Fuel Pump Pressure Inspection (Miata)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Mazda Tribute, 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, and 2003 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect negative battery cable. Raise vehicle and support with safety stands. Remove fuel filter cover. Disconnect quick release fuel line connector. Refer to FUEL LINE CONNECTORS (MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. Install Fuel Pressure Gauge (49-N013-1A0C) onto fuel filter fitting until click is heard. Pull quick release connector by hand and ensure fuel line is installed securely. Turn lever on fuel pressure gauge to plug gauge outlet. Go to next step.
- Reconnect negative battery cable. Connect a fused jumper wire between DLC-1 F/P terminal and body ground. See Figure. Turn ignition on to operate fuel pump and observe fuel pressure. See FUEL PUMP MAXIMUM PRESSURE SPECIFICATIONS table. If fuel pressure is not as specified, turn ignition to LOCK position and check following:
- Fuel pump.
- Fuel pump relay.
- Fuel filter for clogging.
- Fuel line for restriction or leakage.
- Turn ignition on for 10 seconds to operate fuel pump. Turn ignition back to LOCK position. Wait 5 minutes and observe fuel pressure. See FUEL PUMP HOLD PRESSURE SPECIFICATIONS table. If fuel pump hold pressure is not as specified, replace fuel pump. After repair, go to next step.
- Disconnect fused jumper wire. Disconnect fuel pressure gauge and reconnect fuel line to fuel filter. Pull quick release connector by hand and ensure fuel line is installed securely. Complete AFTER REPAIR PROCEDURE .
FUEL PUMP MAXIMUM PRESSURE SPECIFICATIONS
| Application | Pressure psi (kPa) | ||
|---|---|---|---|
| Mazda6 | (1) | ||
| Miata | 92 (634) | ||
| MPV | 87-115 (600-793) | ||
| Protege & Protege5 | 64-92 (441-634) | ||
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