Savana 1/2 Ton Van V8-5.7L VIN R (2001)
6. While the engine is operating on CNG command the lock-off relay OFF and observe the fuel tank pressure sensor data parameter.
If the fuel pressure fails to decrease proceed to Step 7.
When the engine stalls or a switch-over to gasoline is observed, perform the following:
6.1. Turn the ignition OFF.
6.2. Remove the CNG 20-amp fuse in order to prevent a CNG prime pulse from occurring during service.
6.3. A small amount of CNG will remain in the fuel lines and components. Slowly open the fittings in order to release any remaining pressure
when disconnecting a fuel line.
6.4. Fuel Pressure Relief for the CNG system is now complete. Proceed to Step 12.
7. Close the manual lock-down screws located on both of the high pressure lock-off solenoid manual shut-off fittings by rotating the allen screws
clockwise until fully seated. Holes are provided in the side of the fuel tank frame in order to allow access to the manual shut-off fittings.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
8. Turn the ignition OFF and disconnect the negative battery cable.
CAUTION: When relieving the Compressed Natural Gas (CNG) fuel system pressure, take the following precautions in order to prevent fire
and personal injury:
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Vent the CNG fuel system in a well ventilated work area.
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Keep sparks, flames, and smoking material away from the area.
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Wear the appropriate hearing protection during the venting procedure. A sudden pressure loss from an uncontrolled gas leak can cause
hearing damage.
9. Slowly loosen the fuel line fitting at the high pressure regulator (HPR) INLET port (1) several turns. Do NOT remove the fitting.
10. If fuel is not venting with the HPR inlet fitting loosened, relieve fuel line tension by pulling the line away from the HPR.
