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
ACCESSORIES 15-11
12 VOLTS D.C.
ELECTRIC BRAKE
RELEASE
IGNITION
SWITCH
ENGINE
VACUUM
TRANSDUCER
Fig.
11 - Vacuum and Electrical Diagram
AUTOMATIC LEVEL CONTROL
INDEX
Page
General Description . . 15-11
System Checks and Adjustments 15-13
Service Operation . 15-15
GENERAL DESCRIPTION
A pneumatic level control system that automatically
maintains correct rear trim height of a car under varying
load conditions, the optional automatic level control is
used only in conjunction with the Superlift Shock Absorber
option.
The Superlift Shock Absorber option alone, consists of
the two shock absorbers with pressure lines to a "Tee"
where a ill valve is located, the shocks are inflated
with (or deflated of) compressed air (at any gas station)
to obtain the vehicle level desired with any given load
change.
The automatic leveling system is added to the Superlift
Shock Absorbers and supplies its own compressed air.
The system (fig. 13) consists of a vacuum operated air
compressor with pressure regulator,
and
integral storage
tank, vacuum line to engine, air intake filter, air lines,
and a height control valve.
The COMPRESSOR is a two-stage, vacuum actuated
type, requiring no lubrication. Vacuum supply is taken
from engine carburetor base. High pressure air is
supplied to the reservoir tank by the second stage of
the two-stage compressor. The first stage intake stroke
draws air at atmospheric pressure through a oneway
check valve located in the end of the first stage housing
under the first ^tagei housing cover. On the first stage
compression stroke, the intake valve is closed and the
oneway check valve in the second stage end of the piston
is opened. This allows the air from the first stage
cylinder to flow through the hollow piston into the second
stage cylinder for jhigh pressure compression. The
second stage compression stroke closes the check valve
in the piston and opeijis the check valve in the end of the
second stage housing.
The intake and compression strokes are controlled by a
sliding distributor valive that is actuated through an arm
that is tripped by the piston as it nears the end of each
stroke. Each time the arm actuates the distributor
valve, a different set of holes are covered in the first
stage housing. The distributor valve controls the flow of
intake manifold vacuum and air under atmospheric pres-
CHEVROLET CHASSIS SERVICE MANUAL
