2006 Chrysler 300 Fuel Pump Wiring Diagram: A Complete Owner's Guide
If you own a 2006 Chrysler 300 and your engine cranks but won't start, the fuel pump wiring system is one of the first places you should look. The fuel pump on this model is powered through fuse number 6 (a 20-amp fuse) located in the Rear Power Distribution Center, which sits in the trunk under the spare tire access panel. When that fuse checks out fine but the pump still doesn't run, the problem often traces back to a wiring fault between the fuse box and the pump connector, or a faulty relay in the same panel. Understanding how this circuit is laid out, what each wire does, and how to test it with a simple multimeter can save you both time and money at the shop.
Where the Fuel Pump Lives and How Power Reaches It
The 2006 Chrysler 300 has a single electric fuel pump mounted inside the fuel tank. That pump draws fuel from the bottom of the tank and pushes it under pressure through the fuel lines to the engine. The pump itself is part of a larger assembly called the fuel pump module, which also includes the fuel level sending unit (the float that tells your gauge how much fuel you have). On this generation of the 300, commonly referred to as the LX platform, you access the pump by removing the rear seat cushion, then opening a small access door cut into the floor pan. You do not need to drop the fuel tank for most servicing, which is good news for DIY owners.
Power for the fuel pump flows from the battery through the Rear Power Distribution Center, which is located in the trunk on the passenger side, under the carpet and next to the battery. From there, the circuit runs through the fuel pump relay and then out to the pump itself. The fuse that protects this circuit is fuse number 6, rated at 20 amps. Some sources also reference fuse 15 in the same rear panel for certain trim levels, but the factory service information for the 2006 model consistently points to cavity 6 for the fuel pump circuit.
The fuel pump relay, which is also in the rear power distribution center, acts as a switch. When you turn the key to the RUN position, the Powertrain Control Module (PCM) energizes the relay coil, which then closes the contacts and sends battery voltage to the pump. That is why you should hear a brief whirring sound from the rear of the car for about two seconds when you first turn the key on, even before you crank the engine. If you hear nothing, the pump may not be getting power, or the pump itself may have failed.
Reading the Wiring Diagram: What Each Wire Does
The fuel pump wiring on the 2006 Chrysler 300 is straightforward, but it helps to know exactly what each conductor is responsible for. The pump electrical connector is a five-pin connector, and the two thickest wires carry the main power and ground for the pump motor. On the connector, pin number 5 is the power feed from the fuel pump relay, and the wire color is typically dark blue with an orange stripe. That is the hot wire that should show battery voltage (around 12 volts) when the relay is energized. The ground side is usually a black wire, and it ties into a chassis ground point under the rear seat area or in the trunk.
The remaining pins on the connector are for the fuel level sending unit. Those wires carry a variable resistance signal back to the instrument cluster, and they are not involved in running the pump motor itself. If your fuel gauge is working but the pump is dead, you can isolate the problem to the power side of the circuit. If the gauge also reads empty all the time, the sending unit may be damaged, and you might be looking at replacing the entire fuel pump module assembly.
A quick way to confirm the pump is getting power is to listen for it. Have a helper turn the ignition key to the ON position while you stand near the fuel tank. If you hear a low hum for a couple of seconds, the pump is running. If not, move to the next step and check voltage at the fuse and at the relay.
How to Test the Fuel Pump Circuit Safely
Testing the fuel pump circuit on a 2006 Chrysler 300 does not require special equipment beyond a digital multimeter. Before you start, park the car on a level surface, set the parking brake, and remove the key from the ignition. The fuel system holds pressure even with the engine off, so you should relieve that pressure before disconnecting any fuel lines. One common method is to pull the fuel pump relay from the rear fuse panel, then crank the engine for a few seconds to bleed the pressure down. The engine will crank but not start, and that is fine.
Once the pressure is relieved, you can begin testing. Start with the simplest checks first:
1. Check the fuel pump fuse. Open the power distribution center in the trunk by lifting the access panel. Locate fuse number 6, rated at 20 amps. Pull it out and look at the metal strip inside. If the strip is broken or discolored, replace the fuse with a new one of the same rating. Never use a higher-amp fuse, because that can overload the wiring and cause a fire. If the fuse is good but the pump still does not run, move on.
2. Check for voltage at the fuel pump connector. Remove the rear seat cushion by pulling up firmly on the front edge of each side. You will see an access door in the floor. Pop the cover off and disconnect the electrical connector from the pump assembly. Set your multimeter to DC volts, put the black lead on a good chassis ground, and touch the red lead to pin number 5 (the dark blue/orange wire). Have a helper turn the key to the ON position. You should see battery voltage for a couple of seconds. If you do, then the wiring up to the pump is fine, and the problem is either the pump motor itself or the ground circuit.
