Fuel Pump Circuit

Fuel pump is located inside fuel tank. Locate DLC-1 on left side of engine compartment. Connect a fused jumper wire between DLC-1 "F/P" terminal and body ground. See Fig 1. Remove fuel filler cap. Turn ignition on. Listen for fuel pump operation at fuel filler pipe. If fuel pump does not operate, go to next step. If fuel pump operation is heard, reinstall fuel filler cap. Testing is complete.
Disconnect fuel pump 4-pin harness connector. Refer to FUEL PUMP under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. Using DVOM, check for continuity between fuel pump 4-pin connector terminals "B" and "D". See Fig 2, Fig 3 or Fig 4 . If continuity is not present, replace fuel pump. If continuity is present, check for open or short circuit in wiring harness between fuel pump, fuel pump relay and body ground. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

Fig 1: Identifying DLC-1 Terminals

Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying Fuel Pump 4-Pin Connector & Terminals (Mazda6 & MPV)

Courtesy of MAZDA MOTORS CORP.

Fig 3: Identifying Fuel Pump 4-Pin Connector & Terminals (Miata)

Courtesy of MAZDA MOTORS CORP.

Fig 4: Identifying Fuel Pump 4-Pin Connector & Terminals (Protege & Protege5)

Courtesy of MAZDA MOTORS CORP.

NOTE: Fuel Pump Maximum Pressure Inspection procedure and specifications for Mazda6 are not available from manufacturer.