FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
What are the signs of a faulty fuel pump in the 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What are the signs of a faulty fuel pump in the 2020 Toyota Highlander?

What are the signs of a faulty fuel pump in the 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
5 min read
884 words

Problem Statement

Learn about the symptoms, diagnostic steps, and repair instructions for a faulty fuel pump in the 2020 Toyota Highlander.

Affected Component
fuel pump

Symptoms

  • •Engine Stalling
  • •Difficulty Starting
  • •Loss of Power
  • •Engine Misfires
  • •Fuel Gauge Reading Incorrectly
  • •Unusual Noises
  • •Poor Fuel Economy

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II Scanner
  • •Multimeter
  • •Fuel Pressure Gauge
  • •Screwdrivers (flat and Phillips)
  • •Wrench set
  • •Safety glasses
  • •Fuel line disconnect tool (if necessary)
  • •Rags or shop towels

Additional Information

Affected Component
fuel pump
Difficulty
medium
Severity
medium
Tools Required
8 items

Related Faults

Loading...

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation
Signs of a Faulty Fuel Pump in the 2020 Toyota Highlander

A failing fuel pump can cause a variety of symptoms that affect the performance and reliability of your 2020 Toyota Highlander. Here are the common signs to look for:

Tools Required
  • OBD-II Scanner
  • Multimeter
  • Fuel Pressure Gauge
  • Screwdrivers (flat and Phillips)
  • Wrench set
  • Safety glasses
  • Fuel line disconnect tool (if necessary)
  • Rags or shop towels
Step-by-Step Diagnostic Process

  1. Check Fuel Level:

    • Ensure the fuel tank has adequate fuel. Sometimes, a low fuel level can mimic fuel pump issues.

  2. Listen for Pump Operation:

    • Turn the ignition to the "ON" position (without starting the engine). Listen for a brief humming sound from the fuel tank, which indicates the pump is operating.

  3. Scan for Diagnostic Trouble Codes (DTCs):

    • Use an OBD-II scanner to check for any stored trouble codes related to fuel delivery or engine performance.

  4. Inspect Fuel Pump Relay and Fuse:

    • Locate the fuel pump relay and fuse in the fuse box. Check for continuity using a multimeter and replace if necessary.

  5. Test Fuel Pressure:

    • Connect a fuel pressure gauge to the fuel rail's Schrader valve. Turn the ignition to the "ON" position to measure the fuel pressure. Compare the reading to the manufacturer's specifications (typically between 50-60 psi for the Highlander).

  6. Check for Electrical Issues:

    • If the pressure is low, check the electrical connections to the fuel pump for corrosion or loose wires. Use a multimeter to test the voltage at the fuel pump connector while the ignition is on.

  7. Inspect the Fuel Filter:

    • A clogged fuel filter can restrict fuel flow. If the filter hasn't been replaced according to maintenance schedules, consider inspecting or replacing it.
Repair Instructions
Replacing the Fuel Pump

If diagnostics indicate a faulty fuel pump, follow these steps for replacement.

Tools Required
  • New fuel pump assembly (specific to the 2020 Toyota Highlander)
  • Fuel-resistant gloves
  • Safety glasses
  • Screwdrivers
  • Wrench set
  • Torque wrench
  • Fuel line disconnect tool
  • Rags or shop towels
Step-by-Step Replacement

  1. Relieve Fuel System Pressure:

    • Remove the fuel pump relay from the fuse box. Start the engine and let it run until it stalls to relieve pressure in the fuel system.

  2. Disconnect the Battery:

    • Disconnect the negative terminal of the battery to avoid any electrical shorts.

  3. Access the Fuel Pump:

    • Remove the rear seat or rear panel to access the fuel pump access cover, typically located above the fuel tank.

  4. Remove the Fuel Pump Access Cover:

    • Unscrew the access cover and carefully lift it off.

  5. Disconnect Fuel Lines:

    • Use a fuel line disconnect tool to detach the fuel lines from the fuel pump assembly. Be prepared for some fuel spillage; use rags to catch any fuel.

  6. Disconnect Electrical Connector:

    • Unplug the electrical connector from the fuel pump.

  7. Remove the Fuel Pump Assembly:

    • Unscrew the retaining ring or bolts securing the pump assembly to the tank. Carefully lift the assembly out of the tank.

  8. Install the New Fuel Pump:

    • Place the new fuel pump assembly into the tank, ensuring it is seated correctly. Reinstall the retaining ring and tighten it according to the torque specifications.

  9. Reconnect Electrical Connector and Fuel Lines:

    • Plug in the electrical connector and reattach the fuel lines securely.

  10. Reinstall Access Cover:

    • Place the access cover back on and secure it with screws.

  11. Reconnect the Battery:

    • Reconnect the negative terminal of the battery.

  12. Test the New Fuel Pump:

    • Reinstall the fuel pump relay. Turn the ignition to the "ON" position to prime the fuel system, and check for leaks. Start the engine and allow it to idle to ensure everything is functioning correctly.

  13. Check Fuel Pressure Again:

    • After installation, use the fuel pressure gauge to verify that the new pump is delivering the correct fuel pressure.

By following these steps, you can effectively diagnose and replace a faulty fuel pump in your 2020 Toyota Highlander, ensuring reliable vehicle operation. If you encounter any difficulties or are unsure about any steps, consulting a professional mechanic is advised.