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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Engine Controls - Tests W/Codes - 3.3L CNG) >> Fuel Pressure Release >> Fuel Cylinder Purging

Fuel Cylinder 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.
  1. Open manual shutoff valve. Open only the fuel control valve(s) (counterclockwise) on the fuel cylinder(s) to be serviced. Close all other control valve(s) (clockwise) on fuel cylinder(s) not being serviced.
  2. Start and operate engine until it runs out of fuel. Attempt 3 more engine starts. At this point, all fuel tubes and opened cylinders are purged of natural gas between fuel cylinders and engine. It is now okay to open fuel system for repair.
CAUTION: Fuel cylinders not being serviced still contain high pressure fuel.
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