DSG-423 FUEL SYSTEM
04-29
Diagnostic Aids
Fuel Lock Solenoid
:The fuel lock is an electronic
solenoid that is opened to allow fuel flow when the key
is turned ON. High temperatures may cause the
solenoid to become intermittent, not opening to supply
sufficient fuel pressure.
Fuel Filter
:There is a filter element located in the inlet of
the fuel lock which may become clogged and limit fuel
flow, especially at low tank pressures. Check the filter
and replace as necessary.
Fuel Line Restrictions
:The vehicle specifications table
specifies the fuel line to be a certain size. If the fuel line
from the tank to the fuel lock is not the proper size, or
any valves or fittings with flow restrictive characteristics
are used, the fuel flow will not be sufficient to the
converter with low tank pressure. Correct any fuel line
or fitting restrictions.
Mixer Assembly (Carburetor
):It is possible that a
backfire may have caused the fuel valve to partially
come off of it's retainer and restrict fuel, check the mixer
fuel valves, see section 475-1 for disassembly. Also
check the mixer adapter plates for leakage past the
carburetor.
Regulator Assembly (Converter & FCV
): If no other
problems have been identified, replace the fuel
management assembly with a known good part of the
same pressure range. Retest.
6 Check air valve operation. Yes
No
Refer to section 475-1 for servicing the
carburetor.
Service the carburetor (see section
475-1) and retest. Refer to the
Diagnostic Aids below.
• Using the WTK-1 test kit, connect the vacuum gauge
between the carburetor and the FCV valve to measure the
carburetor air valve vacuum (AVV).
• With the engine at idle and accelerating observe the
amount of measured vacuum.
Is the measured vacuum non-linear and outside the
specifications?
Engine Stops Running - Dies (Continued)
Test Step Result Action to Take
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