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HPL inlet port.
Fig. 13:
Identifying CNG Fuel System Components
Courtesy of General Motors Corp.
FUEL SYSTEM PRESSURE RELEASE (GASOLINE)
WARNING: Always relieve fuel pressure before disconnecting any fuel
injection-related component. DO NOT allow fuel to contact
engine or electrical components.
Fuel system is under pressure. Pressure must be relieved
prior to servicing fuel system. Fuel pressure may be relieved by using
one of the following methods:
*
On 1.3L and 1.8L, loosen fuel filler cap to relieve
tank pressure (do not tighten at this time). On 1.3L
and 1.8L, remove fuel pump relay. On all models, start
and run engine until it stalls. Crank starter for 3
seconds to remove remaining fuel from fuel lines. Turn
ignition off. Reinstall circuit opening relay or fuel
pump relay. Disconnect negative battery cable to avoid
possible fuel discharge in accidental attempt to start
engine.
*
On 1.9L, 3.0L, 3.1L, 3.4L, 3.5L, 3.8L, 4.0L, 4.6L and
5.7L, disconnect negative battery terminal. Loosen
fuel filler cap. Install Fuel Pressure Gauge (J-34730-1A)
on fuel pressure connector of fuel rail. Wrap shop
towel around pressure connection when installing fuel
pressure gauge to absorb fuel leakage. Install gauge
bleed hose in container. Open bleed valve to bleed
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