Troubleshooting - Ford 4000 Series Shop Manual

Paragraphs 107-115
FORD
TROUBLE SHOOTING
(Model 4000 So Equipped)
107. A factory installed Century LP-
Gas fuel system is available on some
model 4000 tractors; refer to Fig. 106
for exploded view of the system. A Cen-
tury model STF filter-fuelock assembly
(13), model H converter (vaporizer-
regulator) (35) and model 3C-705-WD
carburetor (31) are used.
The model STF filter-fuelock is a so-
lenoid operated fuel shut-off device
which closes off the fuel supply to the
converter when ignition switch is in
"OFF" position. Turning the ignition
switch to "ON" position energizes the
solenoid and opens the fuelock.
The model H converter is equipped
with a solenoid coil operated plunger
which opens the secondary valve al-
lowing fuel to flow to the carburetor
AIR HORN PLUG,.
Fig. 104 -Measuring float set-
ting on Holley carburetor;
bend float tang If necessary
to correct float level.
Fig. 105-11 is very Important
that the air horn plug and
sintered bronze plug (44) are
properly Installed to prevent
dust entry Into engine air
intake . Drain plug Is (1).
LP-GAS FUEL SYSTEMS
when the solenoid is energized. A push
button switch located near the instru-
ment panel (primer button) energizes
the solenoid and is used instead of a
conventional choke valve within the
carburetor.
NOTE: Do not push primer button ex-
cept prior to starting engine , then depress
button only the one or two seconds re-
quired to fill vapor hose to carburetor with
fuel. Be sure throttle is open before oper-
ating primer button . The primer Is used for
starting purposes as the carburetor Is not
equipped with a conventional choke
mechanism.
The model 3C Carburetor is
equipped with idle speed, idle fuel mix-
ture and power fuel mixture adjust-
ments.
108. When malfunction of the LP-
Gas fuel system is encountered, refer to
the following paragraphs for possible
causes of trouble.
109. NO FUEL TO CAR-
BURETOR. First, check fuel tank to
be sure it is not empty, then close and
slowly open the fuel tank shut-off valve
to be sure the safety excess flow valve
is not closed. If gas does not flow after
shut-off valve is opened, loosen the fuel
line at converter inlet. If no fuel is pres-
ent, malfunctioning filter-fuelock is
indicated; refer to paragraph 118. If
fuel escapes, malfunctioning converter
is indicated; refer to paragraph 119.
110. FAULTY FILTER-FUELOCK.
Trouble may be caused by:
1. Fuel filter plugged.
2. Fuelock not opening; check for:
A. No electricity to coil.
B. Defective coil.
111. FAULTY CONVERTER.
Trouble may be caused by:
1. Primary regulator not working
because of:
A. Primary orifice plugged from
excessive amount of thread
sealer used on assembly.
B. Primary regulator assembled
without spring.
2. Secondary regulator not working
because of.
4. Valve seat stuck to orifice.
B. Lever far out of adjustment.
C. Primer plunger too short to
open valve.
D. Inoperative primer due to defec-
tive push button switch, defec-
tive coil or incorrect wiring.
112. FUEL LEAKING THROUGH
CONVERTER. Check the primary
regulator pressure. If normal, leakage
is through secondary regulator. If pri-
mary regulator pressure is excessive,
leakage is due to primary regulator.
Overhaul of converter is given in para-
graph 119.
113. FAULTY PRIMARY REGU-
LATOR. Trouble may be caused by:
1. Valve seat dirty or defective.
2. Diaphragm broken.
3. Valve lever distorted.
4. Spring or washers incorrectly in-
stalled.
114. FAULTY SECONDARY REG-
ULATOR, If primary pressure is nor-
mal, leakage through secondary regu-
lator could be caused by:
1. Dirt on valve seat.
2. Spring missing.
3. Lever incorrectly adjusted.
4. Primer plunger too long.
5. Primer actuated at all times.
115. CONVERTER FREEZING.
Note: Repeated converter freezing can
loosen back screws or distort back
40