Proheat M80 - Manual (Page 35)

PROHEAT G-I PCM SERVICE MANUAL 4-4
Fuel and fuel supply – Check:
a) Vehicle fuel level and/or for fuel gelling during cold weather.
b) Air leaks and/or restrictions in the fuel supply lines to the PROHEAT.
c) The PROHEAT operation when supplying fuel from a direct source.
Test Procedure – Supplying fuel from a remote source:
a) Remove the fuel supply line from the PROHEAT fuel inlet.
b) Using a length of fuel line connected from the PROHEAT fuel inlet to a
direct source of CLEAN fuel. Switch the PROHEAT on and operate for at
least one complete cycle. Observe the operation.
If the PROHEAT functions correctly, the fault is in the vehicle fuel system.
Check fuel lines, connections and routing back to fuel tank. Consult OEM
for service requirements.
If a Start diagnostic code is indicated, the problem is in the PROHEAT
fuel system. Proceed to Step 2.
START: Fuel System Step 1
(1 Flash)
Figure 4-2: Remote Fuel Supply
FUEL
CONTAINER
FUEL INLET
NOTICE
When fuel system is open, the
PROHEAT will smoke and stumble
until the air is purged from the
system. It may be required to cycle
more than one time.
NOTICE
All plugs/harnesses must be rein-
stalled into the Proheat Control
Module (G-I PCM) before heater goes
back into service.
WARNING
Flammable liquid and vapours.