150
ernor
linkage/or
easier
pump
removal
and
installation.
6.
Lift
the injection pump out
of
the engine while care-
fully disengaging the governor linkage from the pump.
7. Remove the timing shims (Figure 34) and set them
aside for reinstallation.
8. To reinstall the injection pump, reverse the removal
procedure. Make sure to reinstall the timing shims and en-
gage the control rack pin (Fig
ure
35) with the governor
lever fork. Tighten the
pump
retaining nuts to 25 Nom(18
ft.-lb.). Bleed the fuel injection system as previously de-
scribed. Run the engine and check for leaks.
FUE
L
TRA!\
'SFE
R
PUMP
The engine is equipped with a fuel transfer pump (A,
Figure 36) to move fuel from the fuel tank to the fuel filter
and fuel injection pump. A cam lobe on the engine cam-
shaft operates the pump lever
(Fig
ure
37), which moves
the fuel pump diaphragm to pump the fuel. Fuel pump
pressure is approximately 9.7 kPa (1.4 psi).
The transfer pump output port on lGM and IGM IOen-
gines is on the left side with the pump mounted on the en-
gme. On all other engines, the output port is on the right
side.
Fuel
Pump
Testing
WARNING
Always
have a fire extinguisher, rated
for
file!
and
electricalfires, on
hand
when ser-
vicing any
part
ofthefue!
system. Clean up
any spilled
fuel
as soon as possible.
I. Loosen the air bleed screw (Fig
ure
38) on the fuel fil-
ter.
C
HAPTER
SEVEN
2. Operate the engine starter. If the fuel transfer pump is
operating properly, fuel will flow from the air bleed screw
hole.
3. If fuel does not flow from the air bleed screw hole, dis-
connect the output fuel line
(B, Fi
gur
e 36) from the fuel
pump.
NOTE
Be prepared to catch
fuel
expelledfro
m the
pump.
4. Operate the engine starter.
If
fuel docs not flow from
the fuel pump, replace the pump.
Removal
and
Installation
I. Close the fuel tank valve.
NOTE
Accountfor
the sealing washers on
thefue!
hose ends.
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