DSG-423 FUEL SYSTEM
04-7
GENERAL INFORMATION - DRY FUEL
Description
This engine with the proper fuel equipment, can also
operate on dry fuel such as LPG Grade HD5 and natural
gas (1050 BTU/ft
3
). Natural Gas fuel specification must
meet or exceed 38.7 MJ/m
3
(UK) 39.0 MJ/m
3
(USA).
Vaporized propane is introduced into the engine with a
Vapor Carburetor. Pressure is regulated by an
Electronic Pressure Regulator (EPR) which is controlled
by the GCP. Coolant is circulated through the EPR.
Operation
The dry fuel vapor carburetor is a device by which fuel
can be added to passing air flow. The amount of fuel
added is related to the amount of air passing through
the carburetor.
The variable venturi carburetor controls fuel flow based
on a differential pressure across the diaphragm. The
more air the engine demands, the lower the pressure in
the throat and hence on the top of the diaphragm. When
the pressure on the top of the diaphragm is low enough,
the diaphragm overcomes the spring force holding it
down and lifts and allows fuel to be drawn from the fuel
port into the air flow into the engine.
The greater the airflow into the engine, the greater the
pressure drop across the diaphragm and the more lift
occurs on the fuel valve. This allows more fuel to be
GCP
Vapor
Vapor
Carburetor
Propane
Line
Liquid
Propane
Line
Engine
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