2002 Infiniti I35 Fuel Pump: Replacement Guide, Symptoms, and Best Options
Signs Your 2002 Infiniti I35 Fuel Pump Is Failing
A failing fuel pump doesn’t always give you a clear warning, but there are common symptoms that point to trouble. If you notice any of these, it’s time to check your fuel pump.
Difficulty Starting the Engine: When the fuel pump can’t supply enough pressure, the engine may crank longer than usual before starting. In cold weather or after the car has been sitting, this problem often gets worse .
Engine Stalling or Hesitation: A weak fuel pump can cause the engine to stall, especially when you’re accelerating, climbing a hill, or driving at highway speeds. You might feel the car hesitate or surge as if it’s running out of gas, even when the tank is full .
Whining Noise from the Fuel Tank: A healthy fuel pump runs quietly. If you hear a loud whirring or humming sound coming from the rear of the car near the fuel tank, the pump is likely failing. This noise often gets louder as the pump wears out .
Check Engine Light Comes On: The engine control module monitors fuel pressure. If the pump is delivering inconsistent pressure, the check engine light may turn on. A diagnostic scan can confirm if the fuel pump is the cause .
Reduced Fuel Economy: When the fuel pump isn’t working efficiently, the engine may run rich or lean, both of which hurt gas mileage. If you notice a sudden drop in fuel economy, a failing pump could be the culprit .
Complete Engine Failure: If the pump stops working entirely, the car won’t start at all. This is the most obvious sign, but by then you’re already stranded .
2002 Infiniti I35 Fuel Pump Specifications
The 2002 Infiniti I35 uses an in-tank electric fuel pump. It’s located inside the gas tank and is powered by a 12-volt DC motor. The pump delivers fuel at a pressure of 43.5 psi (300 kPa) and has a flow rate of 45 gallons per hour (170 liters per hour) . The factory fuel pump is part of an integrated module that includes the pump, strainer, and sending unit. The pump itself is a turbine-type design, which is quieter and more efficient than older vane-style pumps .
The fuel tank capacity is 18.5 gallons. The pump is accessed through an access panel under the rear seat, which makes replacement easier than in some other vehicles . The original equipment manufacturer (OEM) part number for the 2002 Infiniti I35 fuel pump is 17042-5Y700 for the 3.5L V6 engine, or 17042-2Y904 for the 3.0L V6 engine .
How Much Does a 2002 Infiniti I35 Fuel Pump Replacement Cost?
Prices vary depending on whether you do the work yourself or hire a professional.
DIY Cost: The fuel pump itself costs between $36 and $125 for aftermarket brands like Delphi, Bosch, or TRQ . OEM parts from Infiniti run about $343 . You’ll also need a new gasket or O-ring, which costs around $5 to $15. Total DIY cost: $50 to $300 .
Professional Shop Cost: A mechanic or dealership will charge $130 to $500 for labor, plus parts. The average total for a fuel pump replacement on a 2002 Infiniti I35 is about $325 to $589, though some shops quote as high as $821 .
Mobile Mechanic Cost: Services like YourMechanic or RepairSmith offer mobile replacement. For a 2002 Infiniti I35, the average cost is around $325 to $375, including parts and labor .
How to Replace the Fuel Pump on a 2002 Infiniti I35
Replacing the fuel pump on this car is a moderate DIY job. Expect to spend 1 to 3 hours . Here’s a step-by-step overview.
Step 1: Prepare the Vehicle. Disconnect the negative battery cable to prevent sparks. Run the engine until the fuel tank is as low as possible. Park on a level surface and use wheel chocks. Raise the rear of the car with a jack and secure it on jack stands .
Step 2: Access the Fuel Pump. The fuel pump access panel is under the rear seat. Remove the rear seat cushion by pulling up on the front edge. You’ll see a metal or plastic cover. Remove the screws or bolts holding it in place .
Step 3: Disconnect Electrical and Fuel Lines. Unplug the electrical connector from the top of the fuel pump assembly. Use a fuel line disconnect tool to remove the fuel lines. Be prepared for a small amount of fuel to spill. Have shop rags ready .
Step 4: Remove the Old Pump. Use a hammer and a brass punch or a specialized fuel pump retaining ring tool to loosen the locking ring. Turn it counterclockwise until it’s free. Lift the old fuel pump assembly out of the tank. Tilt it to drain any remaining fuel into a container .
