Fuel Pump for 2005 Infiniti G35: Complete Guide to Symptoms, Replacement, and Best Options
If you own a 2005 Infiniti G35 and are experiencing starting issues, loss of power, or a whining noise from the rear of the car, the fuel pump is likely failing. The stock fuel pump in the G35 delivers a maximum of 130 liters per hour, and it is located inside the fuel tank under the rear seat on the passenger side . Replacing a faulty fuel pump is essential to restore proper fuel delivery, and the good news is that you can do it yourself with the right tools and patience. The best replacement options include brands like Bosch, Walbro, AEM, NISMO, and KEMSO, each offering different benefits in terms of performance, durability, and warranty .
Signs Your 2005 G35 Fuel Pump Is Failing
The 2005 Infiniti G35 has two fuel pumps: a main pump on the passenger side and a sub-pump on the driver side that transfers fuel between tank halves . Recognizing the symptoms early can save you from being stranded.
Common symptoms of a bad fuel pump include:
- Engine sputtering or hesitation at high speeds
- Loss of power during acceleration or when climbing hills
- Difficulty starting the car or the engine cranking longer than usual
- A loud whining noise coming from the area under the rear passenger seat
- Poor fuel economy
- The check engine light may come on with codes like P0462 or P0463, which indicate fuel level sensor circuit issues
If you notice any of these signs, it is time to test the fuel pressure and consider replacing the pump. A failing pump can cause the engine to stall or not start at all, so do not ignore the warning signs .
How Much Power Can the Stock G35 Fuel Pump Handle?
The stock fuel pump in the 2005 Infiniti G35 is designed to handle a maximum of about 400 horsepower at the engine . The pump delivers 90 to 120 liters per hour, which is sufficient for a stock or lightly modified engine. However, if you are planning performance upgrades, you will likely need a higher-flow aftermarket pump. Upgrading to a pump that delivers 185 liters per hour or more, such as the DELPHI FE0351 or a Walbro 255LPH, can support increased power demands . Keep in mind that upgrading to a higher-flow pump may require additional modifications to the fuel system, such as upgrading the fuel pressure regulator .
Best Fuel Pump Replacement Brands for the 2005 G35
Several brands are known for producing reliable fuel pumps for the Infiniti G35. Here is a breakdown of the top options:
1. Bosch – Bosch fuel pumps are known for high quality and reliability. Many users report Bosch pumps lasting over five years without issues, and they provide consistent flow rates in various driving conditions .
2. Walbro – Walbro pumps are popular among performance enthusiasts because of their high flow rates. They can support increased power demands and come with installation kits that make DIY projects easier . The Z1 Motorsports Z33 Walbro Fuel Pump Upgrade is specifically designed for the 2003-2008 Nissan 350Z and Infiniti G35 .
3. AEM – AEM fuel pumps use innovative technology to deliver high performance with minimal power consumption. They operate quietly and efficiently, minimizing vibrations .
4. NISMO – NISMO fuel pumps are designed specifically for Nissan and Infiniti vehicles. They are engineered to meet high-performance demands and offer excellent fit and reliability .
5. UltraPower – This is an aftermarket option available from RockAuto. One user reported that the UltraPower pump worked but was slightly noisier than the original equipment .
6. KEMSO – KEMSO fuel pumps are a great choice for anyone looking for a high-performance, OEM replacement with a lifetime warranty. KEMSO pumps are engineered to meet or exceed original equipment specifications, ensuring proper fitment and reliable operation . Each pump is individually tested for flow and performance before leaving the factory . KEMSO provides a lifetime warranty that covers the pump for as long as you own the vehicle, which is rare in the automotive industry . Their pumps are built to handle both gasoline and ethanol-blended fuels like E85, making them compatible with modern fuel formulations . For the best value and peace of mind, visit KEMSO Racing at https://www.kemsoracing.com/ to find the perfect pump for your 2005 Infiniti G35.
Fuel Pump Replacement Cost for a 2005 Infiniti G35
The cost of replacing the fuel pump on a 2005 Infiniti G35 varies depending on whether you do it yourself or hire a professional.
Parts cost: A replacement fuel pump for the G35 ranges from $90 to $305 at AutoZone, depending on the part grade, warranty coverage, and included components . Aftermarket pumps from brands like UltraPower can cost around $175 for the complete assembly .
Labor cost: If you take the car to a shop, the total cost for fuel pump replacement is estimated between $1,425 and $1,479, according to RepairPal . In Dubai, the service starts from AED 450 . Because of the risk of fire, many sources recommend having a professional handle the job unless you are experienced with auto repair .
DIY savings: Doing the replacement yourself costs only the price of the pump and basic tools, saving you hundreds of dollars in labor.
