how to check if my Toyota Highlander Third Generation (2014-2019) fuel pump is working

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, basic hand tools (socket set, screwdrivers).
• Safety Warnings: Disconnect the negative battery terminal before working on electrical systems. Relieve fuel system pressure before disconnecting fuel lines.

2. Remove Fuel Pump Access Panel

• Locate the fuel pump access panel under the rear seat or in the trunk area.
• Use a socket set to remove the screws securing the panel.
• Carefully lift the panel to expose the fuel pump assembly.

3. Check Electrical Connections

• Inspect the electrical connectors for the fuel pump assembly.
• Use a multimeter to check for voltage at the connector while the ignition is in the "ON" position.
• If voltage is present but the pump does not operate, the pump may need replacement.

4. Test Fuel Pump Functionality

• Disconnect the fuel lines from the pump assembly.
• Use a jumper wire to connect the fuel pump directly to the battery to test if it runs.
• If the pump activates, the issue may lie in the wiring or relay; if it does not, the pump likely needs replacement.

5. Reassemble Components

• Reconnect any fuel lines and electrical connectors securely.
• Replace the access panel and secure it with screws.
• Reconnect the negative battery terminal.