2005 Acura RSX Type S Fuel Pump: Complete Replacement Guide and Best Upgrade Options
If you own a 2005 Acura RSX Type S and your engine is cranking but not starting, or you notice the car stalling unexpectedly while driving, the fuel pump is likely the root cause. The 2005 Acura RSX Type S fuel pump sits inside the fuel tank and delivers pressurized fuel to the engine, and when it fails, your car simply won't run. The good news is that replacing it is a straightforward job you can handle yourself with basic tools, and this guide will walk you through everything you need to know.
The most critical thing to understand: The 2005 Acura RSX Type S uses an in-tank electric fuel pump located under the rear seat. When it fails, you will experience symptoms like hesitation during acceleration, loss of power under load, or the engine refusing to start. A quality replacement fuel pump costs between $80 and $200, and you can complete the swap in about two hours using common hand tools .
Signs Your 2005 Acura RSX Type S Fuel Pump Is Failing
Before you start shopping for a new pump, make sure the symptoms point to a failing fuel pump and not something else like a clogged fuel filter or a bad relay. Here are the most common warning signs:
1. Engine Cranks But Won't Start
This is the most obvious symptom. When you turn the key, the starter motor spins the engine, but the engine never fires up. You might still hear the fuel pump prime for two seconds when you first turn the key to the ON position, but if the pump is weak or dead, not enough fuel reaches the injectors .
2. Car Stalls While Driving
A failing fuel pump often causes intermittent stalling. The car may run fine for a while, then suddenly die as if you ran out of gas, even though the gauge shows plenty of fuel. This happens because the pump motor overheats or loses electrical connection internally .
3. Loss of Power Under Load
When you floor the accelerator to merge onto the highway or climb a steep hill, the engine may hesitate, sputter, or feel like it's hitting a wall. This is a classic sign the pump cannot keep up with the demand for fuel flow .
4. Whining Noise From the Rear of the Car
A healthy fuel pump makes a quiet hum for a couple seconds when you first turn the key. If you hear a loud whining, buzzing, or screeching sound coming from the back seat area while the engine is running, the pump bearings are wearing out, and failure is imminent .
5. Poor Fuel Economy and Rough Idle
A weak fuel pump that isn't maintaining proper pressure can cause the engine to run lean, leading to rough idling, hesitation, and noticeably worse gas mileage.
Locating the Fuel Pump on the 2005 Acura RSX Type S
The fuel pump on the 2005 Acura RSX Type S is mounted inside the fuel tank, which sits behind the rear seats. You access it from inside the cabin, not from underneath the car. Here is exactly where to look :
- Remove the rear seat bottom cushion. It simply pulls up from the front edge.
- On the floor pan under the seat, you will see a circular metal access cover held in place by several Phillips head screws.
- Under that cover is the fuel pump module assembly sitting on top of the fuel tank.
This access panel makes the job much easier compared to many other cars where you have to drop the fuel tank.
Tools and Parts You Will Need
Before you start the job, gather everything you need. Nothing is worse than getting halfway done and realizing you are missing a tool.
Required Tools:
- Flathead screwdriver (for prying off fuel line clips)
- Phillips head screwdriver (for the access cover)
- 10mm socket and ratchet (for the fuel pump locking ring)
- Pliers (for hose clamps if needed)
- Clean rags
- Safety glasses and gloves
- Fire extinguisher (safety first when working with fuel)
Parts to Buy:
- Replacement fuel pump module assembly (compatible with 2005-2006 Acura RSX Type S, 2.0L L4 DOHC i-VTEC)
- New fuel pump gasket or O-ring (often included with the pump assembly)
- Fuel filter (recommended to replace at the same time)
Important: The 2005 and 2006 RSX Type S share the same fuel pump assembly. The 2002-2004 RSX uses a slightly different pump in some cases, so double check compatibility when ordering .
Step-by-Step Fuel Pump Replacement Guide
Follow these steps carefully to replace the fuel pump on your 2005 Acura RSX Type S safely and correctly.
