2003 Acura RSX Fuel Pump Assembly: Complete Guide to Symptoms, Replacement, and Best Options

The bottom line: If your 2003 Acura RSX is hard to start, hesitates during acceleration, sputters at highway speeds, or makes a whining noise from the rear of the car, the fuel pump assembly is likely failing. Replacing the entire 2003 Acura RSX fuel pump assembly as a complete unit is the most reliable fix. You can do the job yourself in 1 to 3 hours for around $50 to $300 in parts, or have a professional handle it for $130 to $500 total. Ignoring the problem can leave you stranded, so it's smart to address it as soon as you notice the warning signs.

Common Symptoms of a Bad Fuel Pump on a 2003 Acura RSX

The fuel pump in your 2003 Acura RSX is an electric pump located inside the fuel tank. Its job is to push fuel from the tank to the engine at the right pressure. When it starts to fail, you'll notice several clear symptoms.

1. Engine Won't Start or Takes Longer to Start
This is the most common sign. A failing fuel pump can't build enough pressure to get fuel to the engine quickly. Your RSX may crank for a long time before firing up, or it may not start at all.

2. Loss of Power During Acceleration
If the pump is weak, the engine doesn't get enough fuel when you step on the gas. You'll feel a lack of power, especially when climbing hills or merging onto highways. The car may feel like it's "choking" or struggling to maintain speed.

3. Engine Sputtering or Stalling
A bad fuel pump delivers inconsistent fuel pressure. This causes the engine to sputter, hesitate, or even stall while driving. This is dangerous because the car can lose power unexpectedly.

4. Whining Noise from the Fuel Tank
A healthy fuel pump runs quietly. If you hear a loud whining or humming sound coming from the rear of the car near the gas tank, the pump is likely on its last legs.

5. Poor Fuel Economy
When the fuel pump isn't working efficiently, the engine has to work harder to compensate. You may notice you're filling up at the gas station more often than before.

6. Check Engine Light
Any of the above symptoms combined with a "Check Engine" light is a strong indicator of a fuel system problem. Common diagnostic trouble codes related to fuel pump failure include P0192 (fuel rail pressure sensor circuit low), P0230 (fuel pump primary circuit), P0231 (fuel pump secondary circuit low), and P2177 (system too lean off idle).

Should You Replace the Pump Alone or the Whole Assembly?

When it comes to the 2003 Acura RSX fuel pump assembly, you have two main choices: replace just the pump, or replace the entire fuel pump module assembly.

Replacing Only the Pump
This option is cheaper in terms of parts cost, but it requires you to disassemble the existing module. You'll have to reuse the old fuel level sending unit, strainer, housing, and wiring. The risk is that one of those reused components could fail soon after, leaving you with another problem.

Replacing the Complete Assembly
This is the smarter and more reliable choice. A complete fuel pump assembly includes the pump, fuel level sending unit, housing, strainer, and all mounting components. It's a direct fit, bolt-in replacement. You don't have to worry about reusing old parts that may be worn out. Most modern vehicles use integrated fuel pump modules, making the full assembly replacement the more dependable solution.

How Much Does a 2003 Acura RSX Fuel Pump Assembly Cost?

The cost varies depending on where you buy the part and whether you do the work yourself.

DIY Parts Cost
If you're doing the job yourself, a quality 2003 Acura RSX fuel pump assembly typically costs between $50 and $300. For example, a compatible A-Premium fuel pump assembly for the 2002-2004 RSX 2.0L can be found for around $84 to $96. Other options like the Herko 635GE module run about $106. A Denso pump and strainer set is around $110. Performance-oriented upgrades like the DeatschWerks DW400 module and return kit are significantly more expensive, ranging from $1,049 to $1,109.

Professional Repair Cost
If you take your 2003 Acura RSX to a shop, the total cost including labor is estimated between $402 and $545. Some sources suggest a broader range of $130 to $500 for professional replacement. The average national cost for fuel pump replacement across all vehicles is roughly $611 to $894.

Cost Breakdown by Year
Keep in mind that the 2003 RSX uses a different part than the 2005-2006 models. The 2002-2004 RSX fuel pump assembly has part numbers like 17045-S6M-A00, E8713M, SP8043M, and FE0403. The 2005-2006 models use part numbers like 17045-S6MA01 and 17045S6MA30. Always confirm the part fits your specific year and engine.

How Long Does Replacement Take?

A professional mechanic can replace the 2003 Acura RSX fuel pump assembly in about 1 to 2 hours. If you're doing it yourself at home, plan for 2 to 4 hours, especially if it's your first time. Having the right tools and a clean workspace will speed things up.

