Crown Victoria V8-4.6L CNG SOHC VIN 9 (1999)
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The following venting procedures must be used when removal of the fuel tanks or fuel tank solenoid valves is required for the installation of new
fuel tanks or fuel tank solenoid valves.
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It is recommended that venting be performed with a vent stack. This is a typical installation only. Any vent stack installation must be approved by
local authorities.
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The following procedures are based on the fuel tank solenoid valves status. Based on the results of the solenoid status found, follow the
appropriate procedure for either fuel tank solenoid valves normal, stuck open or stuck closed.
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The pressure relief procedure to be followed depends on the component(s) being serviced, what component(s) may be damaged or inoperative, or
at what point in fuel system procedures you are referenced to this procedure. The status of the fuel tank solenoid valves is the most critical factor
in determining the proper fuel system pressure relief procedures to follow. Pressure relief procedures are fuel line venting and fuel tank venting,
with fuel tank venting having three parts depending on fuel tank solenoid status.
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The fuel line venting procedure is accomplished at the Schrader valve fitting on the fuel injection supply manifold. This will vent the fuel lines
from the fuel supply manifold to the fuel tank solenoids (or the quarter-turn valve if it is closed). It is required prior to installation of any fuel
system component, since the fuel pressure regulator is not designed to backflow reliably. This procedure is used either in conjunction with the fuel
tank venting procedure to make sure of complete fuel system pressure relief, or on its own if the fuel tank solenoid status is good or the
quarter-turn valve is closed. Any fuel system component downstream of the fuel tank solenoid valves (or the quarter-turn valve if closed) may be
serviced. This includes the fuel supply manifold and its related components, the fuel shutoff valve solenoid, the coalescer/filter assembly, the fuel
pressure regulator, and all the fuel lines if the fuel tank solenoid status is good or the low pressure fuel lines if the quarter-turn valve is closed.
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The fuel tank venting procedure is accomplished at the fuel fill valve and should only be performed when a damaged, expired, or inoperative fuel
tank or fuel tank solenoid valve is detected. The fuel tank venting must be confirmed with the use of the Rotunda Manual Override Tool
134-OOO5O (or equivalent). Once the override tool has been used, a new fuel tank solenoid must be installed, as the use of the override tool will
destroy the solenoid valve. This procedure must be preformed to vent any fuel tank with a stuck open or stuck closed solenoid valve or to vent any
fuel tank for any reason.
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The special tools required for these procedures are also available in a kit form that comes with all the tools needed to service this vehicle. The kit
is the Rotunda Natural Gas (NGV) Pressure Test and Venting Kit, 134-00114.
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It is recommended that venting be performed with a vent stack. This is a typical installation only. Any vent stack installation must be approved by
local authorities.