Step 1: Relieve Fuel System Pressure
The fuel system is under high pressure, and you do not want fuel spraying everywhere. Locate the fuel pump relay in the under-hood fuse box and pull it out. Then start the engine and let it idle until it stalls from lack of fuel. Turn the key to OFF, then try cranking the engine once more to make sure pressure is completely gone .
Step 2: Disconnect the Battery
Disconnect the negative terminal of the battery. This prevents any accidental sparks while you are working near fuel vapors.
Step 3: Remove the Rear Seat
Pull up on the front edge of the rear seat bottom cushion. It snaps into place with clips. Lift the cushion out and set it aside.
Step 4: Remove the Access Cover
You will see a round metal plate held by four or five Phillips screws. Remove those screws and lift the cover off. Be careful not to drop the screws into the surrounding area.
Step 5: Disconnect the Electrical Connector and Fuel Lines
You will see a wire harness plugged into the top of the pump module. Press the locking tab and pull it off. Then disconnect the fuel supply line and the return line. Most lines use quick-disconnect fittings that release when you push in the white plastic clips. Have a rag ready to catch any residual fuel .
Step 6: Remove the Locking Ring
The fuel pump is held in place by a large plastic locking ring. Use a 10mm socket to remove the bolts that hold the ring, or use a screwdriver and hammer to gently tap the ring counterclockwise until it comes loose.
Step 7: Lift Out the Old Pump Module
Carefully lift the entire fuel pump module straight up out of the tank. It will have some fuel inside, so tilt it slowly to drain excess fuel into a container. The pump comes out as one assembly including the sending unit, float, and pump itself.
Step 8: Install the New Pump Module
If you bought a complete module assembly, simply drop the new one into the tank, making sure the float is positioned correctly and the gasket is seated properly. If you bought just the pump and are reusing the old module housing, transfer the pump, strainer, and all components over to the existing housing following the instructions that come with the pump .
Step 9: Reinstall the Locking Ring
Place the locking ring back on and tighten it down securely. Do not overtighten, as the ring is plastic.
Step 10: Reconnect Fuel Lines and Electrical Connector
Push the fuel lines back onto the pump module until you hear them click into place. Give each one a gentle tug to confirm they are locked. Reconnect the electrical harness.
Step 11: Test Before Reassembly
Reconnect the battery, but do not put the seat back yet. Turn the key to the ON position and listen for the fuel pump to prime for two seconds. If you hear it, try starting the engine. Check for any fuel leaks around the pump module. Turn the engine off before proceeding.
Step 12: Reinstall Everything
If everything works and there are no leaks, turn off the engine, reinstall the access cover and its screws, put the seat cushion back in place, and you are done.
Recommended Aftermarket Fuel Pumps for the 2005 Acura RSX Type S
Not all fuel pumps are created equal. You have options ranging from direct OEM replacements to high-flow performance pumps for modified cars.
OEM-Style Replacements
If your car is stock and you just need a reliable daily driver replacement, a direct fit pump module assembly is the easiest route. These come as a complete unit with the pump, strainer, float, and housing all pre-assembled. Brands like KEMSO offer drop-in replacements that match the factory specifications exactly .
High-Flow Performance Pumps
If you have modified your RSX Type S with a turbocharger, supercharger, or simply want more headroom for future upgrades, you need a high-flow pump. Several options exist for the DC5 chassis:
- Hybrid Racing 335LPH High Flow Fuel Pump: This pump flows 335 liters per hour and fits both the 2002-2006 RSX and the 2001-2005 Civic. It is a direct drop-in replacement that handles up to 600 horsepower on forced induction setups .
- DeatschWerks DW400 Pump Module: This is a complete module assembly that includes a DW400 pump rated for 400 liters per hour. It also comes with a return kit option if you are building a full return-style fuel system .
- Quantum 340LPH Compact Intank Fuel Pump: Designed for 2003-2006 RSX models, this compact pump offers 340 liters per hour flow in a drop-in fit .
