COVER
ROCKERARM
SPRING
SEDIMENT
BOWL
FIGURE
28.
FUEL SYSTEM-LATEST MODELS
AIR
FUEL
TRANSFE
f
SECONDARY
TANK
-
FUEL
FILTER
FIGURE
29.
FUEL SYSTEM-OLDER MODELS
m
FUEL TRANSFER
PUMP
The fuel transfer pump (Figure
30)
is a diaphragm
and check valve type pump operated by a cam lobe
on the engine camshaft. The pump cam follower has
a
wide surface to prevent wear as
it
rides on the
camshaft lobe. The priming lever is manually oper-
ated to prime and bleed
the
system.
The diaphragm spring maintains required fuel pres-
sure to the injection pump. Fuel pressure should be
as follows when operating at 1800 rpm:
MDJA
.............................
.5
to
6
psi
(34.5
to 41.4 kPa)
(83
to
97
kPa)
MDJC, MDJF
....................
.12 to 14 psi
(83
to
97
kPa)
.
MDJB, MDJE
....................
.12 to
14
psi
**
*
**
Prior to 1962
and
October through
December
1964
-
2
to3
psi
(14
to
21
kPa).
Prior
to
1962
-
2 to
3
psi
(14
to
21
kPa).
ROCKER
ARM
ROCKER
ARM
PRIMING^
LINK
A687
FIGURE
30.
FUEL
TRANSFER
PUMP
Fuel pump pressure may bechecked by connecting a
pressure gauge and tee at the fuel outlet.
A
vacuum
gauge connected at the fuel inlet will show whether
the pump has enough capacity to
lift
fuel about6feet
(1.86 m). The fuel pump should produce
15
to 18
inches (381 to 457 mm) of vacuum at sea level.
Fuel Pump Removal Disassembly
1.
Remove pump inlet and outlet lines. Remove
two
capscrews holding pump to engine and
lift
it
off.
2.
Notch the pump cover and body with afileso they
can be reassembled
in
same relative positions,
and remove six screws holding them together.
3.
Tap body with a screwdriver to separate
two
parts. Do not pry them apart; this would damage
diaphragm.
4.
Drive out rocker arm hinge pin.
5.
Remove rocker arm, spring, and link.
6.
Lift
out diaphragm assembly and diaphragm
Repair
A
kit is available for replacement
of
the diaphragm
and spring. If the diaphragm is leaking or broken,
check for diluted crankcase
oil.
If necessary, replace
diaphragm. Occasionally, a worn rocker arm pin will
cause crankcase oil leakage. If this is the case, the
pump should be replaced.
spring.
37
Redistribution or publication of this document,
by any means, is strictly prohibited.
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