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FUEL SYSTEM
TESTING AND ADJUSTING
FUEL SYSTEM
Either too much fuel or not enough fuel for com-
FUEL INJECTOR TESTING
bustion can be the cause of a problem in the fuel system.
Tools Needed:
Many times work is done on the fuel system when the
6V4022 Injector Tester.
problem is really with some other part of the engine. The
6V4172 Injector Sleeve.
source of the problem is difficult to find, especially when
6V6068 Calibration Fluid 19 liters (5 U.S. gal.)
smoke comes from the exhaust.  Smoke that comes
-or-
from the exhaust can be caused by a bad fuel injector,
6V6067 Calibration Fluid 208 liters (55 U.S.
but it can also be caused by one or more of the reasons
gal.)
that follow:
NOTICE
a.
Not enough air for good combustion.
Be sure to use clean SAE J967 Calibration Fluid
b.
An overload at high altitude.
when tests are made. Dirty test fluid will damage
c.
Oil leakage into combustion chamber.
components of the fuel injectors. The temperature
d.
Not enough compression.
O
O
of the test fluid must be 18 to 24 C (65 to 75 F) for
good test results.
FUEL SYSTEM INSPECTION
A problem with the components that send fuel to
the engine can cause low fuel pressure.  This can
decrease engine performance.
1. Check the fuel level in the fuel tank. Look at the cap
for the fuel tank to make sure the vent is not filled with
dirt.
2. Check the fuel lines for fuel leakage. Be sure the fuel
supply line does not have a restriction or a bad bend.
3. Install new fuel filters. Clean the primary fuel filter.
4. Inspect the fuel pressure relief valve in the fuel
transfer pump to see that there is no restriction to good
operation.
6V4022 INJECTOR TESTER
CHECKING ENGINE CYLINDERS
1. Sight tube. 2 Test pressure gauge. 3. Load cell
SEPARATELY
pressure gauge. 4. Handle (to pump test fluid). 5.
Temperature of an exhaust manifold port, when
Injector holding block. 6. Spray shield. 7. Drain
the engine runs at low idle speed, can be an indication of
panel. 8. Base (reservoir).
the condition of a fuel injector. Low temperature at an
exhaust manifold port is an indication of no fuel to the
cylinder. This can possibly be an indication of an injector
When fuel injectors are tested, be sure to wear eye
with a defect.  Extra high temperature at an exhaust
protection. Test fluid comes from the orifices in the
manifold port can be an indication of too much fuel to the
injector tip with high pressure. The test fluid can
cylinder, also caused by an injector with a defect.
pierce (go thru) the skin and cause serious injury to
the operator. Also, the 6V4022 Injector Tester must
be used in an area that is well ventilated (good
movement of air).
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