Cadillac 60 Series 1963 Shop Manual page 242

FUEL A N D EXHAUST
10-7
requirements by approximately one octane number
for each 2,000 feet. For this reason, the ap-
propriate spark setting for a particular locality
should be determined on the basis of the lowest
altitude where the customer may drive with lo-
cally available fuels.
Do not "power time" the engine, as variations
in weather conditions will affect the day-to-day
octane requirements. Never advance the spark
beyond 5° B.T.D.C.
10. Storage Precautions
Whenever a car is to be put in storage for any
length of time, all gasoline should be drained
from the entire fuel system, including the carbu-
retor, fuel filter, fuel pump, lines and tank. This
must be done to assure freedom from gum de-
posits that would occur by evaporation of the fuel.
11. Fuel Tank Removal
and Installation
NOTE: When working on or around the fuel
tank, always have a CO
2
fire extinguisher near
the work area. In addition, do not permit any
smoking, open fire, or work of a nature that
could produce a spark in the area.
a. Removal
1. Disconnect fuel gage tank wire at connector
at right of filler cap behind license plate mount.
This is the lower connector and is a brown wire.
Pull wire down from underside of car past rear
frame member.
2. Raise rear end of car.
3. Drain fuel from tank.
4. Loosen clamp at lower end of filler pipe
flexible hose connector.
5. Remove bolt from support bracket of filler
pipe and remove filler pipe through opening be-
tween bumper and rear end of frame.
6. Disconnect fuel outlet hose at front of tank.
7. If car is equipped with Air Conditioner, dis-
connect vapor return hose.
8. Disconnect overflow vent pipe at front of
tank.
9. Disconnect fuel gage tank unit ground wire
at rear frame cross member.
10. Remove tank support strap nuts and remove
tank.
b. Installation
1. Raise tank into position and install tank
support strap nuts. Make sure fuel gage tank
unit wire hangs over edge of tank.
NOTE: Do not tighten tank strap nuts until
filler pipe is installed.
2. Position filler pipe in plate and tighten clamp
on end of hose connector.
3. Install bolt in support bracket at top of pipe.
4. Tighten tank strap nuts until 3/4 inch to
13/16 inch of thread is exposed on bottom of J-
bolts. On 75 series cars run nut below notch and
break off notched end of J-bolt. Be careful not to
overtighten tank strap nuts.
5. Connect fuel outlet hose.
6. If car is equipped with Air Conditioner, con-
nect vapor return pipe.
7. Connect overflow vent line.
8. Route tank wire (brown) over rear cross
member up to right of filler pipe and secure to
lower right: connector.
9. Connect tank unit ground wire to frame.
10. Lower car, add gasoline to tank and check
for leaks at filler pipe, vent pipe, fuel line, and
vapor return line.
11. Check operation of fuel gage.
12. Fuel Line and Tank Cleaning
Occasionally it may be necessary to clean out
fuel line and tank to remove foreign particles
from system. Frequent replacement of fuel filters
and excessive deposits of dirt in filter bowl are
indications that this may be necessary.
To clean out fuel line, disconnect line at fuel
pump and at fuel tank, blow compressed air
through line in reverse direction to fuel flow,
and reconnect line.
For cleaning, fuel tank must be removed from
car, as described in Note 1.1a, and flushed out
to remove all foreign materials. Fuel strainer
should also be inspected and replaced if
necessary.
13. Fuel Line Removal and
Installation
NOTE: When working on or around the fuel
lines, always have a CO2 fire extinguisher near