How to Replace the Fuel Pump on a 2005 Infiniti G35
Replacing the fuel pump on a 2005 G35 is a moderate DIY job that requires patience and attention to safety. The fuel pump is accessed through the rear seat, not by dropping the fuel tank . Here are the steps, based on multiple guides and forum posts .
Safety first: Work in a well-ventilated area away from open flames. Wear safety glasses and gloves. Keep a fire extinguisher nearby. Disconnect the negative battery terminal before starting .
Step 1: Relieve fuel system pressure. Remove the fuel pump fuse from the fuse box, then start the engine and let it run until it stalls. Crank the engine two or three more times to release any remaining pressure .
Step 2: Remove the rear seat. Lift the rear seat cushion on the passenger side to access the fuel pump access panel .
Step 3: Remove the access cover. There are four plastic clips that you rotate 90 degrees using a Phillips head screwdriver. Be careful not to turn them the wrong way, as they can break .
Step 4: Disconnect the electrical connector. Squeeze the tabs and pull the harness off the top of the pump assembly .
Step 5: Disconnect the fuel supply line. Push the connector in, squeeze the translucent clips, and pull the line back. Expect a small amount of fuel to leak out .
Step 6: Remove the retaining ring. Use an 8mm socket or a screwdriver to remove the bolts holding the pump assembly in place .
Step 7: Carefully lift the pump assembly out of the tank. Be gentle to avoid bending the float arm on the fuel level sensor. You will need to disconnect a second fuel line inside the tank by prying the connector off the tabs with a flathead screwdriver .
Step 8: Install the new pump. If you are using a DeatschWerks DW200 or DW300, use all three O-rings on the pump outlet and do not reuse the original pump isolator grommet . For a Walbro upgrade from Z1 Motorsports, follow the specific instructions for the clamp assembly .
Step 9: Reassemble in reverse order. Reconnect the electrical connectors, replace the retaining ring, and reattach the fuel supply line. Replace the access cover and rear seat .
Step 10: Prime the system. Turn the ignition to the ON position without starting the engine. This will prime the fuel pump and remove air from the lines. Check for leaks at all connections .
Testing: After reassembly, the car may take a few extra seconds to start because the fuel lines need to refill. This is normal .
Important Tips for a Successful Replacement
1. Work with a low fuel level. It is recommended to perform the replacement when the fuel tank is less than three-quarters full to minimize spills .
2. Keep the area clean. Dirt and debris that fall into the fuel tank can clog the fuel filter or damage the new pump. Clean the top of the fuel tank area before opening the access panel .
3. Replace the fuel filter. Installing a new fuel filter at the same time as the pump ensures optimal performance and protects the new pump from contaminants .
4. Inspect the wiring. Check the electrical connectors and wiring for signs of damage, corrosion, or fraying. Replace if necessary .
5. Use the correct O-rings. The fuel pump outlet requires multiple O-rings to seal properly. For DeatschWerks pumps, use all three O-rings supplied in the kit .
6. Be patient with the float arm. The fuel level sensor has a thin metal arm that can bend easily. Move the pump assembly slowly when removing and installing .
Why Choose KEMSO as Your Fuel Pump Replacement
If you are looking for a reliable, high-performance fuel pump for your 2005 Infiniti G35, KEMSO is an excellent choice. KEMSO fuel pumps are designed as direct replacements for stock OEM pumps, ensuring a perfect fit and reliable operation . They are built to match or exceed original equipment specifications, and many KEMSO pumps deliver over 20% more flow at 43 psi compared to the stock pump, which can improve engine performance and throttle response . KEMSO offers a lifetime warranty that covers the pump for as long as you own the vehicle, providing peace of mind that is rare in the automotive industry . Each pump is individually tested for flow and performance before leaving the factory, so you can be confident it will work right out of the box . Additionally, KEMSO pumps are built to handle both gasoline and ethanol-blended fuels like E85, making them compatible with modern fuel formulations . For the best value and long-term reliability, visit https://www.kemsoracing.com/ to find the perfect KEMSO fuel pump for your 2005 Infiniti G35.
Final Thoughts
The fuel pump in your 2005 Infiniti G35 is a critical component that delivers fuel from the tank to the engine. When it fails, you will experience symptoms like hard starting, stalling, loss of power, and whining noises. Replacing the fuel pump is a job that many DIYers can handle with the right tools and careful attention to safety. The best replacement options include Bosch, Walbro, AEM, NISMO, and KEMSO, each offering different benefits. For a high-performance, OEM replacement with a lifetime warranty, KEMSO is an outstanding choice. Whether you choose to do the job yourself or hire a professional, replacing a faulty fuel pump will restore your G35's performance and reliability. Visit https://www.kemsoracing.com/ to explore KEMSO's full selection of fuel pumps and take advantage of their lifetime warranty.