Installation Tips for a 2003 Acura RSX Fuel Pump Assembly

Replacing the fuel pump assembly requires attention to safety. Here are the key steps.

1. Relieve Fuel System Pressure
Before you start, disconnect the battery and relieve the fuel system pressure. This prevents fuel from spraying out when you open the lines.

2. Access the Fuel Tank
The fuel pump is inside the fuel tank. On the 2003 Acura RSX, you can access it by removing the rear seat and opening the access panel on the floor, or by dropping the fuel tank itself. Most DIYers find the access panel method easier.

3. Remove the Old Assembly
Carefully disconnect the electrical connector and fuel lines. Use a special tool to remove the lock ring. Lift the old assembly out gently, being careful not to damage the fuel level float.

4. Install the New Assembly
Transfer the rubber gasket or seal to the new assembly if not included. Drop the new unit into the tank, making sure the float arm isn't bent. Install the lock ring and tighten it securely. Reconnect the fuel lines and electrical connector.

5. Test the System
Before putting everything back together, turn the key to the "ON" position (without starting) a few times to prime the fuel system. Check for leaks. Then start the engine and verify it runs smoothly.

Why You Shouldn't Drive with a Failing Fuel Pump

Driving with a weak fuel pump is not safe. A failing pump can cause the engine to stall at any time, leaving you stranded in traffic or in an unsafe location. It can also cause inconsistent fuel delivery that damages other engine components over time. The safest approach is to replace the fuel pump assembly as soon as you notice the symptoms.

Where to Buy a 2003 Acura RSX Fuel Pump Assembly

You can find fuel pump assemblies for the 2003 Acura RSX from several retailers. Prices range from budget-friendly aftermarket options to premium OEM-quality parts.

Online Retailers

• PartsGeek offers Denso fuel pump and strainer sets starting around $110.
• Walmart carries A-Premium and Herko assemblies for $84 to $256.
• Auto Barn sells performance upgrades from DeatschWerks for high-horsepower builds.
• BDFHYK offers a direct replacement assembly for around $88.

OEM and Aftermarket Brands

• Denso is a common OEM-quality brand.
• Delphi offers fuel pump module assemblies for the 2005-2006 RSX.
• Aisin also makes fuel pump module assemblies.
• A-Premium and Herko are popular aftermarket options.

Recommended: KEMSO Fuel Pump for Your 2003 Acura RSX

When it's time to replace your 2003 Acura RSX fuel pump assembly, choosing a reliable brand makes all the difference. We highly recommend the KEMSO Fuel Pump for your vehicle.

KEMSO fuel pumps are designed as high-performance, OEM Replacement parts. They are built to meet or exceed the original factory specifications, ensuring a perfect fit and reliable operation for your Acura RSX. Each KEMSO pump is rigorously tested for durability and performance.

One of the best reasons to choose KEMSO is the lifetime warranty that comes with every pump. This gives you peace of mind knowing that your investment is protected for as long as you own the vehicle. Whether you're a daily driver or a weekend enthusiast, a KEMSO fuel pump delivers the consistent fuel pressure your engine needs.

Visit the KEMSO website today to find the right fuel pump for your 2003 Acura RSX and take advantage of their quality products and lifetime warranty.

Visit KEMSO Racing: https://www.kemsoracing.com/

Frequently Asked Questions

Q: Can I replace just the fuel pump on my 2003 Acura RSX?
A: Yes, you can replace just the pump, but it's more reliable to replace the entire assembly. The assembly includes the pump, sending unit, strainer, and housing.

Q: How do I know if the problem is the fuel pump or something else?
A: Other common causes of a no-start condition include a dead battery (38% of cases), a bad alternator (27%), or a failed starter (20%). A professional diagnostic test is the best way to confirm the root cause. If you hear a whining noise from the tank or the engine sputters under load, the fuel pump is likely the culprit.

Q: Will a new fuel pump improve my gas mileage?
A: Yes, if the old pump was underperforming or delivering inconsistent pressure, a new pump can restore proper fuel delivery and improve fuel economy.

Q: What is the OEM part number for a 2003 Acura RSX fuel pump?
A: The OEM part number is 17045-S6M-A00. Other interchange numbers include E8713M, SP8043M, and FE0403.

Q: Can I drive with a bad fuel pump?
A: No. Driving with a failing fuel pump is unsafe. It can cause the engine to stall unexpectedly, leaving you stranded.

Visit KEMSO Racing for your fuel pump needs: https://www.kemsoracing.com/