Fuel System
FUEL PRESSURE RELEASE AND SERVICING FUEL SYSTEMFuel in the fuel system is under high pressure when the engine is not running.
Warning: Fuel vapor is hazardous. It can very easily Ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
Warning: Fuel line spills and leaks are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedures".
FUEL LINE SAFETY PROCEDURES
A. Release the fuel pressure before disconnecting a fuel line.
1. Start the engine.
2. Remove the fuel pump relay.
3. After the engine stalls, turn the ignition switch to OFF.
4. Install the fuel pump relay.
B. Avoid leakage
1. When disconnecting a fuel line hose, wrap a rag around it to protect against fuel leakage.
2. Plug the hose after removal.
C. Install hose clamps to secure the fuel pressure gauge to fuel filter and the main hose.
FUEL PRESSURE HOLD INSPECTION
1. Disconnect the negative battery cable.
2. Install a fuel pressure gauge.
3. Connect the negative battery cable.
Data Link Connector:
4. Connect the data link connector terminals F/P and GND with a jumper wire.
5. Turn the ignition switch ON for 10 Sec. to operate the fuel pump.
6. Turn the ignition switch OFF and disconnect the jumper wire.
7. Observe the fuel pressure after 5 min.
Fuel pressure: More than 150 kPa (21 psi)
8. If not as specified, perform the following inspections.
- Fuel pump
- Pressure regulator
- Fuel injector leakage
FUEL LINE PRESSURE INSPECTION
1. Disconnect the negative battery cable.
2. Install a fuel pressure gauge. (Install clamps as shown.)
3. Connect the negative battery cable.
Data Link Connector:
4. Connect the data link connector terminals F/P and GND with a jumper wire.
5. Turn the ignition switch ON.
6. Measure the fuel line pressure.
Fuel line pressure: 270-310 kPa (39-45 psi)
Pressure low - Measure fuel pump maximum pressure. If as specified, fuel line or fuel filter might be clogged or restricted.
Pressure high - Replace pressure regulator.