Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 46 (ENGINE CONTROLS - SELF-DIAGNOSTICS)SYSTEM TESTSFUEL PUMP INSPECTION
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Fuel Pump Inspection
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Fuel Pump Inspection
WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
- Check Fuel Pump For Operation
Verify vehicle battery is fully charged. Verify fuel tank electrical connector is securely connected. With KOEO, connect scan tool to DLC. Select Active Command Mode. Select Output Test Mode. Press Mode to change to ALL ON mode. Press Start to run fuel pump. Listen to fuel pump to verify fuel pump operation. Turn ignition off. If fuel pump operates, see FUEL DELIVERY SYSTEM under SYSTEM TESTS. If fuel pump does not operate, go to next step. - Check Fuel Pump For Continuity
Disconnect fuel tank assembly connector. Using a DVOM, check for continuity between fuel tank unit power circuit (Pink/Black wire) and ground circuit (Black wire). If continuity is present, go to next step. If continuity is not present, replace faulty fuel pump. - Check Voltage At Fuel Pump Vehicle Harness Connected
Connect scan tool to DLC. With KOEO, select Active Command Moded. Select Output Test Mode. Press Mode to change to ALL ON mode. Press Start to run fuel pump. Measure voltage at fuel tank assembly harness connector (Pink/Black wire). If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check fuel pump relay and fuel pump shutoff switch. Repair as necessary. - Check Fuel Pump Ground Circuit
Disconnect fuel tank assembly harness connector. Measure resistance between fuel pump ground circuit (Black wire) and chassis ground of fuel tank assembly harness connector. If resistance is less than one ohm, ground circuit is okay. Recheck fuel pump. If resistance is one ohm or more, repair open circuit between harness connector and chassis ground.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.