Proheat X45–School Bus - Manual (Page 64)

SECTION 5. TROUBLESHOOTING & REPAIR 5-7
Fuel System – Step 2
Check: Regulator
a) For damage, contamination and mechanical operation.
Test Procedure — Vent Hole Regulator Style:
a) Disconnect the fuel line at the nozzle fuel inlet fitting and place
in a container.
b) Inspect vent hole to ensure that it is not plugged.
c) Start the heater. No fuel should be exiting the outlet of the
regulator.
If fuel is leaking from the outlet, replace fuel regulator.
Test Procedure — Capped Style:
a) Remove fuel line that goes from the outlet of the regulator to
the nozzle.
b) Start the heater. No fuel should be exiting the outlet of the
regulator.
If fuel is leaking from the outlet, replace the fuel regulator.
c) Install clear plastic hose that replaces the hose removed.
d) Start the heater. Fuel should start to flow out of the regulator
and up to the nozzle.
If the regulator does not operate as described in d), replace the
regulator.
PLACE THIS LINE IN A
CONTAINER OF FUEL
MAINTAIN FUEL LEVEL
AT CENTRE OF THE
REGULATOR
REMOVE FUEL LINE
FROM REGULATOR
Figure 5-4 Eliminating Fuel Pump and Regulator from system.