Service Manual

WEICHAI EMISSION-RELATED INSTALLATION INSTRUCTIONS
NATURAL GAS/WELLHEAD GAS FUEL SYSTEM
The fuel first passes the fuel shut-off valve when the engine starts cranking. Then it goes through the
DEPR and comes into the mixer to be mixed with the air from the air filter as shown in Figure 11.
Figure 11 Natural Gas/Wellhead Gas Fuel System
LPG & NG DUAL FUEL SYSTEM
When the engine operates with LPG, the NG shutoff valve will be closed. The LPG first enters the LPG
shutoff valve and then goes to LPG evaporator to turn the LPG to vapor and later enters the DEPR and
further mixes with the air in the mixer as shown in Figure 12.
Figure 12: LPG & NG Dual fuel system
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