MAINTENANCE
1550 Gas/LPG/Diesel MM283 (9--01)
3--18
FUEL SYSTEM -- LPG
LPG FUEL SYSTEM
The liquid withdrawal LPG fuel system is made up
of five components which are: the LPG fuel tank,
pressure relief valve, fuel filter lock,
vaporizer-regulator, and the carburetor.
Liquid LPG fuel flows from the LPG tank, under its
own pressure, to the pressure relief valve. This
valve is normally closed, preventing LPG fuel from
escaping into the atmosphere. The valve opens to
relieve pressure if the fuel pressure exceeds
system limits. From the pressure relief valve, the
liquid LPG fuel is piped to the fuel filter lock. The
fuel filter lock filters unwanted tank scale and
deposits out of the LPG fuel. The fuel filter lock
also stops the flow of LPG fuel when the engine is
not operating. The oil pressure switch controls the
fuel filter lock. When the engine oil pressure is
4 psi (30 kPa) or greater, the oil pressure switch
permits an electrical current to open the fuel filter
lock which allows LPG fuel to flow on to the
vaporizer-regulator. The oil pressure switch is
bypassed when the engine is being started,
allowing LPG fuel to flow.
The vaporizer section of the vaporizer-regulator
converts the liquid LPG fuel into a gaseous LPG
fuel. From the vaporizer section, the gaseous
LPG fuel is sent to the primary regulator section
of the vaporizer-regulator. The primary regulator
section reduces the pressure of the LPG fuel. The
secondary regulator section reduces the LPG fuel
pressure to the level required by the carburetor.
From the vaporizer-regulator, the LPG fuel is sent
to the carburetor where it is finally metered into
the air flow which is sent to the engine
combustion chamber.
IN--LINE FUEL FILTER --GM ENGINES (For
machines serial number 001424 and above)
The in--line fuel filter is located between the
lock--off solenoid and the fuel line leading to the
vaporizer--regulator. Replace the fuel filter every
400 hours of operation.
A
B
C
D
E
F
G
03511
LPG FUEL SYSTEM -- CONTINENTAL
ENGINES (For machines below serial number
001424)
A. Carburetor
B. Vaporizer-Regulator
C. Fuel Filter Lock
D. Pressure Relief Valve
E. Tank Service Valve
F. LPG Fuel Tank
G. Oil Pressure Switch
A
B
C
D
E
F
G
H
LPG FUEL SYSTEM -- GM ENGINES (For
machines serial number 001424 and above)
A. Electronic Fuel Injection Assembly
B. Vaporizer-Regulator
C. Fuel Filter Lock
D. Pressure Relief Valve
E. Tank Service Valve
F. LPG Fuel Tank
G. Oil Pressure Switch
H. Fuel Filter
Summary of Contents for 1550
Page 16: ...SPECIFICATIONS 1550 Gas LPG Diesel MM283 6 91 1 2 ...
Page 100: ...APPENDIX 1550 Gas LPG Diesel MM283 6 91 4 2 ...
Page 112: ...STANDARD PARTS 1550 Gas LPG Diesel MM283 11 07 6 6 ...
Page 237: ...STANDARD PARTS 6 131 1550 Gas LPG Diesel MM283 3 11 ...
Page 286: ...STANDARD PARTS 1550 Gas LPG Diesel MM283 8 02 6 180 ...
Page 301: ...LPG PARTS 7 15 1550 Gas LPG Diesel MM283 11 07 ...
Page 363: ...DIESEL PARTS 8 53 1550 Gas LPG Diesel MM283 2 05 ...
Page 378: ...DIESEL PARTS 1550 Gas LPG Diesel MM283 2 05 8 68 ...
Page 436: ...BREAKDOWNS 1550 Gas LPG Diesel MM283 8 02 10 38 ...
Page 456: ...CONTINENTAL ENGINE BREAKDOWN GASOLINE LPG 1550 Gas LPG Diesel MM283 2 95 11 20 ...
Page 534: ...PERKINS ENGINE BREAKDOWN DIESEL 1550 Gas LPG Diesel MM283 9 01 15 30 ...
Page 562: ...1011676 CAT ENGINE BREAKDOWN DIESEL 1550 Gas LPG Diesel MM283 2 05 16 28 ...