C 2500 Suburban 2WD V8-454 7.4L VIN J SFI (1998)
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Use the J 42435 CNG Tank Vent Kit with a vent stack.
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Vent the CNG fuel tank 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 may cause hearing
damage.
7.
Connect the ground strap (2) (attached to the vent hose) to the HPL and the vent stack (earth) ground.
8.
Remove the manual shut-off fitting from the HPL.
9.
Before installing the manual vent tool, count the number of turns required to rotate the tool from fully retracted to fully extended. When venting
the CNG tank, ensure that you rotate the tool the same number of turns. This will ensure that the HPL pilot valve is un-seated and the tank is
vented. Some pressure should always vent from the CNGC tank.
Verify that the manual vent tool supplied from the J 42435 is in the non-venting position with the Allen screw fully seated counterclockwise.
10.
Install the manual vent tool into the HPL port.
11.
Slowly turn the manual vent tool Allen screw clockwise until natural gas begins to vent.
12.
Allow the CNG fuel tank to vent until the pressure gauge reads 0 kPa (0 psi). If the tank stops venting and pressure is indicated on the J 42435
gauge, inspect the vent line for a frozen fitting. The fitting will eventually thaw and fuel will again continue to vent.
