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FUEL SYSTEM
TESTING AND ADJUSTING
3.
If leakdown time for the first test is one minute or
more, the leakdown time is acceptable and no
additional leakdown tests are necessary.
4.
If leakdown time for the first test is less than one
minute, it will be necessary to make three
additional leakdown tests. Get an average of the
results of the three additional tests.
5.
If the average leakdown time of an injector is
less than the time given in the specifications
shown, do not use the injector.  A repair or
replacement of the injector must be made.
If there is to be a repair of the injector, see
REPAIR OF UNIT INJECTORS in Special Instruction,
Form No. SEHS8190.
FUEL PRESSURE
The 6V3150 Engine Pressure Group can be
used to check engine fuel pressures.
FUEL MANIFOLD AND LINES
6. Fuel supply line to cylinder head. 7, Fuel manifold.
The fuel pressure regulating valve keeps the
pressure in fuel manifolds (7) between 415 and 450 kPa
(60 to 65 psi).  To check the fuel manifold pressure,
disconnect one of the fuel lines (6) and install a tee
between the line and manifold.  Connect the 6V3150
Engine Pressure Group to the tee and operate the
engine.
6V3150 ENGINE PRESSURE GROUP
1. Differential pressure gauges. 2. Zero adjustment
screw. 3. Pressure gauge 0 to 1100 kPa (0 to 160 psi).
4. Pressure tap. 5. Pressure gauge 0 to 415 kPa (0 to
60 psi).
This tool group has a gauge to read pressure in
the fuel manifolds.
Special Instruction Form No.
SEHS7851 is with the tool group and gives information
for its use.
FUEL TRANSFER AND FILTER DIFFERENTIAL
PRESSURES
8. Fuel filter housing. Plug. 10. Plug.
The outlet pressure of the fuel transfer pump can
be checked at the location of plug (10) in filter housing
(8).
Also the fuel filter differential can be checked at
plugs (9) and (10) in filter housing (8).
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