Fuel Pump Maximum Pressure Inspection
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Mazda Tribute, 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, and 2002 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect negative battery cable. Release fuel pressure. See FUEL PRESSURE RELEASE . Disconnect fuel inlet hose at fuel rail. Install fuel pressure gauge to fuel inlet hose and plug fuel pressure gauge outlet hose. On 626, go to next step. On all other models go to step 3 .
- Locate and remove fuel pump relay. Ground fuel pump relay socket terminal No. 30. Reconnect negative battery cable to operate fuel pump. Observe fuel pressure. See FUEL PUMP MAXIMUM PRESSURE table. Disconnect negative battery cable and jumper wire. If fuel pressure is not as specified, replace fuel pump.
- Locate DLC-1 connector in left side of engine compartment. Connect a fused jumper wire between data link connector terminals F/P and GND. See Figure . Turn ignition switch on to operate fuel pump and observe fuel pressure. See FUEL PUMP MAXIMUM PRESSURE table. Turn ignition switch off and disconnect fused jumper wire. If fuel pressure is not as specified, replace fuel pump.
FUEL PUMP MAXIMUM PRESSURE
| Application | Pressure psi (kg/cm2 ) | |
|---|---|---|
| Miata | 92 (6.5) | |
| Millenia | ||
| 2.3L | 91-117 (6.4-8.2) | |
| 2.5L | 71-92 (5.0-6.5) | |
| MPV | 87-115 (6.1-8.1) | |
| Protege | 64-92 (4.5-6.5) | |
| 626 | 69-92 (4.8-6.5) | |