Fuel Pressure
CAUTION:
Constant fuel pressure is maintained in fuel lines and component parts at all times. Relieve pressure before attempting to open system for testing. Do not allow fuel to flow onto engine or electrical parts or allow an open flame in area while testing fuel system components.
- To release fuel system pressure unplug fuel pump connector in right rear tool box. After engine stalls, crank engine 2 or 3 times. Turn ignition off. Connect fuel pump electrical connector.
- Remove fuel filter-to-fuel rail hose and connect a pressure gauge using a "T" fitting. Start engine and read fuel pressure at idle. If pressure is not as specified, replace pressure regulator and repeat test.
- Disconnect vacuum line from fuel pressure regulator and connect a hand vacuum pump. Disconnect the fuel pump connector and apply battery power.
- As vacuum is applied to pressure regulator, pressure reading should decrease. See FUEL PRESSURE SPECIFICATIONS table. If pressure and vacuum readings do not conform to specifications, replace fuel pressure regulator.
FUEL PRESSURE SPECIFICATIONS
| Condition: In. Hg | Pressure: psi (kg/cm2 ) | ||
|---|---|---|---|
| Idle (1) | 30 (2.1) | ||
| 0 | 36-37 (2.5-2.6) | ||
| 5 | 33-35 (2.3-2.5) | ||
| 10 | 31-32 (2.2-2.3) | ||
| 15 | 29-30 (2.0-2.1) | ||
| 20 | 26-28 (1.8-2.0) | ||
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