Step 5: Install the New Pump. Transfer the rubber gasket or O-ring to the new pump assembly. Lower the new pump into the tank, making sure it’s oriented correctly. Press down and turn the locking ring clockwise to secure it. Reconnect the fuel lines and electrical connector. Replace the access cover and rear seat .
Step 6: Test the Repair. Reconnect the battery. Turn the key to the "ON" position without starting the engine to let the fuel pump prime. Check for leaks. Then start the engine and let it run for a few minutes. Test drive the car to confirm normal operation .
Parts and Tools You’ll Need
Parts:
- New fuel pump assembly (specific to 2002 Infiniti I35 with 3.5L V6)
- Fuel tank sending unit gasket or O-ring
- Fuel filter (recommended to replace at the same time)
Tools:
- Socket set and wrench set
- Flathead and Phillips screwdrivers
- Fuel line disconnect tool
- Hammer and brass punch or retaining ring tool
- Jack and jack stands
- Wheel chocks
- Safety glasses and gloves
- Shop rags and fuel-resistant container
Common Mistakes to Avoid
Forgetting to Replace the Gasket: The old gasket can leak after reinstallation. Always use a new one .
Not Disconnecting the Battery: Fuel pumps are electrical. A spark near the fuel tank can cause a fire. Always disconnect the battery first .
Using the Wrong Fuel Pump: The 2002 Infiniti I35 comes with either a 3.0L or 3.5L engine. Make sure you buy the correct pump for your engine size. The 3.5L V6 uses part number 17042-5Y700 .
Skipping the Fuel Filter: The fuel filter is cheap and easy to replace. Doing it at the same time prevents debris from clogging the new pump .
Running the Tank Low: After installing a new pump, keep the gas tank at least a quarter full. The fuel helps cool and lubricate the pump, extending its life .
Recommended Fuel Pump Brands for 2002 Infiniti I35
Several aftermarket brands offer reliable fuel pumps for this car. Here are the most popular options.
Bosch 67925: This fuel pump and strainer set costs about $83. It’s a direct fit for the 2002-2004 Infiniti I35 and comes with a strainer. Bosch uses patented turbine pump technology for quiet operation and long life .
Delphi FE0351: This in-tank electric pump is priced around $72 to $87. Delphi is a Tier 1 OEM supplier, meaning they make parts for car manufacturers. The pump is rated for 29 gallons per hour and has a maximum pressure of 85 psi .
Denso 951-0008: Denso is another OEM supplier. The 951-0008 pump costs about $85 to $124. It’s a new electric pump with a blade terminal design .
TRQ FPA62101: This is a budget-friendly option at about $44. It’s a direct replacement electric fuel pump. Customer reviews note it works well in the 2002 Infiniti I35 .
KEMSO Fuel Pump: If you want a high-performance, OEM replacement with a lifetime warranty, consider the KEMSO brand. KEMSO fuel pumps are designed to meet or exceed factory specifications, ensuring reliable fuel delivery and long service life. They are built for durability and come with a lifetime warranty for peace of mind. To browse the full selection of KEMSO fuel pumps for your 2002 Infiniti I35, visit https://www.kemsoracing.com/ .
When to See a Professional
While many DIYers can handle this job, some situations call for a mechanic. If you smell fuel, see smoke, or the engine overheats, stop immediately and seek professional help . Also, if you lack the proper tools or are unsure about any step, it’s better to hire a certified mechanic. Mobile mechanics can come to your home or office and complete the replacement in 1 to 3 hours .
Final Thoughts
The 2002 Infiniti I35 fuel pump is a crucial component that keeps your engine running smoothly. Recognizing the symptoms of failure early—like hard starting, stalling, or whining noises—can save you from being stranded. Replacing the pump yourself is a rewarding project that saves money, but it requires the right tools and a careful approach. Whether you choose an OEM part, a trusted aftermarket brand like Bosch or Delphi, or a high-performance option like KEMSO, make sure the pump is compatible with your 2002 Infiniti I35’s 3.5L V6 engine. For a reliable, long-lasting replacement with a lifetime warranty, check out the KEMSO fuel pump selection at https://www.kemsoracing.com/ .