WEICHAI & PSI SERVICE MANUALS AVAILABLE ONLINE AT FLYPARTSGUY.COM VPG SINGLE FUEL SYSTEM For single VPG fuel application, the same shut-off valve as NG is used to turn on or off the fuel, but the shut-off valve needs to be connected with the secondary fuel connector from the harness as Secondary Lock-off (LPG) only. COOLING SYSTEM Figure 13 shows the configuration of the cooling system. Figure 13 Cooling System WEICHAI EMISSION-RELATED INSTALLATION INSTRUCTIONS GET YOUR WEICHAI & AFTERMARKET SERVICE PARTS AT FLYPARTSGUY.COM