2001 GMC Savana 1500 Fuel Pressure Regulator

You need to turn the ignition off, remove the CNG 20-amp fuse to prevent a CNG prime pulse from occurring during service, and slowly open the fittings to release any remaining pressure when disconnecting a fuel line.

You should perform this procedure only after approved diagnostic procedures have isolated a CNG system component replacement or CNG system components that require removal for other vehicle repairs.

You should vent the CNG fuel system in a well-ventilated work area, keep sparks, flames, and smoking material away from the area, and wear the appropriate hearing protection during the venting procedure.

You need to disconnect the negative battery cable, loosen the fuel filler cap to relieve the tank vapor pressure, remove the engine cover, connect a J 34730-1A, or the equivalent, to the fuel pressure connection, wrap a shop towel around the fitting while connecting the gauge to avoid spillage, install the bleed hose into an approved container and open the valve to bleed the system pressure and drain any fuel remaining in the gauge into an approved container.

You should tighten any loosened fittings to the correct torque, open the manual lock-down screws located on the HPL manual shut-off fittings, and leave the manual lock-down screws closed on any vehicle that will require CNG fuel TANK venting.