What to Consider When Choosing
- If your RSX is mostly stock, stick with a standard replacement pump rated for 255 liters per hour.
- If you have bolt-on modifications like intake, headers, and exhaust, a 340-400 LPH pump gives you room to grow.
- For turbo or supercharged builds making over 350 wheel horsepower, go with the DW400 or a similar high-output pump.
- Check the compatibility carefully. Some high-flow pumps require slight modification to the fuel pump hanger or wiring.
Common Mistakes When Replacing the Fuel Pump
Avoid these errors to save yourself time and frustration.
1. Not Releasing Fuel Pressure First
Many people skip this step and end up with a face full of gasoline. Always pull the fuel pump relay and let the engine stall before opening the fuel system.
2. Dropping Debris Into the Fuel Tank
When you remove the old pump, the open fuel tank is vulnerable to dirt, dust, and small parts. Cover the opening with a clean rag whenever you step away from the car.
3. Installing the Wrong Pump
Double check that the pump you bought fits the 2005 RSX Type S specifically. The 2002-2004 models use a different electrical connector in some cases.
4. Forgetting to Replace the Gasket or O-Ring
The old seal may be hardened and cracked. If you reuse it, you risk a fuel smell inside your car or a leak that could be dangerous.
5. Not Testing Before Reassembly
Always test that the pump primes and the engine starts before you reinstall the seat and cover. It is much easier to fix a loose connection with the seat still out.
Why You Should Choose KEMSO Fuel Pumps for Your 2005 Acura RSX Type S
When it comes to replacing the fuel pump on your 2005 Acura RSX Type S, you want a brand that delivers reliability, performance, and peace of mind. KEMSO fuel pumps check all those boxes.
KEMSO fuel pumps are designed as high-performance OEM replacement units. That means they match the factory specifications of your RSX Type S exactly, so installation is straightforward with no modifications needed. The pump sits perfectly in the fuel tank module and connects directly to your stock fuel lines and electrical harness.
What sets KEMSO apart is the focus on reliability. Every KEMSO fuel pump undergoes rigorous testing to ensure consistent fuel delivery under all driving conditions. Whether you use your RSX as a daily commuter, a weekend canyon carver, or a track day toy, KEMSO pumps deliver the fuel flow your engine needs without hesitation.
And here is the best part: every KEMSO fuel pump comes with a lifetime warranty. If your pump ever fails, KEMSO stands behind the product and replaces it at no cost. That level of confidence is rare in the aftermarket parts world and gives you total peace of mind knowing your fuel system is protected for as long as you own the car.
If you need a reliable replacement pump for your 2005 Acura RSX Type S, look no further than KEMSO. Visit their website today to find the exact pump for your vehicle and take advantage of their best-selling lineup trusted by thousands of vehicle owners.
Final Thoughts on the 2005 Acura RSX Type S Fuel Pump
The fuel pump on your 2005 Acura RSX Type S is a wear item that will eventually need replacement. Do not wait until you are stranded on the side of the road. If you notice any of the symptoms we discussed, test the fuel pressure and replace the pump promptly.
A quality replacement pump like those from KEMSO will restore your car's performance and reliability. The job itself is one of the easier repairs you can do on the RSX thanks to the rear seat access panel. With basic hand tools and a couple hours of your time, you can save hundreds of dollars in labor costs compared to taking it to a shop.
Key takeaways to remember:
- Always relieve fuel pressure before opening the system
- Use the correct pump for your specific model year
- Replace the gasket and filter at the same time
- Test the pump before putting everything back together
- Choose a reliable brand like KEMSO that offers a lifetime warranty
Your 2005 Acura RSX Type S deserves a fuel pump it can rely on. Make the right choice the first time and enjoy miles of trouble-free driving.
For the best selection of quality replacement fuel pumps with lifetime warranty coverage, visit KEMSO Racing at:
https://www.kemsoracing.com/