248
XVIII. LPG FUEL SYSTEM PRESSURE RELIEF
The LPG fuel system operates at pressure
up to 21.5 bar (312 psi). To minimize per-
sonal injury, relieve the LPG fuel system
pressure before servicing the LPG fuel sys-
tem components.
1. Close the LPG fuel tank manual shut-off valve
(MSV).
2. Start and run the vehicle until the engine stalls
from lack of fuel.
3. Turn the ignition switch to OFF.
4. Disconnect the negative battery cable.
Residual vapor pressure will be present in
the fuel system. Ensure the work area is
well ventilated before disconnecting any
fuel line.
Never use an open flame of any type to
check for LPG leaks.
IMPORTANT
Always inspect the LPG fuel system for leaks after
performing service. Check for leaks at the fittings
of the serviced or replaced component. Use a
commercially available liquid leak detector or an
electronic leak detector. When using both me-
thods, use the electronic leak detector first to
avoid contamination by the liquid leak detector
XIX. CRANKCASE VENTILATION SYSTEM
INSPECTION/DIAGNOSIS
RESULTS OF INCORRECT PCV OPERATION
A plugged positive crankcase ventilation (PCV)
orifice or hose may cause the following conditions:
Rough or unstable idle
Stalling or low idle speed
Oil leaks
Oil in the air cleaner
Sludge in the engine
A leaking PCV orifice or hose may cause the fol-
lowing problems:
Rough Idle
Stalling
High idle speed
FUNCTIONAL CHECK
Any blow-by in excess of the system capacity,
from a badly worn engine, sustained heavy load,
etc., is exhausted into the air cleaner and is drawn
back into the engine.
Proper operation of the crankcase ventilation sys-
tem depends on a sealed engine. If irregular oil
flow or dilution is noted and the crankcase ventila-
tion system is functioning properly, check the
engine for another possible cause. Correct any of
these problems first.
If an engine is idling rough, inspect for a clogged
PCV orifice, a dirty vent filter, air cleaner element,
or plugged hose. Replace any faulty items found.
Use the following procedure:
1. Remove the PCV hose from the rocker arm
cover.
2. Operate the engine at idle.
3. Place your thumb over the end of the hose in
order to check for vacuum. If there is no va-
cuum at the hose end, inspect for plugged
hoses and/or clogged or damaged manifold
vacuum port.
4. Turn the engine OFF.
5. Inspect the PCV orifice in the valve cover for
debris or blockage. Clean with carburetor
cleaner as necessary.
XX. COOLANT HOSE
REMOVAL PROCEDURE
1. Stop engine.
2. Drain coolant.
To Next Page
Loading...