Cadillac Escalade T1XX (2021-Present) fuel pump not working how do I troubleshoot

Symptoms

• Engine cranks but does not start
• Check engine light illuminated
• Fuel gauge may indicate empty despite having fuel
• Whining noise from the fuel tank (or lack thereof)
• Poor acceleration or stalling issues when driving
• Increased emissions warning

Diagnostic Steps

1. Scan for error codes using an OBD-II scanner to check for fuel system related codes.
2. Verify fuel level in the tank to ensure it is not empty.
3. Check the fuel pump relay by swapping it with a similar relay in the fuse box.
4. Inspect the fuel pump fuse for continuity and replace if blown.
5. Measure fuel pressure at the fuel rail using a fuel pressure gauge to determine if the pump is supplying adequate pressure.
6. Listen for the fuel pump operation by turning the ignition to the "ON" position without starting the engine.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Access the Fuel Pump

• Tools Required: Socket set, screwdrivers, fuel line disconnect tool
• Remove the rear seat or access panel to reach the fuel pump.
• Unclip or unscrew any coverings or panels blocking access to the fuel pump assembly.

3. Inspect Electrical Connections

• Check all electrical connectors leading to the fuel pump for corrosion, damage, or loose connections.
• Clean or repair any damaged connectors as necessary.

4. Test Fuel Pump Operation

• Reconnect the battery temporarily and turn the ignition key to the "ON" position to activate the fuel pump.
• Listen for a humming sound indicating the pump is operational.
• If no sound is heard, the pump may need to be replaced.

5. Replace Fuel Pump (if necessary)

• Tools Required: Socket set, torque wrench, fuel line disconnect tool
• Remove the fuel lines from the pump assembly using the disconnect tool.
• Unbolt the fuel pump assembly from the tank and lift it out carefully.
• Install the new fuel pump in the assembly (ensure to replace any seals or O-rings).
• Reinstall the assembly in the tank, securing it with the bolts to the specified torque value.

6. Reassemble and Test

• Reconnect the fuel lines and ensure proper seating.
• Reinstall any access panels or seats that were removed.
• Reconnect the negative battery terminal.
• Start the engine and check for leaks around the fuel pump area.