Proheat M125 - Manual (Page 54)

4-17 PROHEAT M-SERIES G-II PCM SERVICE MANUAL
Fuel Supply Pump – Check:
a) Fuel Supply Pump pressure and operation.
Test Procedure – Fuel Supply Pump pressure:
a) Disconnect all harnesses at the G-II PCM.
b) Disconnect the fuel supply line.
c) Loosen and back out the burner head mounting (2) bolts five to six turns
allowing enough room to rotate the burner head 15° counter-clockwise
and remove.
d) Remove ignition electrode assembly. Use a flat head screwdriver to pry
the electrode assembly out.
e) Remove the flame shield. Rotate to match the mounting square.
f) Disconnect the Fuel Solenoid Valve and Ignition Module connectors at the
G-II PCM. Ensures that fuel will not spray and/or light during testing.
g) Remove the Fuel Supply Pump test port plug located behind the Fuel
Solenoid Valve and install test gauge PK0067.
h) Reconnect the power and switch harnesses at the G-II PCM.
i) Reconnect the fuel supply line.
j) Switch the PROHEAT on and read the fuel pressure (should be 5 – 10 PSI):
If the pressure is out of range, Go to Fuel Supply Pump cleaning, page 4-18.
If the pressure reads OK, review Fuel System troubleshooting, page 4-5.
START: Fuel System Step 7
(1 Flash)
Figure 4-19: Burner Head Removal and Fuel Pressure Test.
GAUGE (P/N PK0067)
FUEL SUPPLY PUMP TEST PORT
FUEL
SOLENOID
VALVE
FLAME
SHIELD
FUEL TEST PORT
IGNITION
ELECTRODE
ASSEMBLY
WARNING
Spilt fuel is flammable.
WARNING
To avoid the risk of shock and to
ensure that the PROHEAT does not
fire, disconnect the Ignition Module
connector at the G-II PCM.
NOTICE
Leaving the Dual Mode Temperature
Sensor disconnected ensures that
the burner head will enter Cool Down
(Purge) mode and run for a maximum
of three minutes.
MOUNTING EARS (2)
MOUNTING BOLTS (2)
TORQUE = SEE SECTION 1.3
COOLANT PUMP
SWITCH INPUT
DUAL MODE TEMP
SENSOR
POWER
FUEL INLET
NOTICE
All plugs/harnesses must be rein-
stalled into the G-II Proheat Control
Module (G-II PCM) before heater
goes back into service.