Fuel Line Pressure
- Disconnect negative battery cable. Install fuel pressure gauge in fuel supply line. Reconnect negative battery cable. Locate data link connector in left side of engine compartment. Connect a jumper wire between data link connector terminals F/P and GND. See Figure . Turn ignition on and observe fuel line pressure. See FUEL LINE PRESSURE table.
- If fuel line pressure is high, check for plugged return line. If no problem is found, replace fuel pressure regulator. If fuel line pressure is low, check fuel pump maximum pressure. See FUEL PUMP MAXIMUM PRESSURE . If fuel pump maximum pressure is as specified, check for plugged or restricted fuel line or fuel filter. Repair as necessary. If no problems are found, check pressure regulator hold pressure. See FUEL PRESSURE REGULATOR HOLD PRESSURE .
FUEL LINE PRESSURE
| Application | Pressure psi (kg/cm2 ) | |
|---|---|---|
| Miata | 53-61 (3.7-4.3) | |
| Millenia | ||
| 2.3L | 41-48 (2.8-3.4) | |
| 2.5L | 38-46 (2.7-3.2) | |
| MPV | 55-61 (3.8-4.3) | |
| Protege | 41-46 (2.8-3.2) | |
| 626 | 38-46 (2.7-3.2) | |