Fuel Pressure: Testing and Inspection
Inspection1. Relieve fuel pressure.
2. Remove the 12 mm banjo bolt from the fuel filter while holding the fuel filter with another wrench. Attach the 12 mm fuel pressure adapter bolt, and the special tool.
3. Start the engine. Measure the fuel pressure with the engine idling and the vacuum hose of the fuel pressure regulator disconnected from the intake manifold and the intake manifold port capped. If the engine will not start, turn the ignition switch ON (II), wait for two seconds, turn it off, then back on again and read the fuel pressure.
Pressure should be: 280 - 330 kPa (2.9 - 3.4. kg/sq.cm, 41 - 48 psi)
4. Reconnect vacuum hose to the fuel pressure regulator.
Pressure should be: 250 - 300 kPa (2.6 - 3.1 kg/sq.cm, 37 - 44 psi)
If the fuel pressure is not as specified, first check the fuel pump. If the fuel pump is OK, check the following:
- If the fuel pressure is higher than specified, inspect for:
- Pinched or clogged fuel return hose or line.
- Faulty fuel pressure regulator
- If the fuel pressure is lower than specified, inspect for:
- Clogged fuel filter.
- Faulty fuel pressure regulator
- Fuel line leakage.