Test Notes

You should enter this Pinpoint Test only when directed here.

This Pinpoint Test is intended to diagnose the following:
- Fuel Pressure
- Fuel Supply Lines
- Fuel Filter
- Fuel Injectors
- Fuel Pressure Regulator
- Fuel Injection Supply Manifold (Fuel Rail)
- Solenoid Shut-Off Valves

DESCRIPTION
For additional information on the Natural Gas Fuel System, refer to Fuel Delivery and Air Induction / Description and Operation.


WARNING:
NATURAL GAS IN THE FUEL SYSTEM IS AT HIGH PRESSURE AT ALL TIMES. TO AVOID INJURY OR FIRE, RELEASE THE FUEL PRESSURE FROM THE FUEL SYSTEM BEFORE DISASSEMBLING ANY FUEL SYSTEM COMPONENT. TO RELEASE THE PRESSURE FROM THE SYSTEM FOLLOW THE PRESSURE RELIEF PROCEDURE:


PRESSURE RELIEF PROCEDURE
- CLOSE THE 1/4 TURN MANUAL FUEL SHUT-OFF VALVE, OR, THUMP INERTIA FUEL SHUTOFF (IFS) SWITCH AND VERIFY THE BUTTON HAS BEEN UPSET (DO NOT RESET).
- CONNECT NATURAL GAS FUEL PRESSURE TESTING KIT 134-00114 AT THE SCHRADER VALVE LOCATED ON THE INJECTION SUPPLY MANIFOLD. TESTING KIT VALVE SHOULD BE CLOSED.
- POSITION THE TESTING KIT VENTING HOSE TO A WELL VENTILATED LOCATION, PREFERABLY OUTSIDE OR INTO VENT STACK.
- GRADUALLY OPEN THE TESTING KIT VALVE TO RELIEVE THE FUEL PRESSURE IN THE VEHICLE FUEL SYSTEM AND ALLOW IT TO ESCAPE.


CAUTION:
Use care to prevent combustion from escaping fuel. No smoking, open flames or any kind of arcing.

SAFE FUEL HANDLING PRACTICES
Natural Gas-Fire
- REPORT ALL FIRES to the appropriate authorities.
- FLAMES from natural gas have a yellow and/or blue color.
- Know the locations of PORTABLE FIRE EXTINGUISHER, FIRE BLANKETS, and FIRE ALARMS. Learn how to use them.
- Use a FIRE BLANKET to fight flammable gas fires.

FIRST AID
- When overcome by vapors, if safe, MOVE VICTIM TO FRESH AIR. If not breathing, give artificial respiration or Cardiopulmonary Resuscitation (CPR) as appropriate. SEEK MEDICAL ATTENTION IMMEDIATELY.
- If IRRITATES EYES, FLUSH with large amounts of water for 15 minutes. Remove contact lenses, if worn. SEEK MEDICAL ATTENTION.

HEALTH
- NATURAL GAS (and all other fuel vapors) may be HARMFUL BY INHALATION.
- ALL FUELS may be HARMFUL OR FATAL IF SWALLOWED.
- FUELS AND PRODUCTS containing methanol (e.g. windshield washer fluid) may cause blindness if swallowed.
- ALL FUELS are IRRITATING to the EYES and RESPIRATORY SYSTEM.

HANDLING
- Be aware of the MERCUROUS MERCAPTAN "ROTTEN EGG" smell of natural gas.
- Use FLAMMABLE GAS HANDLING PRECAUTIONS.
- Keep flammable gases in APPROVED, LABELED CONTAINERS.
- Use in WELL-VENTILATED AREAS and CONTROL VAPORS. Be aware that natural gas IS NOT VISIBLE, is lighter than air, can travel along the ceiling, and may collect in high hollows.
- When transferring flammable gases, CONNECT THE VENT STACK to the SOURCE and GROUND the SOURCE to the EARTH.
- DO NOT SMOKE, or use HEAT/SPARK PRODUCING EQUIPMENT near natural gas.
- DO NOT eat, drink or smoke where fuels are handled, processed or stored.
- WASH HANDS thoroughly after HANDLING any FUEL.

LEAKAGE
- Notify the proper authorities in the EVENT of any leakage you have NOT been trained to address.
- STOP, and allow fuel to VENTILATE TO OUTSIDE ATMOSPHERE after any fuel escape.

NOTE:
- A small amount of pressure (3 psig) will remain in the fuel rail.
- High pressure still exists in the fuel tanks and upstream of the 1/4 turn manual fuel shutoff valve is closed.
- When pressurizing the fuel system, if 1/4 turn manual fuel shut-off valve is open, leave open. If the valve is closed, slowly open the valve.