYSTEMS 8-17

a clamp. The clamp holds the muffler and tail pipe with

a "U" bolt and at the same time secures the muffler and

pipe to the body.
The exhaust system mounting at the end of the tail pipe

secures the pipe to a bracket assembly and insulator at-

tached to an existing underbody bracket.

VIEW B

VIEW A

Fig.
20—Chevy II—Dual Exhaust Systems

COMPONENT PART REPLACEMENT

MUFFLER ASSEMBLY

Replacement (Service)

1.
Cut the exhaust pipe near the muffler to allow suf-

ficient pipe for muffler replacement:

CAUTION: Before cutting the exhaust pipe

measure service muffler exhaust pipe extension

and make certain to allow 1-1/2" for engagement

of exhaust pipe into muffler extension.

2.
Remove "U" bolt clamp at center mounting and dis-

engage muffler from tail pipe.

3.
Install new muffler and secure with new "U" bolt

clamps.

4.
Realign and check clearances before finally tighten-

ing all hardware.

NOTE:
If bracket mounting insulators (tire

carcass mountings) are fatigued, replace to in-

sure a secure exhaust system.

EXHAUST PIPE

Replacement

On V-8 engine exhaust models, if the left exhaust pipe
has to be replaced it will be necessary to replace both

the exhaust pipe and muffler with service replacement

parts.
The right exhaust crossover pipe may be replaced

without replacing the entire system as follows:

1.
Remove nuts attaching left and right exhaust pipes

to exhaust manifolds.

2.
Remove "U" bolt clamp retaining right exhaust pipe

to exhaust system and remove pipe.

3.
Using new manifold flange gaskets, install new ex-

haust pipe.

NOTE:
Check all clearances before tightening

hardware.

TAIL PIPE AND/OR RESONATOR

Replacement

1.
Install tail pipe to rear of muffler.

2.
Position tail pipe to obtain proper clearance to rear

spring bracket and underside of frame rail.

3.
Install tail pipe clamp over rear hanger and position

on pipe to maintain vertical position of insulator

without twist.

4.
Tighten nuts on "U" bolt clamp at rear of muffler,

then secure rear tail pipe damp.

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 8-25

4.
Cut the exhaust pipe near the muffler (see cau-

tion above) to allow sufficient pipe for muffler

replacement.

5.
^
Replace muffler and secure with new clamps.

NOTE:
Clamps must be assembled with nuts

attached toward the rear of the vehicle -

reference 90° to sawcuts in service muffler

pipe.

6. Reverse procedure for installation.

NOTE:
If bracket mounting insulators (tire

carcass mountings) are fatigued, replace to in-

sure a secure exhaust system.
7. In the event the tail pipe bezel has been damaged and

replacement is required, remove three screws and

replace the bezel. i

SIDE MOUNTED EXHAUST (Fig. 31)

Replacement

1.
Raise and support vehicle.

2.
Remove sill molding attaching screws and disengage

molding from the retainer.

3.
Remove cover retaining screws, cover and retainer

assembly.

4.
Remove exhaust pipe-to-manifold attaching nuts, and

rear bracket retaining nut, then detach exhaust pipe

from manifold studs and remove from vehicle.

Fig.
31—Side Mounted Exhaust System

CHEVROLET
CHASSIS SEKVK