3. Check the ground side. With the same setup, move the black lead of your meter to the black ground wire on the pump connector, and leave the red lead on the power pin. If you still read about 12 volts, the ground is good. A reading of zero suggests an open ground wire, which would prevent the pump from running even with power present.
4. Check the relay. If the fuse is good but there is no voltage at the pump connector, the relay may be at fault. With the key ON, you should hear or feel the relay click. If not, you can swap the fuel pump relay with a known-good relay of the same part number in the rear panel. Many owners have found that simply swapping relays resolves the issue temporarily, but if the problem comes back, the relay itself is likely worn out.
Common Wiring Problems and What They Mean
Several wiring issues show up frequently on 2006 Chrysler 300 models. One of the most common is a corroded or loose connection at the fuel pump connector itself. Water and road salt can creep into the trunk area and attack the terminals, especially if the car has spent a lot of time in northern states. If you pull the connector and see green crust or dark discoloration on the pins, clean them with electrical contact cleaner and a small wire brush. If the terminals are badly pitted, replacement of the connector pigtail may be necessary.
Another common problem is a broken ground wire under the rear seat. The ground point can corrode over time, which raises resistance and reduces the voltage reaching the pump. A poor ground often shows up as a pump that runs weakly, makes a whining noise, or cuts out under load. Checking the ground connection and cleaning it with a wire brush and dielectric grease can restore normal operation.
A less common but more serious issue is a short circuit in the wiring harness between the rear fuse panel and the fuel pump. Chafing against the body sheet metal can wear through the insulation and cause the wire to ground out, which usually blows the fuse immediately. If you keep blowing fuse number 6, inspect the harness along its path from the trunk to the fuel tank area. Look for pinch points, sharp edges, or signs of rubbing.
When the Wiring Is Fine: Testing the Pump Itself
If you have confirmed that power and ground are reaching the fuel pump connector, and the fuse and relay are both good, the pump motor itself may be dead. On the 2006 Chrysler 300, you can do a quick bench test by applying battery voltage directly to the pump connector. Use a fused jumper wire from the positive battery terminal to pin number 5, and a separate jumper from the negative terminal to the ground pin. If the pump does not hum or move fuel, it is time to replace it.
Replacing the fuel pump module is a job most DIY owners can handle in about two hours. You will need a 10mm wrench, a flat-blade screwdriver, a punch or chisel, a hammer, and a clean rag. After relieving fuel pressure and disconnecting the battery, remove the rear seat cushion and the access cover. Disconnect the electrical connector and the fuel lines, then use the punch and hammer to rotate the lock ring counterclockwise. Lift the old pump assembly out carefully, transfer any mounting hardware to the new unit, and install it in reverse order. Always use a new O-ring and torque the lock ring back into place securely.
Why Choose a KEMSO Fuel Pump for Your Chrysler 300
When it comes time to replace the fuel pump on your 2006 Chrysler 300, the quality of the part you choose matters. A weak or poorly made pump can leave you stranded on the side of the road, and it can also put extra strain on the wiring and relay. That is why we recommend looking at the KEMSO brand of fuel pumps. KEMSO builds high-performance fuel pumps that are designed as OEM replacements, meaning they match the factory specifications for fit, flow rate, and pressure. They are built to handle the demands of daily driving, and every unit comes backed by a lifetime warranty. When you choose KEMSO, you are getting a reliable part that installs just like the original, so you can get your Chrysler 300 back on the road with confidence. To see the full lineup of KEMSO fuel pumps and find the exact match for your vehicle, visit their website at https://www.kemsoracing.com/.
Final Thoughts on the 2006 Chrysler 300 Fuel Pump Wiring Diagram
Understanding the fuel pump wiring on your 2006 Chrysler 300 is not as complicated as it might seem. The circuit runs from the rear fuse panel in the trunk, through a 20-amp fuse and a relay, then to a single connector on top of the fuel tank. By checking the fuse first, then verifying power and ground at the pump connector, you can quickly narrow down whether the problem is electrical or mechanical. If the wiring checks out and the pump is dead, a replacement from a trusted brand like KEMSO will get you back on the road. With the fuel pump fuse in cavity 6 of the rear power distribution center and a straightforward testing process, most owners can diagnose and fix this issue in an afternoon without needing a professional mechanic. Remember to always work safely, relieve fuel pressure before disconnecting anything, and use a multimeter rather than guessing. And if you are in the market for a new fuel pump, be sure to check out the KEMSO product line at https://www.kemsoracing.com/ for a high-performance, OEM-replacement option backed by a lifetime warranty.