Fuel
Pump
Repair
(for
units
built
June
1986
and
bef0re):Service
of
the fuel pump is limited
to
the bottom
cover, plunger tube, and plunger assembly.
All
parts of
the
electric
system
are
hermetically
sealed
in
a
gas
atmosphere
and
are
not
serviceable.
If
electrical
failure
occurs, replace the pump.
JACAUTIONI
Do
not
tamper
with
the
seal
at
the
center
of
the
mounting bracket on
fhe side
of
fhe pump as if refains the dry gas which
surrounds
the elecfricai system. Electrical sysfem
components are not serviceable.
Use the following procedure for servicing the pump:
1. Using a gas pliers, loosen the pump cover, then
remove by hand.
Remove the magnet and cover gasket (Figure
6-22).
PUMP
ASSEMBLY
I
FS-1487
FIGURE 6-22. FUEL PUMP ASSEMBLY
(June
1986
and
before)
Using a thin nose pliers, remove the retainer
spring from the plunger tube. Remove the
washer,
“0”
ring seal, cup valve, plunger spring
and plunger from tube (Figure
6-23).
Wash all parts (except gasket and seal) in parts
cleaning solvent. Blow out solvent and dirt with
low pressure compressed air. Slosh the pump
assembly in cleaning solvent, blow dry and swab
the inside of the plunger tube with a cloth
wrapped around a stick. If the plunger does not
wash clean or has rough spots, gently clean the
surface with crocus cloth.
-1
Most
parts
cleaning solvents
are flammable and can cause
severe personal injury
if
used improperly. Follow
the manufaciurers recommendations when cleaning
parts.
5.
Insert plunger in tube, buffer spring end first.
Check fit by slowly sliding the plunger back and
forth in the tube. It should move fully without any
tendency to stick. If a click cannot be heard as the
plunger
is
slid from one end to the other, the
internal pump assembly is not functioning prop-
erly and the pump should be replaced.
.-
-
6.
7.
Install plunger spring, cup valve,
“0”
ring seal
and washer. Compress the spring and install the
retainer with ends in the side holes
of
the tube.
Check cover gasket and replace if deteriorated.
Place cover gasket in the bottom cover and install
cover assembly on pump. Twist cover on by hand
and tighten securely with a 5/8-inch wrench,
PUMP
ASSEMBLY
PLUNGER
RETURN
SPRING
Fs-1486
FIGURE
6-23.
PLUNGER ASSEMBLY
Pump
Test
(for
units
built June
7986andaifer):Test the
fuel pump by checking the pump outlet pressure. Use
the following procedure.
1.
Removethefuel line from the pump outlet and install
a pressure gauge.
2.
Press the START switch and hold it for several
seconds until pressure reading
is
constant.
3.
The pressure reading for a good pump should fall
within
3-1
/2
to
5
psi
(1
7.2
to
34.4
kPa). The pressure
shouid stay constant or drop
off
very slowly.
If
pressure reading is below
3-1
12
psi
(17.2
kPa),
replace fuel pump.
If
pressure reading is at zero, stop engine crank-
ing and check electrical connections. Press the
START switch and recheck pressure reading.
There are no serviceable components in the
fuel pump. Replace if defective.
FUEL SYSTEM
-
LP-GAS
The fuel system must be in good condition and prop-
erly maintained for eff icient generator set operation.
The main components of the fuel system are the air
cleaner assembly, carburetor, intake manifold, fuel
filter, solenoid valve, vaporizer, and two-stage regula-
tor.
All
LP-gas generator sets utilize a liquid withdraw-
al system and are intended
to
share the vehicle LP-
gas fuel supply tanks. The LP-gas fuel supply tank
must be designed with a dip tube to permit liquid fuel
withdrawal. The following sections provide basic
information about LP-gas fuel systems and specific
service procedures for each fuel system component.
‘6-1
9
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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