Ford FALCON XA Series Repair Manual page 411

10-2
PART
10·1
GENERAL FUEL SYSTEM SERVICE
Section Page
Section Page
1
D~agnos~s
and Testing ...... ...... ...... ...... ...... . .... .10-2
Diagnosis ...... ...... ...... ...... ...... ...... ...... ...... ...... . .... .10-2
2 Common Adjustments and Repairs ............ 10-7
Throttle Linkage Adjustments ....................... .10-7
Fuel Tank and Lines Diagnosis Guide ...... ..... .10-3 Accelerator Pedal Idle Height Adjustment ...... 10-7
Carburettor Diagnosis Guide ............................. .10-3 Throttle Linkage Repair ...... ...... ...... ...... ...... . .... .1 0- 7
Tests ................. , ..................................................... .10-5 3 Cleaning and Inspection .............................. ............ 10-13
Fuel Pump Tests ........................ ............................. .10-5 Carburettors ........................................................... .10-13
Carburettor Tests ........................ ...... ................. .10-6 Fuel Pump .................. ........................ ................. .I0-13
This part covers general fuel sys-
tem diagnosis, tests, adjustment and
repair procedures. In addition, clean-
ing and inspection procedures are
covered.
For fuel system component re-
moval, disassembly, assembly, instal-
lation, repair procedures, adjust-
ments and specifications, refer to the
pertinent part of this group.
The carburettor identification is
stamped on the carburettor upper
body or float bowl for Stromberg
Air Cleaner ...... ...... ...... ...... ...... ...... ...... ...... ...... . .... .1 0-13
carburettors and on a tag attached to
the upper body on Motorcraft car-
burettors. To procure replacement
parts, it is necessary to know the
part number prefix and suffix and,
in some instances, the design change
code
Always refer to the Master Parts
Catalogue for parts usage and inter-
changeability before replacing a car-
burettor or a component part for a
carburettor.
D
DIAGNOSIS AND TESTING
DIAGNOSIS
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
fuel pump, or carburettor. Conden-
sation, 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.
If the accumulation of sediment
in the filter is excessive, the fuel
tank should be removed and flushed,
and the line from the fuel pump to
the tank should be blown out.
Leakage in the fuel inlet line can
cause low vacuum, and volume con-
ditions, and loss of fuel.
A restricted fuel tank vent can
cause low fuel pump pressure and
volume and may, in some instances,
result in collapsed inlet hoses or a
collapsed fuel tank.
FUEL PUMP
Incorrect fuel pump pressure and
low volume (ftow rate) are the two
most likely fuel pump troubles that
will affect engine performance. Low
pressure will cause a lean mixture
and fuel starvation at high speeds
and excessive pressure will cause
high fuel consumption and carburett-
or flooding. Low volume will cause
fuel starvation at high speeds.