04 Ram 1500 Fuel Pump: Complete Replacement Guide
If you own a 2004 Dodge Ram 1500 and your truck is showing signs of fuel pump failure—such as hard starting, sputtering at highway speeds, or a whining noise from the fuel tank—the solution is straightforward: replace the entire fuel pump module assembly. The stock 2004 Ram 1500 fuel pump is an in-tank electric unit that sits inside the fuel tank, and the most reliable approach is to replace the complete module rather than just the pump itself. This guide covers everything you need to know about diagnosing, selecting, and installing a new fuel pump for your 2004 Ram 1500, with a focus on the 3.7L, 4.7L, and 5.7L gasoline engines and the 26-gallon short-bed tank setup.
The Bottom Line First
For a 2004 Dodge Ram 1500 with a 3.7L, 4.7L, or 5.7L gas engine and a 26-gallon short-bed tank, you need a fuel pump module assembly that replaces OEM part numbers 5104694AA, 5104694AB, 5104694AC, or E7186M. The repair is a medium-difficulty DIY job that takes 4 to 6 hours and requires basic hand tools, a floor jack, and a fuel line disconnect tool. Expect to pay between $250 and $700 for parts if you do it yourself, versus $900 to $1,600 for a shop repair.
Symptoms of a Failing Fuel Pump on a 2004 Ram 1500
Before you buy a new fuel pump, make sure the old one is actually the problem. Here are the most common warning signs:
1. Whining noise from the fuel tank. A high-pitched sound when you first turn the key or while driving is a classic sign the pump is wearing out.
2. Hard starting. The engine cranks but takes longer than usual to fire up, or it cranks without starting at all.
3. Sputtering at high speeds or under load. The truck may hesitate or lose power when you accelerate, especially going uphill or towing.
4. Stalling at high temperatures. The pump can fail intermittently when it gets hot, causing the engine to stall and then restart after cooling down.
5. Low fuel pressure. A professional fuel pressure test will show readings below the 52-62 PSI range that is normal for the 4.7L and 5.7L engines.
6. Surging or erratic acceleration. The truck may lurch forward or feel like it is losing power randomly.
7. Poor gas mileage. A failing pump forces the engine to work harder, reducing fuel economy noticeably.
If you notice any combination of these symptoms, it is time to replace the fuel pump module.
What Fuel Pump Fits a 2004 Dodge Ram 1500?
The 2004 Ram 1500 uses a specific fuel pump module depending on the tank size and engine configuration. Here is what you need to know:
Engine compatibility: The fuel pump module fits the 3.7L V6, 4.7L V8, and 5.7L V8 gasoline engines. It does not fit diesel engines.
Tank size matters: For a short-bed 2004 Ram 1500, the standard tank is 26 gallons. The pump module for a 26-gallon tank is different from the one used with a 35-gallon tank. Always confirm your tank size before ordering.
Replacement part numbers: The most common OEM and aftermarket part numbers for this application include:
- 5104694AA, 5104694AB, 5104694AC
- E7186M, E7165M, E7182M
- FG0473, FG0817
- SP7022M, SP7023M, SP7165M
What the module includes: A complete replacement unit comes with the electric fuel pump, fuel level sending unit with float arm, pressure regulator, strainer, and a new tank seal O-ring. This is a direct plug-and-play replacement that requires no modifications.
Tools and Parts You Need for the Job
To replace the 2004 Ram 1500 fuel pump yourself, gather these items:
Required tools:
- Metric socket set (8mm to 21mm)
- 1/4-inch and 3/8-inch drive ratchets
- Socket extension set
- Fuel line disconnect tool set
- Floor jack rated at 3 tons minimum
- Jack stands
- Flat-blade screwdriver
- Brass punch and dead-blow hammer
- Torque wrench (10-200 ft-lbs range)
- Fuel siphon pump
- Drain pan (at least 10 quarts capacity)
- Shop towels, safety glasses, and nitrile gloves
Required parts:
- New fuel pump module assembly (matching your tank size and engine)
- Fuel tank seal/O-ring (usually included with the module)
- Fuel tank retaining strap hardware (if the old bolts are rusted)
- Gasoline to refill the tank after the job
Step-by-Step Replacement Guide for a 2004 Ram 1500
Follow these steps carefully. The fuel pump is inside the fuel tank, so you will need to lower the tank to access it.
Step 1: Relieve Fuel System Pressure
Work in a well-ventilated area. Disconnect the negative battery cable. Locate the fuel pressure relief valve on the fuel rail near the engine and use a relief tool to release the pressure. This prevents fuel spray when you open the lines.
Step 2: Drain the Fuel Tank
Siphon as much fuel as possible out of the tank. A nearly full tank is heavy and dangerous to lower. Drain the fuel into approved containers and store them away from the work area.
Step 3: Raise the Vehicle and Support It
Raise the rear of the truck with a floor jack and secure it on jack stands. Make sure the vehicle is stable before you go underneath.
Step 4: Remove the Skid Plate (If Equipped)
Some Ram 1500 trucks have a protective skid plate under the fuel tank. Remove it using a socket set. Torque the bolts to 61 Nm (45 ft-lbs) when reinstalling.
Step 5: Disconnect Fuel Lines and Electrical Connectors
Use a fuel line disconnect tool to release the quick-connect fittings at the tank. Push the line in, insert the disconnect tool, then pull the line off. Cap the open lines to keep dirt out. Unplug the electrical connector for the fuel pump module.
