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14-76
FUEL SYSTEM-FUEL
TANK
Pressure Test
(1) Insert a "T" fitting in the fuel line at the car-
buretor, as shown in (Fig.
4).
(2) Connect
a
6 inch piece of hose between the "T"
fitting and gauge Tool C-3411. (The hose should not
exceed 6 inches. A longer hose may collect fuel and
the additional weight of the fuel would be added to
the pressure of the pump and result
in
an inaccurate
reading).
(3) Vent the pump for a few seconds (this relieves
the air trapped in the fuel chamber). If this is not
done, the pump will not operate at full capacity and
a low pressure reading will result.
(4)
Connect a tachometer, then start the engine
and
run
at 500 rpm. The reading should be from 3%
to
5
psi
(or
from 5 to
7
psi, depending on pump) and
remain constant or return to zero, very, very slowly
when the engine is stopped. An instant drop to zero
indicates a leaky outlet valve. If the pressure is too
low a weak diaphragm main spring, or improper as-
sembly of the diaphragm may be the cause. If the
pressure is too high, the main spring is too strong.
Vacuum Test
The vacuum test should be made with the fuel line
disconnected from the carburetor. (This will allow the
pump to operate at full capacity, which it must do to
prime a dry carburetor). The vacuum reading should
be at least 10 inches of vacuum at 500 r.p.m. with the
fuel line disconnected at the carburetor.
Volume Test
The fuel pump should supply 1 quart of fuel in 1
1 1
I
(ENGINE SPEED)
FU
k f P J h
K R Y S
Fig. 4-Pressure
Testing the Fuel Pump
minute or less at 500 rpm.
Inlet Valve Test
To test the inlet valve, connect a vacuum gauge
on
the inlet fitting while the line is disconnected:
(1) Start the engine or crank over with starting mo-
tor. There should be a noticeable vacuum present, not
alternated by blowback.
(2) If blowback is present, the inlet valve i s not
seating properly and a
new
pump should be installed.
If the fuel pump does not perform to the above
test
requirements, the fuel pump should be removed from
the vehicle.
FUEL TANK
Description
The fuel tank on both the conventional and the
Station Wagon Models (106" wheelbase) is located at
the rear of the body, under the trunk compartment
floor, as shown in (Figs. 1 or 2 ) . The filler tube is
located in the left rear quarter panel.
The fuel tank on all models (116" wheelbase) ex-
cept the Station Wagon Models, is located at the rear
of the body under the trunk compartment floor, as
shown in (Figs. 3 and
4).
In the Station Wagon Mod-
els the fuel tank is mounted in the left rear quarter
panel beyond the wheel house, as shown in (Fig. 5 ) .
The filler tube on the conventional models is ac-
cessible through the center of the deck opening lower
panel. Station Wagon models fill at the left rear up-
per quarter panel between the quarter post and the
fin.
NOTE:
If a vehicle is to stored for any appreciable
length of time, the gasoline should
be
drained from
the entire system in order to prevent gum forma-
tion. If the vehicle has
been
undercoated,
be
sure
the tank vent tube i s open. If this vent is plugged,
a collapsed fuel tank will result.
The fuel tank on all 106" wheelbase models has a
18 gallon capacity, The fuel tank on all conventional
116"-119.5" W/B Models has a 19 gallon capacity.
(The Station Wagon tank capacity is 21 gallons). The
fuel tank is fitted with a gauge unit, including the
suction pipe, as shown in (Fig. 6 ) . The filter on the
end of the suction pipe is a replaceable unit and pre-
vents the entry of water or foreign material. When
installing a tank unit, be sure the filter is pushed
down on the pipe until seated.
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