General Fuel System Service; Fuel Tank, Lines And Filter; Vapor Discharge Valve And Fuel Pump; Vapor Discharge Valve - Lincoln Continental 1964 Shop Manual

PART
10-1
GENERAL FUEL SYSTEM SERVICE
PART
10-2
PAGE
.. 10-1
10-1
GROUP
10
PART
10-4
PAGE
FUEL PUMP AND VAPOR DISCHARGE
VALVE . . . . . . . . . . . . . . . . . . . . 10-27
PART 10-5
FUEL TANK AND LINES . . . . . . . . . . 1 0-31
CARTER CARBURETOR . . . . . . . . . . .
I
0-11
PART
10·3
PART
10-6
AIR CLEANER AND AIR DUCT ..... 1 0-25
SPECIFICATIONS . . . . . . . . . . . . . . . 1 0-34
PART
10-1
GENERAL FUEL SYSTEM SERVICE
Section Page Section Page
1 Diagnosis and Testing . . . . . . . . . . ......... 10-1 3 Cleaning and Inspection .................. 10-9
2 Common Adjustments and Repair-; .......... 10-5
II
DIAGNOSIS AND TESTING
FUEL TANK, LINES AND FILTER
Water and dirt that accumulate
in the fuel tank can cause a restricted
fuel line or filter and malfunction
of the vapor discharge valve, fuel
pump, or carburetor. Condensation,
which is the greatest source of water
entering the fuel tank, is formed by
moisture in the air when it strikes
the cold interior walls of the fuel
tank.
Leakage in the fuel inlet line can
cause low vacuum, pressure and vol-
ume conditions, and loss of fueL
A restricted fuel tank vent, located
in the filler cap, can cause low fuel
pump pressure and volume which
may, in some instances, result in
collapsed inlet line hoses or a col-
lapsed fuel tank.
VAPOR DISCHARGE VALVE
AND FUEL PUMP
Fuel pump static pressure and
flow capacity specifications for the
fuel pump take into consideration
the effect of the thermostatic vapor
discharge valve on these functions;
therefore, all checks of static pres-
sure and flow capacity must be taken
with the thermostatic valve in the
closed (cold) position to prevent
condemnation of a good pump.
VAPOR DISCHARGE VALVE
Test. To check whether the valve
is open or closed, operate the engine,
and disconnect the vapor return line
at the fuel pump adapter connection.
Guard against any fuel spillage by
using a container to collect any
fuel that is discharged during the
check (Fig. 1).
If only a small amount of fuel is
being discharged at the adapter ori-
fice, the valve is closed. The dis-
charged fuel (approximately four
ounces in 100 seconds) is passing
through the pressure leak-down
FIG.
1-Vapor
Discharge Valve Test
bleed and can be disregarded when
making the test.
If a considerable amount of fuel
is being discharged, the valve is
open. This condition may be due
to the high temperature of the fuel
within the pump or to the valve
stem sticking in the open position.
In either instance, steps must be
taken to close the valve, either by
cooling the fuel pump or, if the
valve is stuck open, cleaning or re-
placing the valve assembly.
If it is desired, a suitable cap or
plug may be placed in the vapor dis-
charge outlet while performing the
fuel pump tests. If a cap or plug is
not used, connect the vapor return
line to the adapter.
FUEL PUMP
Incorrect fuel pump pressure and
low volume (flow rate) are the two
most likely fuel pump troubles that
will affect engine performance. Low
pressure will cause a lean mixture at
high speeds and excessive pressure
will cause high fuel consumption and
carburetor flooding. Low volume will
cause fuel starvation at high speeds.
Two tests: fuel pump static pres-
sure and fuel volume are necessary
to determine that the fuel pump is
I