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WSG-1068 FUEL SYSTEM
GENERAL INFORMATION
System Operation - LPG
High pressure liquefied Petroleum Gas passes through a
solenoid operated fuel shut-off valve into an engine
coolant heated vaporizer/regulator unit where it is
converted into a low pressure gas. This gas is then fed
into the carburetor body/mixer where a vacuum operated
gas metering valve ensures that the correct air-to-fuel
ratio is maintained.
When the engine is switched off, the electrical supply to
the fuel shut-off solenoid is disconnected and the valve
closes, cutting off the high pressure fuel supply to the
vaporizer/regulator. The electrical supply to fuel shut-off
valve passes through a vacuum operated safety switch.
Should the engine stall, the vacuum switch opens and
cuts off the electrical supply to the fuel shut-off valve.
When starting the engine, there is sufficient vacuum
present, even at cranking speed, to close the safety
switch.
FUEL SYSTEMS – FIELD CALIBRATIONS/GENERAL
When performing field calibrations on LPG & NG
systems, it should be noted that improper fuel
calibrations and/or improper hardware installation may
result in decreased durability/life of the cylinder head
valve train. Validation testing on the valve train was
conducted in a controlled laboratory environment with
proper air-fuel distribution and proper air-fuel ratios
which fall within acceptable ranges.
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