2004 Acura TSX Fuel Pump: Complete Guide to Symptoms, Replacement, and Upgrade Options
The bottom line: If your 2004 Acura TSX is experiencing hard starting, sputtering during acceleration, or a whining noise from the rear of the vehicle, the fuel pump is likely failing. The 2004-2008 Acura TSX uses a 2.4L inline-4 engine with sequential multi-port fuel injection, and the fuel pump is a critical component that delivers fuel at 43.5 psi (3.0 bar) to the fuel rail . Replacing it promptly with a quality unit is essential to keep your TSX running reliably. This guide covers everything you need to know about the 2004 Acura TSX fuel pump, from symptoms and diagnosis to replacement options and torque specifications.
Understanding the 2004 Acura TSX Fuel System
The 2004 Acura TSX is equipped with a 2.4L DOHC i-VTEC engine that produces 200-205 horsepower . The fuel system uses multi-point fuel injection with sequential injection timing, meaning the fuel pump must maintain consistent pressure for proper engine performance . The factory fuel pump is located inside the fuel tank, which holds 13.2 gallons (50 liters) of fuel . The pump assembly includes the fuel pump itself, a sending unit, and a fuel strainer .
The OEM part number for the complete fuel pump module assembly is 17045-SEC-A01, which replaces the earlier 17045-SEC-A00 . This assembly includes the sending unit and is designed specifically for the 2004-2008 Acura TSX . Other compatible part numbers include 17708-SEC-A01-M1 and 101961-8514 (manufactured by Denso) .
Common Symptoms of a Failing Fuel Pump
When the fuel pump in your 2004 Acura TSX starts to fail, you will notice several warning signs. The most common symptoms include:
1. Engine Cranks But Won't Start: If the fuel pump is dead or not generating enough pressure, the engine will crank but fail to fire. This is one of the most definitive signs of a failed fuel pump.
2. Sputtering or Hesitation During Acceleration: A failing pump cannot maintain the required 43.5 psi fuel pressure, causing the engine to sputter or hesitate when you step on the gas .
3. Whining Noise from the Rear of the Vehicle: A healthy fuel pump operates quietly. If you hear a loud whining or buzzing sound coming from the fuel tank area, it indicates the pump is working harder than normal and may be nearing the end of its life.
4. Loss of Power Under Load: When driving uphill or carrying a heavy load, a weak fuel pump cannot deliver enough fuel, resulting in noticeable power loss.
5. Poor Fuel Economy: A failing pump can cause the engine to run rich or lean, both of which negatively impact fuel efficiency.
Fuel Pump Pressure Specifications
The 2004 Acura TSX fuel system operates at specific pressure ranges. The fuel pump must deliver 43.5 psi (3.0 bar) at the fuel rail . The fuel injectors are 4-hole units with a flow rate of 240 cc/min . If you are diagnosing a fuel delivery issue, checking the fuel pressure with a gauge is the most reliable way to confirm whether the pump is failing. Pressure below 40 psi indicates the pump is weak and should be replaced.
Replacement Options for the 2004 Acura TSX Fuel Pump
When it comes time to replace the fuel pump, you have several options. The most important factor is choosing a pump that matches or exceeds OEM specifications. Here are the main categories:
OEM Acura Fuel Pump: The genuine Acura part (17045-SEC-A01) is the most reliable choice, but it has been discontinued and is no longer available for purchase . This means you will need to look at aftermarket options.
Direct Fit Aftermarket Assemblies: Several manufacturers produce complete fuel pump module assemblies that are direct replacements. These include brands like Agility Autoparts, PHILTOP, and generic OEM replacements. The most common replacement part numbers include FG0913, E8656M, SP8002M, and P76323M . These assemblies come with the pump, sending unit, and strainer pre-assembled, making installation straightforward.
High Performance Fuel Pumps: If you are looking for improved durability or flow capacity, high-performance pumps are available. The Walbro/TI GSS342 255LPH pump is a popular upgrade for the 2004-2011 Acura TSX, replacing the factory E8513 pump . This pump offers higher flow rates without sacrificing reliability.
