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support vehicle. Install hose pinching clamps on coolant inlet and
outlet lines at high pressure regulator. Remove coolant hoses from
high pressure regulator. Disconnect fuel outlet line from high
pressure regulator. Remove high pressure regulator.
Installation
To install, reverse removal procedure. Lubricate all "O"
rings with petroleum jelly before installation. Tighten all fasteners
to specification. See TORQUE SPECIFICATIONS. Check CNG system for
leaks. Check and refill coolant as needed.
LOW PRESSURE FUEL REGULATOR (CNG)
NOTE:
Procedures apply only to Cavalier models equipped with
Bi-Fuel engine components.
Removal & Installation
Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELEASE (CNG)
. Disconnect negative battery cable. Disconnect fuel lines and plug
openings. See Fig. 13. Remove low pressure fuel regulator. To install,
reverse removal procedure. Tighten all fasteners to specification. See
TORQUE SPECIFICATIONS. Check CNG system for leaks. Check and refill
coolant as needed.
FUEL RAIL & INJECTORS
NOTE:
If injector is replaced, ensure replacement injector has the
same part number as injector removed.
Removal (1.3L)
1) Relieve fuel pressure. See
FUEL SYSTEM PRESSURE RELEASE (GASOLINE). Disconnect negative battery
cable. Remove PCV valve and hose from intake and valve cover. Remove 3
intake manifold brace bolts and remove brace from engine. Disconnect
harness connectors from injectors.
2) Disconnect fuel pressure regulator vacuum hose. Disconnect
and plug fuel feed hose from fuel rail inlet pipe. Disconnect and plug
fuel return hose from fuel rail return pipe. Remove 2 fuel rail
retaining bolts. Remove fuel rail from intake manifold. Remove
injectors from fuel rail. Remove injector "O" rings and discard.
Installation
To install, reverse removal procedure. Coat NEW injector "O"
rings with clean engine oil. Ensure injectors rotate smoothly and
freely. If "O" ring is installed incorrectly, injector will bind.
Tighten fuel rail retaining bolts to specification. See
TORQUE SPECIFICATIONS. To complete installation, reverse removal
procedure.
Removal (1.8L)
1) Relieve fuel pressure. See
FUEL SYSTEM PRESSURE RELEASE (GASOLINE). Disconnect negative battery
cable. Disconnect 4 spark plug wires from 2 ignition coils. Disconnect
PCV and breather hoses from valve cover. Remove nut and accelerator
cable bracket from cylinder head.
2) Remove nuts and bolt from wire harness cover plate and
remove cover plate. Disconnect harness connectors from injectors. See
Fig. 14. Remove 2 bolts and pull back wiring harness. Disconnect and
plug fuel line. Remove fuel line hold-down bolt.
3) Remove 2 fuel rail retaining bolts. Remove fuel rail from
cylinder head. Remove 2 fuel rail spacers from cylinder head. Remove
injectors from fuel rail. Remove injector "O" rings and discard.
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