Chapter 3 Fuel Injection Equipment
6. Fuel Feed Pump
4LHA Seriesy
6-5
Fuel
Feed
Pump Adjustment
1. Testing procedures for the fuel feed pump
Set
the fuel feed pump on the injection pump, and
operate the assembled
unit
on the pump tester.
(2) Max. delivery feed volume test
You
will
need the
special
equipment for conduct-
ing max. delivery pressure and delivery volume
tests.
Fuel
piping should be provided directly
from
the tank,
not through the delivery pump of the tester.
(1) Suction test for the priming pump
Loosen
the handle of the priming pump, and push
the handle at 60 — 100 strokes/minute. If fuel
comes
out of the delivery side of the feed pump
after about 30 strokes, the priming pump is normal.
If it takes longer, replace the priming pump as a
set.
Max.
delivery pressure test
NOTE: 1. Do not run the equipment for more than
5 minutes since the fuel injection pump
may be damaged if operated in non-
injection condition.
2. Operate the injection pump at the speci-
fied rpm, and read the pressure gauge
indicator when valve B is tightened
completely. Tighten valve A so that the
pressure gauge indicator does not move
when the pressure is applied.
Suction
head
Suction
pipe dia.
1 m
Within 30 strokes
>
Volume pressure[MPa(kgf/cm')]:0.216-0.314(2.2-3.2)
• rpm:600
Replace
the piston spring if it is defective.
(3) Delivery test
Operate
the fuel injection pump at the specified
rpm,
open valve (B)
until
the pressure gauge
indicator shows
0.098(1
)MPa(kgf/cm), and
measure
the delivery rate for one minute.
• Volume (t /min.): over 1.8
•
Back
pressure (MPa(kgf/cm')] :0.098(1)
»rpm:
1000
O
Pressure
gauge
0 - 0.98(10)MPa(kgf/cin)
Valve
(B)
Valve
(A).
Feed
pump
Equipment for feed pump test
Delivery
test
3-2-42
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