Replacing The Fuel Pump In Your Chrysler 300: Step-By-Step Guide

The fuel pump in your Chrysler 300 is critical to the storing and delivering of fuel that the engine requires to run. If your car begins to jolt following acceleration and then continues with regular performance, it may be time to check the condition of your fuel pump. To replace the fuel pump, you can start by pulling the fuse for the pump in the trunk, then removing the back seat base. Using a pump removal tool or a brass drift, you can then knock it loose, unplug it, and pull it out.

Pull the fuse for the pump in the trunk

To pull the fuse for the pump in the trunk of your Chrysler 300, first locate the fuse box. For the Chrysler 300 models produced from 2005 to 2019, the fuse box is located in the trunk under the spare tire access panel.

Once you have located the fuse box, you will need to identify the correct fuse for the pump. The pump fuse for the Chrysler 300 is typically labelled as "Power Outlet Trunk" or "Power Outlet Inside Arm Rest". For the 2005-2010 models, the pump fuse is №16 or №38, while for the 2011-2019 models, it is №38.

After identifying the correct fuse, you can then proceed to pull it out of the fuse box. This will disconnect power to the pump and allow you to safely work on removing or replacing the pump.

It is important to note that working with any electrical components in your vehicle can be dangerous if not done properly. Always exercise caution and refer to a professional or a repair manual if you are unsure about any part of the process.

Pull the back seat base

To pull the back seat base of your Chrysler 300, start by pulling the fuse for the pump in the trunk. The fuse will be in the ring behind the driver's seat. Once you've pulled the fuse, you can move on to pulling the back seat base.

Pull the bottom of the back seat straight up. It should come up pretty easily, but if you need to, you can use a pump removal tool or a brass drift to knock it loose (never use steel on steel where fuel fumes are present). Once the seat base is loose, simply unplug it and pull it out.

It's important to note that you should always take the proper safety precautions when working on your car, especially when dealing with fuel pumps. Make sure to consult a professional mechanic if you're unsure about anything or if you encounter any problems during the process.

Knock the ring behind the driver's seat loose

To knock the ring behind the driver's seat loose, you will need to use a pump removal tool or a brass drift. It is important to never use steel on steel where fuel fumes are present. Once you have knocked the ring loose, you can unplug and pull out the pump.

Before knocking the ring loose, you should first pull the fuse for the pump in the trunk. Then, pull the back seat base. The ring is located behind the driver's seat.

If you are experiencing issues with your fuel pump, there are a few things you can check. First, make sure to verify that the input wires at the fuel pump connector are intact. There are five wires in total, but only two of them are relevant to the fuel pump operation. These are the thickest wires in diameter: dark blue/orange (pin 5) and black/orange (pin 4).

The black/orange wire is the ground circuit, which grounds at G120 underneath the driver's seat. Ground should be present at all times. If it is not, locate and repair the open wire or poor ground connection.

The dark blue/orange wire is the power feed from the fuel pump relay. It should have power when the key is initially cycled on and while cranking. If it doesn't, check the fuel pump relay in the front power distribution center. If the relay is serviceable, you can swap it with another relay in the box with identical numbers to test for proper operation. If the relay is non-serviceable, you will need to inspect the input wires with a digital multimeter to identify the issue.

Check the input wires at the fuel pump connector

To check the input wires at the fuel pump connector of your Chrysler 300, you'll need to identify the wires and understand their functions. Here's a detailed guide:

First, locate the fuel pump connector. It should be accessible by pulling up the bottom of the back seat of your Chrysler 300. Once you have located the connector, you will see five wires in total. However, three of these wires are for the fuel level sensor, which does not affect the fuel pump operation.

The two wires that require your attention are the thickest in diameter: the dark blue/orange wire (pin 5) and the black/orange wire (pin 4). These wires play crucial roles in the fuel pump's operation. The black/orange wire serves as the ground circuit, grounding at G120 underneath the driver's seat. This wire should have ground present at all times. If it doesn't, you'll need to locate and repair any issues with the open wire or poor ground connection.

The dark blue/orange wire is responsible for delivering power to the fuel pump relay. When you turn the key, this wire should have power, both initially and while cranking. If it doesn't, further inspection is necessary.

To troubleshoot issues with the dark blue/orange wire, you should start by checking the fuel pump relay in the front power distribution center. If it's a serviceable-type relay, you can try swapping it with another relay in the box with identical numbers to test its functionality. If the relay is non-serviceable (integrated into the distribution center), you'll need to inspect the relay input wires with a digital multimeter to pinpoint the issue.

If there's no power at the red/white wire (terminal 54A), you should check fuse 28 (25A) in the power distribution center. Similarly, if there's no power at the pink/light green wire (terminal 54C), you should inspect fuse 37 (10A).

In the case where there's no power on the brown wire (terminal 54D), the issue may lie with the powertrain control module (PCM). This scenario warrants further investigation to determine why the PCM is not commanding the pump to turn on.

Lastly, if all the power circuits mentioned above are functioning correctly and there is power at the dark blue/orange wire (terminal 54B), then the issue is likely an open circuit in this wire between the fuel pump relay and the fuel pump itself.

Inspect the wires for power

To inspect the wires for power, you will need to locate the fuel pump connector. Here, you will find five wires in total, but only two of them are relevant to the fuel pump operation. These are the thickest wires in diameter: dark blue/orange (pin 5) and black/orange (pin 4).

The black/orange wire is the ground circuit, which grounds at G120 underneath the driver's seat. This wire should have ground present at all times. If it doesn't, you will need to locate and repair the open wire or poor ground connection.

The dark blue/orange wire is the power feed from the fuel pump relay and should have power when the key is initially cycled on and while cranking. If it doesn't, the fuel pump relay in the front power distribution center should be checked. If the relay is serviceable, it can be temporarily swapped with another relay in the box with identical numbers to check for proper operation. On the other hand, if the relay is non-serviceable (integrated into the distribution center), the relay input wires will need to be inspected with a digital multimeter to verify if the issue is with the input to the relay or the relay/distribution center itself.

If there is no power at the red/white wire (terminal 54A), check fuse 28 (25A) in the power distribution center. If there is no power at the pink/light green wire (terminal 54C), check fuse 37 (10A). If there is no power on the brown wire (terminal 54D), it indicates that the powertrain control module (PCM) is not commanding the pump on and further investigation is needed.

Finally, if all the power circuits are functioning properly and there is power at the dark blue/orange wire (terminal 54B), then there is an open circuit in the dark blue/orange wire between the fuel pump relay and the fuel pump.

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