Impco HHI, Service Manual

Page: 459 / 485

459
9. Start the vehicle and let run until it reaches
normal operating temperature.
10. If a DTC code is found, refer to the Electrical
Section for further diagnosis.
III. 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 valve on the LPG tank.
2. Start and run the vehicle until the engine stalls
running out of fuel.
3. Turn the ignition switch to OFF.
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
IV. FUEL TEMPERATURE (FT) SENSOR
REPLACEMENT (LPG ONLY)
Fuel Temperature Sensor
1. Relieve the LPG fuel system pressure. Refer to
III . LPG Fuel System Pressure Relief on page
459).
2. Disconnect the negative battery cable.
3. Locate the Fuel Temperature Sensor on the
EPR port.
4. Remove retaining clip holding the Fuel Temp
Sensor and remove the Sensor from the EPR
port.
5. Remove electrical connector.
6. Inspect the EPR for debris or “heavy ends” and
remove with a Safety Solvent if necessary.
Only use a Safety Solvent to clean any part
of the fuel system. Harsh cleaners such as
carb or brake cleaners may damage
gaskets, O-rings, seals and other non-
metallic components in the fuel system.
INSTALLATION
1. Lubricate O-rings on the sensor with petroleum
jelly or Vaseline.