TP-5700 7/9330 Section 6 Fuel Systems
6.7 Natural or LP Gas Fuel
Systems
Natural and LP (liquified petroleum) gas fuel systems
should be designed and installed in accordance with the
requirements of NFPA 54, National Fuel Gas Code, and
all applicable local codes. Various types of gas fuel
systems are available as follows:
D LP Gas Vapor (Figure 6-5 and Figure 6-6)
D LP Gas-Liquid Withdrawal (Figure 6-7)
D Combination Natural Gas and LP Gas (Figure 6-8
and Figure 6-9)
D Natural Gas (Figure 6-10)
D Combination LP Gas or Natural Gas and Gasoline
(Figure 6-11)
The engine-mounted components of all these systems
are similar and usually include a carburetor, secondary
gas regulator, electric gas fuel solenoid shutoff valve,
and flexible fuel connector.
1
2
3
4
5
1. Primary regulator (supplied by gas supplier or customer)
2. Pressure gauge
3. Solenoid valve
4. Secondary regulator
5. Carburetor
Figure 6-5 LP Gas Vapor Fuel System
1 2 3 4
5
1. Carburetor
2. Secondary regulator
3. Solenoid valve
4. Pressure gauge
5. Primary regulator (supplied by gas supplier or installer)
Figure 6-6 Typical LP Gas Vapor-Withdrawal
System
1 2 3 4
TP-5700-6
1. Carburetor
2. Converter (vaporizer)
3. Solenoid valve
4. LP gas filter (supplied by gas supplier or installer)
Figure 6-7 LP Gas Liquid Withdrawal System
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