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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (3.3L V6 CNG - VIN [J]) >> Removal & Installation >> Fuel Line Purging

Fuel Line Purging

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Ensure vehicle is not near open flame when performing fuel line purging.
NOTE: Fuel line purging must be performed when servicing any components except fuel cylinders or fuel cylinder control valves. If servicing fuel cylinders or fuel cylinder control valves, see FUEL CYLINDER PURGING .
  1. Rotate fuel cylinder control valves clockwise to the closed position. See Fig 1. Ensure fuel control valves are closed on all 4 fuel cylinders.
  2. Rotate manual shutoff valve to the open position so it is in line with the fuel line. Manual shutoff valve is located near front fuel cylinder. See Fig 1. If manual shutoff valve is at 90° angle to the fuel line, it is in the closed position. Ensure manual shutoff valve is in line with the fuel line.
  3. Start and operate engine until it stalls. Attempt to start engine 3 more times.
    CAUTION: Use care when loosening fuel line fittings, as some fuel pressure may still exist in fuel lines.
  4. Gradually loosen fuel line fitting at component being serviced, allowing fuel pressure to bleed off. Use care when loosening fuel line fitting, as fuel line may still be under pressure. Once fuel pressure is released, fuel system components can be serviced.
Fig 1: Fuel Cylinder Control Valves & Manual Shutoff Valve ID
G94J65903Courtesy of CHRYSLER CORP.