FUEL SYSTEM
| WARNING | ALWAYS relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. |
FUEL SYSTEM PRESSURE RELEASE
| CAUTION | When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION section before disconnecting battery. |
Multiport Fuel Injection (MFI Except 3.0L)
- Turn ignition off. Disconnect negative battery cable. Slowly open fuel tank cap to release pressure in tank. Remove fuel rail pressure test port cap. Place open end of Fuel Pressure Release Hose (C-4799-A) in approved gasoline container.
- Connect other end of pressure release hose to test port. As fuel pressure release hose is tightened onto fuel rail pressure test port, fuel pressure will bleed-off into container.
| CAUTION | DO NOT energize only one injector to relieve fuel pressure. Energize 3 different injectors. Energizing only one injector to relieve all fuel pressure may hydrostatically lock engine. DO NOT ground injector for more than 5 seconds. |
Multiport Fuel Injection (MFI 3.0L)
- Turn ignition off. Slowly open fuel tank cap to release pressure in tank. Disconnect injector 7-pin connector. Connect a jumper wire between injector connector (injector side) Dark Green/Orange wire and battery positive terminal. CAUTION: DO NOT ground jumper wire more than 5 seconds.
- Connect a second jumper wire to injector connector (injector side) White/Dark Blue wire. Momentarily ground jumper wire connected to White/Dark Blue wire. Injector No. 1 will energize (open), relieving some fuel pressure. Remove jumper wire from White/Dark Blue wire.
- Connect jumper wire to injector connector (injector side) Brown wire. Momentarily ground jumper wire connected to Brown wire no more than 5 seconds. Injector No. 2 will energize (open), relieving some fuel pressure. Remove jumper wire from Brown wire.
- Connect jumper wire to injector connector (injector side) Yellow/White wire. Momentarily ground jumper wire connected to Yellow/White wire no more than 5 seconds. Injector No. 3 will energize (open), relieving some fuel pressure. Remove jumper wire from Yellow/White wire.
- Remove jumper wire from Dark Green/Orange wire. Energizing 3 different fuel injectors should have relieved enough fuel pressure to safely open fuel system. Use caution when opening fuel system, some residual fuel pressure may be present.
Throttle Body Injection (TBI)
- Slowly open fuel tank cap to release pressure in tank. Disconnect injector 2-pin connector at edge of throttle body. Connect a jumper wire between injector connector (injector side) Dark Green/Orange wire and battery positive terminal.
- Connect another jumper wire to injector connector (injector side) White/Dark Blue wire. Momentarily ground jumper wire connected to White/Dark Blue wire no more than 5 seconds. Injector will energize (open), relieving fuel pressure. Remove jumper wires. Fuel pressure is now released.
