Fuel Pump Pressure Inspection (MPV)
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. Release fuel pressure. See FUEL PRESSURE RELEASE . Disconnect quick release connector on fuel inlet hose near fuel rail. (May require removal of air cleaner.) Refer to FUEL LINE CONNECTORS (MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 under FUEL SYSTEM in REMOVAL OVERHAUL & INSTALLATION article. Install fuel pressure gauge to fuel inlet hose from fuel tank. Refer to Figure. Turn lever 90 degrees against hose of fuel pressure gauge to plug gauge outlet line. Go to next step.
- Connect a fused jumper wire between DLC-1 F/P terminal and body ground. Turn ignition to operate fuel pump. Measure fuel pump maximum pressure. For fuel pressure specifications, see FUEL SYSTEM
in SERVICE & ADJUSTMENT SPECIFICATIONS article. If fuel pressure is not as specified, inspect 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 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, check for restriction or leaks in fuel filter and fuel line. Repair as necessary. After repair, go to next step. If no problems are found, replace fuel pump. After repair, go to next step.
- Disconnect fused jumper wire. Disconnect fuel pressure gauge and reconnect fuel line quick release connector. Reinstall air filter if required. Complete AFTER REPAIR PROCEDURE .