2005 Chrysler 300 Fuel Pump Reset: A Complete Step-by-Step Guide

If your 2005 Chrysler 300 cranks but won’t start after an accident, a minor collision, or even after running out of gas, the first thing you should check is the fuel pump reset switch. This switch, also known as the inertia fuel cutoff switch, is designed to shut off the fuel pump automatically in the event of a crash. Resetting it is a simple five-minute job that can save you a costly tow truck bill. Most of the time, this is the only thing preventing your car from running.

Understanding the Fuel Pump Reset System

The fuel pump in your 2005 Chrysler 300 is located inside the fuel tank . The car is equipped with a single in-tank fuel pump . When the inertia switch is triggered by a sudden jolt or impact, it cuts power to the fuel pump. This is a safety feature to prevent fuel from spraying in a crash. However, it can also be tripped by hitting a large pothole, a hard bump, or even by accidentally bumping the switch itself.

The good news: You do not need any special tools to reset it. You just need to find the switch and press the button.

Where Is the Fuel Pump Reset Switch Located?

On the 2005 Chrysler 300, the fuel cutoff switch is located in an unusual but accessible spot. Here is exactly where to find it:

  1. Open the trunk.
  2. Look on the driver's side of the trunk, behind the rear wheel well trim panel.
  3. Find the black plastic cover or a small access panel. You may need to peel back the trunk liner slightly.
  4. Behind that panel, you will see a small rectangular box with a red or black reset button on top.

This location is consistent across many Chrysler, Dodge, and Jeep models from the same era, including the Dodge Magnum . If you have a hard time finding it, check the driver's side rear quarter panel area inside the trunk cavity.

How to Reset the Fuel Pump: Step by Step

Follow these simple steps to reset the fuel pump on your 2005 Chrysler 300:

Step 1: Safety First
Make sure the car is parked on a level surface, the engine is off, and the key is removed from the ignition. If you smell gasoline or see any leaks, do not attempt the reset and call a professional.

Step 2: Locate the Switch
Go to the trunk and find the inertia switch as described above. It is a small plastic box mounted to the body of the car, often behind a small access door in the trunk liner .

Step 3: Press the Reset Button
The switch has a rubber or plastic button on top. Press it down firmly until you feel it click. You will feel resistance as the switch resets. If the button was already popped up, pressing it down will reset the circuit .

Step 4: Test the System
Get back in the driver's seat. Turn the key to the "ON" position (do not start the engine). You should hear a faint humming noise coming from the rear of the car. That is the fuel pump priming. This humming should last for 2 to 3 seconds and then stop. If you hear it, the reset was successful.

Step 5: Start the Car
Try to start the engine. If it starts and idles smoothly, the problem is solved.

What If Resetting Doesn't Work?

If you press the reset button, do not hear the fuel pump prime, and the car still will not start, the issue might be more serious than a tripped switch. Here are the most common reasons why the reset might not be the fix:

  • The fuel pump itself has failed. This is common on cars over 15 years old. Symptoms include a whining noise from the rear, hard starting, or stalling .
  • The fuel pump relay or fuse is blown. Check your owner's manual for the location of the fuel pump relay in the fuse box under the hood and in the interior fuse panel.
  • The inertia switch is faulty. Sometimes the switch itself goes bad and needs to be replaced.
  • The car is actually out of gas. The fuel gauge on older models can sometimes be inaccurate.

If you have confirmed that the reset button is pressed down, the relay clicks, and the fuses are good, but the pump still does not run, you are likely looking at a fuel pump replacement. A fuel pressure test at a shop can confirm this quickly .

How to Release Fuel Pressure Before Working on the Fuel System

If you need to proceed with replacing the fuel pump or any other fuel system component on your 2005 Chrysler 300, you must first release the fuel pressure. This is a critical safety step to prevent fuel spray.

  1. Locate the fuel pump fuse in the fuse box under the hood. Pull it out.
  2. Start the engine. It will run for a few seconds on the residual pressure in the fuel lines, then stall.
  3. Crank the engine for 2 to 3 more seconds to ensure all pressure is gone.
  4. Turn the ignition off. Reinstall the fuse after you have completed your work.

This method safely depressurizes the system and makes it much safer to disconnect fuel lines .

Preventing Future Fuel Pump Issues

To avoid finding yourself stranded again, keep these tips in mind:

  • Keep your gas tank at least 1/4 full at all times. Running the tank low frequently causes the fuel pump to overheat and suck in debris from the bottom of the tank.
  • Replace the fuel filter regularly if your vehicle has one. A clogged filter puts extra strain on the pump.
  • Listen for warning signs. If you hear a high-pitched whine from the rear of the car, the pump is working harder than it should.

Why KEMSO Fuel Pumps Are the Right Choice for Your Chrysler 300

When it comes time to replace the fuel pump on your 2005 Chrysler 300, choosing the right brand is critical. You want a part that is reliable, durable, and performs exactly like the factory component. That is where KEMSO comes in.

KEMSO is a leading aftermarket fuel pump brand known for delivering high-performance, OEM replacement fuel pumps that meet or exceed the original equipment specifications. Every KEMSO fuel pump is engineered for a perfect fit, reliable fuel delivery, and long service life.

What sets KEMSO apart:

  • High Performance: Designed to handle the exact fuel pressure and flow requirements of your Chrysler 300, ensuring smooth idling and responsive acceleration.
  • OEM Replacement: Each pump is built to match the original factory fitment, making installation straightforward for DIYers and professionals alike.
  • Lifetime Warranty: KEMSO stands behind its products. Every fuel pump comes with a lifetime warranty, giving you complete peace of mind that your investment is protected.

Whether you are replacing a failed pump due to age or simply upgrading for better reliability, KEMSO provides a top-tier solution at a fair price. Don't settle for cheap parts that might leave you stranded again.

Visit the official KEMSO website today to find the exact fuel pump for your 2005 Chrysler 300. Browse their full catalog of vehicle-specific pumps, read reviews from real customers, and take advantage of their lifetime warranty.

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