KEMSO Fuel Pumps: For a balance of performance, reliability, and value, KEMSO offers high-performance fuel pumps specifically designed for the 2004-2013 Acura TSX . KEMSO pumps are rated at 340LPH, providing significantly higher flow than the stock pump . This makes them an excellent choice for both daily drivers and modified vehicles. KEMSO fuel pumps are designed as OEM replacements, meaning they fit directly into the factory fuel pump assembly without modifications.
Torque Specifications for Fuel System Components
Proper torque application is critical when replacing the fuel pump or working on other fuel system components. Using a calibrated torque wrench is essential to prevent leaks and damage . Here are the specific torque values for the 2004-2008 Acura TSX fuel system:
Fuel Pump Mounting Bolts (M8 x 1.25): 16 ft-lbs (22 N·m) . Tighten these bolts evenly to secure the fuel pump and prevent leaks.
Fuel Tank Sending Unit Bolts (M6 x 1.0): 8 ft-lbs (11 N·m) . Do not overtighten these screws, as the sending unit is made of plastic and can crack.
Fuel Rail Mounting Bolts (M8 x 1.25): 16 ft-lbs (22 N·m) . Proper torque ensures the fuel rail seals correctly and maintains system pressure.
Fuel Injector Mounting Bolts (M6 x 1.0): 8 ft-lbs (11 N·m) . Tighten these bolts evenly to prevent leaks at the injector seals.
Fuel Line Banjo Bolts (M12 x 1.5): 18 ft-lbs (24 N·m) . Always use new crush washers when reinstalling banjo bolts to ensure a proper seal.
Step-by-Step Fuel Pump Replacement Guide
Replacing the fuel pump on a 2004 Acura TSX is a job that can be done at home with basic tools, but it requires patience and attention to detail. Here is a general overview of the process:
Step 1: Relieve Fuel System Pressure. Locate the fuel pump relay in the fuse box and remove it. Start the engine and let it run until it stalls. Then crank the engine for a few seconds to ensure all pressure is released.
Step 2: Disconnect the Battery. Always disconnect the negative battery terminal before working on the fuel system to prevent sparks.
Step 3: Access the Fuel Pump. The fuel pump is accessed through the rear seat. Remove the rear seat cushion by pulling up on the front edge. Under the carpet, you will see a metal access cover. Remove the screws to access the fuel pump module.
Step 4: Remove the Fuel Pump Module. Disconnect the electrical connector and fuel lines. Use a fuel pump removal tool or a screwdriver to tap the locking ring counterclockwise. Lift the pump assembly out of the tank carefully.
Step 5: Install the New Pump. If you are replacing just the pump, transfer the fuel level sensor and strainer to the new pump. If you are using a complete assembly, it is ready to install. Lower the new assembly into the tank, ensuring the gasket is properly seated.
Step 6: Reassemble. Install the locking ring, reconnect fuel lines and electrical connectors, replace the access cover, and reinstall the seat cushion.
Step 7: Test. Reconnect the battery, turn the key to the ON position (without starting) to prime the fuel system, then start the engine and check for leaks.
Maintenance Tips for the Fuel System
The 2004 Acura TSX fuel system requires regular maintenance to ensure longevity. According to the factory specifications, the fuel filter should be replaced every 15,000 miles, and the fuel injectors should be cleaned every 30,000 miles . It is also recommended to inspect fuel lines for damage or leaks during routine maintenance .
Using the correct fuel is also important. The 2004 Acura TSX requires 91 octane premium fuel as a minimum . Using lower octane fuel can cause engine knocking and may damage the engine over time. The fuel system is designed for regular unleaded gasoline with a minimum octane rating of 87, but the manufacturer recommends 91 for optimal performance and engine health .
