Understand the Symptoms of a Faulty Fuel Pump

• Difficulty Starting the Engine: A failing fuel pump may cause extended crank time or a no-start condition when turning the key.
• Engine Sputtering: If the fuel pump struggles to provide a consistent fuel supply, the engine may sputter or stall.
• Poor Performance: The vehicle might experience lack of power, poor fuel efficiency, or trouble maintaining speed.
• Noises: Listen for whining or humming noises from the fuel tank area when the vehicle is running.

Perform a Visual Inspection

• Check for Leaks: Inspect the area around the fuel tank for any visible signs of leaks or damaged components.
• Inspect Electrical Connections: Ensure the fuel pump wiring harness is secure and free of corrosion or damage.

Evaluate Fuel Pressure

• Obtain a Fuel Pressure Gauge: Purchase or rent a fuel pressure gauge that can connect to the vehicle's fuel system.
• Locate the Schrader Valve: Find the test port on the fuel rail of your Toyota RAV4, where you will connect the pressure gauge.
• Attach the Gauge: Securely connect the pressure gauge to the Schrader valve and ensure the connection is tight.
• Turn the Ignition: Turn the ignition key to the "ON" position without starting the engine, and observe the pressure reading on the gauge.
• Verify Pressure Levels: Compare your reading with the manufacturer's specifications for the 2015 Toyota RAV4 to determine if the fuel pressure is within the normal range.

Inspect the Fuel Pump Relay and Fuse

• Locate the Fuse Box: Open the fuse box located under the dashboard or in the engine compartment, as specified in the vehicle manual.
• Check the Fuel Pump Fuse: Identify and pull out the fuel pump fuse to inspect it for any signs of being blown or damaged.
• Test the Fuel Pump Relay: Examine and, if necessary, swap the fuel pump relay with another relay of the same type to verify proper operation.

Perform a Voltage Test

• Use a Multimeter: Set your multimeter to measure DC voltage.
• Test the Wiring: With the ignition key in the "ON" position, test the voltage at the fuel pump connector. You should see the voltage, indicating that power is reaching the pump.

Consider Professional Diagnostic Assistance

• If all tests indicate a fault yet the underlying issue remains elusive, a professional mechanic may use advanced diagnostic tools like an OBD-II scanner or oscilloscope to identify fuel pump problems.

By following these steps, you can effectively diagnose whether the fuel pump in your 2015 Toyota RAV4 is functioning properly or requires replacement. If you're unsure or uncomfortable with performing any of these procedures, consulting with a mechanic will be the safest course of action.