How to replace a fuel pump in a Dodge Charger.

Understanding the Fuel Pump and Its Role

Replacing the fuel pump in your Dodge Charger is a significant repair, but it’s a task you can tackle with the right preparation and knowledge. The fuel pump is the heart of your Charger’s fuel system. Its job is to draw gasoline from the tank and deliver it under high pressure to the fuel injectors, which then spray it into the engine’s cylinders for combustion. When it fails, the engine can’t run. Symptoms of a failing pump include engine sputtering at high speeds, loss of power under stress (like going up a hill), a noticeable whining noise from the fuel tank, and, most commonly, the car cranking but not starting. Before you condemn the pump, it’s crucial to verify it’s the culprit. Check the fuel pump relay and fuse first—these are much simpler and cheaper fixes. You can also perform a fuel pressure test using a gauge that connects to the fuel rail’s Schrader valve (it looks like a tire valve). For most modern Hemi V8 Chargers, you should see a pressure reading between 51 and 58 PSI with the key in the “ON” position (engine off). A reading significantly lower than this, or zero, points to a pump issue.

Gathering the Necessary Tools and Parts

Success in this job is 90% preparation. You’ll need a specific set of tools and, most importantly, the correct replacement part. Using a cheap, low-quality pump is a surefire way to end up doing the job again soon. It’s worth investing in a reliable unit from a reputable manufacturer. For a direct, high-quality replacement, consider a Fuel Pump designed specifically for your Charger’s model year and engine.

Tool List:

• Socket set (Metric and SAE, typically ¼” and ½” drive)
• Fuel line disconnect tools (The specific size is often ⅜” and ⅝” for quick-connect fittings)
• Jack and Jack stands (or a vehicle lift if available)
• Drain pan (at least 5-gallon capacity)
• Shop towels or rags
• New fuel tank strap bolts (highly recommended, as old ones can corrode)
• Safety glasses and nitrile gloves

Part List:

• New fuel pump module assembly
• New fuel filter (if not integrated into the pump module)
• New fuel tank gasket or O-ring (almost always included with a new pump)

Safety First: Depressurizing and Draining the System

Gasoline is extremely flammable. The single most important step before you touch any fuel line is to depressurize the system. Locate the fuel pump relay in the Power Distribution Center (PDC) under the hood. The PDC lid has a diagram identifying each relay. Pull the fuel pump relay out, then start the engine. It will run for a few seconds until the remaining fuel pressure in the lines is exhausted and then stall. Crank the engine for another 2-3 seconds to ensure all pressure is gone. Disconnect the negative battery cable for added safety.

Now, you need to address the fuel in the tank. The Charger’s fuel tank is located ahead of the rear axle. The safest approach is to siphon or pump out as much fuel as possible through the filler neck until the tank is as empty as you can get it. Attempting to lower a full or half-full tank is dangerously heavy and can damage the lines. A full 18-gallon tank weighs over 100 pounds just from the fuel.

Step-by-Step Removal of the Old Fuel Pump

With the vehicle safely raised and supported on jack stands, you can begin the disassembly process.

Step 1: Disconnect Fuel Lines and Electrical Connector. You’ll see several lines running to the top of the fuel tank. The electrical connector unplugs by pressing a tab. The fuel lines require a special disconnect tool. Insert the correct-sized tool into the space between the line and the pump module’s nipple, push it in firmly, and then pull the line off. Have a rag ready for any residual fuel drip.

Step 2: Support the Tank and Remove Straps. Place a transmission jack or a sturdy piece of wood on a floor jack under the fuel tank to support it. The tank is held by two straps. Use a penetrating oil like PB Blaster on the strap bolt threads a half-hour before you try to remove them; they are notorious for rusting. Unscrew the bolts and carefully lower the jack just enough to create working space above the tank.

Step 3: Remove the Pump Lockring. The fuel pump is accessed through a hatch on top of the tank. It’s held in place by a large plastic lockring. This ring can be stubborn. Use a blunt chisel and a hammer, tapping gently on the notches of the ring in a counter-clockwise direction to break it free. Do not use a screwdriver and hammer, as this can crack the ring or the tank. Once loose, you can unscrew it by hand.

Step 4: Extract the Pump Module. Carefully lift the pump assembly out of the tank. Be mindful of the float arm for the fuel level sensor, as it can bend easily. Tip the assembly to the side to drain any remaining fuel back into the tank. Take note of the orientation of the assembly and the alignment marks so you can install the new one correctly.

Installation of the New Fuel Pump Assembly

This is where precision matters. A small mistake can lead to a fuel leak.

Step 1: Prepare the New Assembly. Compare the old and new pumps side-by-side to ensure they are identical. Transfer the vapor vent tube from the old assembly to the new one if necessary. Install the new rubber gasket or O-ring onto the fuel tank opening. Lightly lubricate it with a smear of fresh gasoline or silicone grease to help it seal properly. Do not use petroleum jelly or oil.

Step 2: Lower the New Pump into the Tank. Carefully guide the new pump module into the tank, ensuring the float arm isn’t bent and that the alignment tabs are properly seated. It should drop into place smoothly.

Step 3: Secure the Lockring. Hand-tighten the new lockring (if provided) or the old one if it’s in good condition. Then, use your hammer and blunt chisel to tap it clockwise until it is snug. Do not overtighten; you just need to compress the gasket evenly.

Step 4: Reinstall the Tank and Reconnect Everything. Raise the tank back into position with the jack. Reinstall the tank straps with new bolts if possible, torquing them to the manufacturer’s specification (typically between 35-45 ft-lbs). Reconnect the electrical connector and the fuel lines, listening for a definitive “click” as each line snaps into place. Reconnect the negative battery cable.

Final Checks and First Start

You’re almost there. Before adding a large amount of fuel, it’s wise to do a preliminary check. Add a couple of gallons of gas to the tank. Turn the ignition key to the “ON” position (but do not start the engine) for a few seconds, then turn it off. Repeat this 2-3 times. This allows the new pump to prime the system and build pressure. Listen for the pump’s humming sound from the rear of the car; it should run for about two seconds each time you turn the key to “ON.” Now, visually inspect all your connection points for any signs of leaks. If everything is dry, you can proceed to start the engine. It may crank for a few extra seconds as the final air is purged from the lines. Once it starts, let it idle and double-check for leaks one last time.