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LPG FUEL SYSTEM DIAGNOSIS
Regulator Assembly
FUEL SYSTEM DESCRIPTION
The Engine Control Module (ECM) receives
information from various engine sensors in
order to control the operation of the engine.
LPG is stored in the tank as a liquid and deli-
vered under pressure up to 21.5 BAR (312
psi). At Key ON the Regulator allows LPG to
flow from the tank through the fuel filter and
inside, where fuel is vaporized and reduced in
pressure.
DIAGNOSTIC AIDS
This procedure is intended to diagnose a ve-
hicle operating on LPG. If the vehicle will not
continue to run refer to Hard Start for prelimi-
nary checks. Before starting this procedure,
complete the following tasks to verify that liq-
uid fuel is being delivered to the EPR:
Inspect fuel tank to verify it has a sufficient
amount of fuel.
Verify the manual shut off valve on the
LPG tank is fully opened.
Verify that the excess flow valve has not
been activated.
Inspect fuel tank to ensure it is properly
mounted and rotated to the correct posi-
tion.
Inspect the hoses leading from the tank
ensuring they are properly connected and
do not have any kinks or damage.
TOOLS REQUIRED:
7/16” Open end wrench (for test port
plugs)
Test port adapter
DST
Diagnostic Scan Tool (DST)
PRESSURE GAUGES
0-15 PSI Gauge
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