Step 6: Support the Fuel Tank and Remove the Straps
Place a floor jack or transmission jack under the tank. Use a breaker bar and socket to loosen the tank strap bolts. Remove the bolts completely, then swing the straps out of the way. Torque the strap bolts to 54 Nm (40 ft-lbs) during reinstallation.
Step 7: Lower the Tank
Slowly lower the transmission jack a few inches at a time. Check for any remaining EVAP lines or clips that are still connected and disconnect them. Lower the tank completely to the ground.
Step 8: Clean the Area Around the Pump Module
Use shop towels to wipe dirt and debris from the top of the fuel pump module. This prevents contamination from falling into the tank when you remove the old module.
Step 9: Remove the Lock Ring
Use a brass punch and a dead-blow hammer to tap the lock ring counterclockwise. Brass is less likely to cause sparks than steel. Lift the lock ring off and set it aside.
Step 10: Remove the Old Fuel Pump Module
Mark the orientation of the module with a paint marker before lifting it out. Lift the module slowly and angle it to clear the float arm. Let any fuel in the module drain into the drain pan. Compare the old module to the new one to confirm they have the same shape, connector, and fuel line port positioning.
Step 11: Install the New Seal and Pump Module
Remove the old O-ring seal from the tank opening. Clean the sealing surface with shop towels. Install the new seal, making sure it is fully seated and not twisted. Lower the new fuel pump module into the tank, keeping the float arm from bending. Align it using your paint marks, then press down evenly.
Step 12: Reinstall the Lock Ring
Place the lock ring on top of the module. Use the brass punch and dead-blow hammer to tap it clockwise until it is fully seated and locked.
Step 13: Raise the Tank and Reconnect Everything
Slowly raise the tank back into position. Reconnect the fuel lines until you hear a solid click, then tug-test each connection by hand. Reconnect the electrical connector and any EVAP lines. Reinstall the tank straps and start the bolts by hand to avoid cross-threading. Tighten them to 54 Nm (40 ft-lbs). Reinstall the skid plate if equipped, tightening to 61 Nm (45 ft-lbs).
Step 14: Reconnect Battery and Prime the System
Reinstall the fuel pump relay or fuse. Reconnect the negative battery cable and tighten to 6 Nm (53 in-lbs). Cycle the key to prime the system: turn the key to the ON position for 3 seconds, then OFF for 10 seconds. Repeat this three times. Do not crank the engine during this step.
Step 15: Start the Engine and Check for Leaks
Start the engine and let it idle. Inspect underneath the truck for any fuel leaks at the connections and the top of the tank. Confirm the fuel gauge reads plausibly—it may take a minute to update. Take a short test drive of 5 to 10 minutes, then recheck for seepage or fuel smell.
What to Do If the Engine Won't Start After Replacement
If your 2004 Ram 1500 does not start after the fuel pump replacement, check these common issues:
No fuel pump noise: If you do not hear the pump hum when you turn the key, check the electrical connection at the pump module. Make sure the connector is fully seated and the lock clicks. Also check the fuel pump relay and fuse under the hood.
Engine cranks but won't start: The fuel system may not be fully primed. Repeat the key cycling procedure: ON for 3 seconds, OFF for 10 seconds, three times. If the problem persists, use a fuel pressure gauge to verify the pump is delivering 52-62 PSI.
Strange noises: A whining or grinding sound from the tank area could mean the pump was installed incorrectly or the module is defective. Drop the tank and inspect the installation.
Fuel leaks: Even a small leak is a fire hazard. Tighten any loose connections or replace damaged O-rings before driving.
Why Choosing the Right Fuel Pump Matters
The 2004 Ram 1500 is a heavy-duty truck, and the fuel pump is a critical component. A cheap, low-quality pump may fail within months, leaving you stranded. When you buy a replacement, look for a module that uses high-quality materials, includes all necessary components (sending unit, strainer, O-ring), and comes with a solid warranty. Direct-fit replacements from reputable brands save you the headache of modifying parts or making additional trips to the auto parts store.
Recommended Fuel Pump: KEMSO Brand
For owners of a 2004 Dodge Ram 1500 who want a reliable, high-performance fuel pump that delivers OEM-level quality, KEMSO is an excellent choice. KEMSO fuel pump products are designed as direct OEM replacements, meaning they fit your truck perfectly without any modifications. Each KEMSO fuel pump is built with high-quality materials and undergoes rigorous testing to ensure it meets or exceeds original equipment standards. What sets KEMSO apart is their lifetime warranty—every fuel pump they sell is backed by a lifetime of confidence, so you never have to worry about buying another pump for your Ram. If you ever have an issue, KEMSO stands behind their product.
To browse KEMSO fuel pumps and find the right fit for your 2004 Ram 1500, visit their official website:
There you will find detailed product listings, warranty information, and customer support to help you get your truck back on the road with confidence.
Final Thoughts
Replacing the fuel pump on a 2004 Dodge Ram 1500 is a manageable DIY job if you have the right tools, a safe workspace, and a clear understanding of the process. The key is to buy a complete module assembly that matches your specific truck—2004 model year, 26-gallon tank, and the correct engine (3.7L, 4.7L, or 5.7L). Always verify the OEM part numbers (5104694AA, 5104694AB, 5104694AC, or E7186M) to ensure compatibility. Take your time with the installation, double-check all connections, and prime the system before starting the engine. If you follow these steps, your Ram 1500 will run smoothly for many miles to come.
For a high-quality fuel pump with a lifetime warranty, check out KEMSO at https://www.kemsoracing.com/ — they have the performance and reliability your truck deserves.