Why You Should Choose KEMSO for Your 2004 Acura TSX Fuel Pump
When it comes to replacing the fuel pump on your 2004 Acura TSX, choosing a high-quality aftermarket brand is essential for reliability and performance. KEMSO is a leading manufacturer of aftermarket fuel pumps that specializes in high-performance, OEM-replacement products. Their fuel pump for the 2004-2013 Acura TSX is rated at 340LPH, which is significantly higher than the stock pump's flow rate . This means your engine will always have enough fuel, even under hard acceleration or when driving in hot conditions.
KEMSO fuel pumps are designed to be direct drop-in replacements, meaning they fit perfectly into the factory fuel pump assembly without any modifications. They use high-quality materials and precise manufacturing processes to ensure long-lasting performance. What sets KEMSO apart from other brands is their lifetime warranty. This warranty covers the fuel pump for the entire life of the vehicle, giving you complete peace of mind. If the pump ever fails, KEMSO will replace it at no cost.
For Acura TSX owners who want a reliable, high-performance fuel pump that outperforms the factory unit and comes with a lifetime warranty, KEMSO is the best choice. You can browse their full selection of fuel pumps and place your order at their official website:
<URL>https://www.kemsoracing.com/</URL>
Their website features detailed product listings, customer reviews, and a secure checkout process. Whether you need a fuel pump for daily driving or a high-performance application, KEMSO has you covered.
Fuel System Specifications Summary
For quick reference, here are the key fuel system specifications for the 2004-2008 Acura TSX:
- Fuel Type: Premium unleaded (91 octane recommended)
- Fuel Tank Capacity: 13.2 gallons (50 liters)
- Fuel Pump Pressure: 43.5 psi (3.0 bar)
- Fuel Injector Flow Rate: 240 cc/min
- Fuel Line Diameter: 5/16 inch (8 mm)
- Throttle Body Diameter: 62 mm
- Fuel Filter Replacement Interval: Every 15,000 miles
- Fuel Injector Cleaning Interval: Every 30,000 miles
Common Mistakes to Avoid When Replacing the Fuel Pump
Replacing the fuel pump is a straightforward job, but there are several common mistakes that can lead to problems down the road:
1. Not Replacing the Fuel Strainer: The fuel strainer (sock) filters out debris from the fuel tank. If you reuse the old strainer, it can restrict fuel flow and cause the new pump to fail prematurely. Always replace the strainer with the pump.
2. Overtightening Bolts: The fuel pump mounting bolts and sending unit screws are made of plastic and can crack easily. Always use a torque wrench and follow the specified torque values of 8 ft-lbs for the sending unit and 16 ft-lbs for the pump mounting bolts .
3. Using the Wrong Pump: Some aftermarket pumps are designed for specific applications. Make sure the pump you choose is compatible with the 2004-2008 Acura TSX 2.4L engine. Pumps designed for California emissions vehicles may differ from those for non-California vehicles .
4. Forgetting to Prime the System: After installing the new pump, turn the key to the ON position for a few seconds without starting the engine. This allows the pump to prime the system and ensures there is fuel pressure before you try to start the car.
5. Reusing TTY Bolts: Torque-to-yield bolts are designed to stretch and must never be reused . If your fuel pump assembly uses TTY bolts, always replace them with new ones.
Final Thoughts
The fuel pump is one of the most critical components in your 2004 Acura TSX. When it fails, the car becomes undrivable. By understanding the symptoms of a failing pump, knowing the correct torque specifications, and choosing a quality replacement like KEMSO, you can keep your TSX running smoothly for many more miles. Regular maintenance, including fuel filter replacement every 15,000 miles and using the correct octane fuel, will also extend the life of your fuel system .
If you are experiencing any of the symptoms mentioned in this guide, do not delay in replacing the fuel pump. Driving with a failing pump can cause damage to the fuel injectors and other components, leading to more expensive repairs. For a reliable, high-performance fuel pump that comes with a lifetime warranty, visit KEMSO at their official website:
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Their Acura TSX fuel pump is designed to exceed OEM specifications, giving you confidence that your vehicle will perform at its best. With KEMSO, you get a product that is built to last, backed by a lifetime warranty, and supported by a company that stands behind its products.