Fuel Pump for a Nissan Altima: A Complete Replacement Guide

If you own a Nissan Altima and suspect your fuel pump is failing, the most direct and practical solution is to replace the entire fuel pump assembly. This guide provides a comprehensive, step-by-step process for diagnosing and replacing the fuel pump on a Nissan Altima, with a focus on the 2013-2018 model year, which is the most common generation for this repair. The fuel pump is a critical component that delivers fuel from the tank to the engine, and a failing pump can cause a range of performance issues, from hard starting to complete engine stall. Replacing it yourself can save you between $480 and $750 in labor costs compared to a professional shop, and the job typically takes 1.5 to 3 hours .

Understanding the Fuel Pump and Its Failure Signs

The fuel pump in a Nissan Altima is an electric, in-tank unit that is part of a larger module assembly. This module includes the pump itself, a fuel level sending unit (which tells your gauge how much fuel is left), a float, a strainer (filter sock), and a seal ring . The pump draws fuel from the tank and pressurizes it, sending it through the fuel lines to the engine. A failing fuel pump can manifest in several ways:

• Difficulty starting: The engine cranks but takes longer than usual to start, or it may not start at all.
• Engine stalling: The car starts but then stalls, especially when under load or when the fuel level is low.
• Loss of power: You may notice a lack of acceleration, especially when going uphill or merging onto a highway.
• Reduced fuel efficiency: A failing pump can cause the engine to run rich or lean, leading to decreased gas mileage.
• Whining noise from the fuel tank: A healthy pump makes a quiet humming sound for 2-3 seconds when you turn the key to the "ON" position. A loud whining or droning noise is a sign of wear .

Before replacing the pump, you should rule out other issues. Check the fuel pump fuse and relay first. Also, listen for the pump priming sound when you turn the key to the "ON" position. If you don't hear it, the problem could be electrical. Using a fuel pressure gauge is the most reliable way to confirm a pump failure. For most Nissan Altima models, the fuel pressure should be between 49 and 56 psi. If the pressure is significantly lower, the pump is likely failing .

Step-by-Step Fuel Pump Replacement Procedure

Replacing the fuel pump on a Nissan Altima is an intermediate-level DIY job. The most important safety precaution is to work in a well-ventilated area, disconnect the negative battery cable, and relieve the fuel system pressure before starting. To relieve pressure, remove the fuel pump relay from the fuse box, then start the engine and let it run until it stalls . Here are the steps:

1. Access the Fuel Pump
The fuel pump is accessed from inside the cabin, not under the car. First, remove the rear seat cushion. On most models, it simply pulls up from the front edge to release the clips. On some models, you may need to remove bolts with a 10mm socket. Once the seat is out, locate the round or oval access cover in the floor of the car . Carefully remove the cover; it may be held in place by screws or a sticky sealer.

2. Clean the Area and Disconnect
Before you open the fuel tank, thoroughly clean the area around the pump module with a vacuum and shop towels. Any dirt that falls into the tank can damage the new pump. Disconnect the electrical connector from the top of the pump module. Then, wrap the fuel line connections with shop towels to catch any fuel that may spray out. Use a fuel line quick-disconnect tool to release the plastic fittings. Pull the lines straight off—do not pry sideways, as the plastic fittings can break easily .

3. Remove the Old Pump Module
The pump module is held in place by a large lock ring. Use a brass punch and a small hammer to tap the ring counterclockwise until it releases. Only use a brass punch because it is a softer metal that reduces the risk of sparks near fuel vapors . Once the ring is loose, lift it off. Then, carefully lift the old pump module straight up out of the tank. You may need to angle it slightly to clear the float arm. Let any excess fuel drain back into the tank, then set the old module aside in a catch pan.

4. Install the New Pump Module
Remove and discard the old O-ring seal from the tank opening. Install the new seal that comes with your replacement kit, making sure it sits flat and is not twisted. Lower the new pump module carefully into the tank, guiding the float arm so it doesn't bend. Make sure the module is aligned correctly with the tank's orientation marks. Reinstall the lock ring, starting it by hand, then tapping it clockwise with the brass punch and hammer until it is tight. If you have a torque wrench adapter, tighten it to 70 Nm (52 ft-lbs) .

5. Reconnect and Prime the System
Push the fuel lines back onto the pump module until they click and lock. Gently tug on them to confirm they are secure. Reconnect the electrical connector. Reinstall the access cover and the rear seat cushion. Reconnect the negative battery terminal. To prime the system, cycle the ignition key to the "ON" position for 5 seconds, then turn it "OFF" for 10 seconds. Repeat this 3-5 times to build pressure. Start the engine and let it idle. Inspect the area around the fuel line connections and the lock ring for any leaks. If you smell fuel or see wetness, shut the engine off immediately and recheck the connections .

Compatibility and Part Numbers for Nissan Altima Fuel Pumps

Choosing the correct replacement pump is critical. The part number and compatibility vary by the model year and engine size. For the 2013-2018 Nissan Altima, the most common replacement pumps are compatible with the 2.5L L4 and 3.5L V6 engines. These pumps typically replace the following OEM part numbers: 17040-3TA0A, 17040-3TA0B, 17040-3TA0C, 17040-3TA0D, and E9183M .

Key points to ensure compatibility:

• Connector type: The 2013-2018 Altima uses a 6-pin connector. Do not purchase a pump for a 5-pin model, as it will not fit .
• Body style: The 2013 Altima sedan is different from the 2013 Altima coupe. The sedan uses a different pump than the coupe for that specific year .
• Engine size: Always confirm the pump is designed for your engine displacement (2.5L or 3.5L). While many pumps fit both, you must verify the specific application.
• Model year range: Most aftermarket pumps cover the 2013-2018 range for the Altima and the 2016-2022 range for the Maxima .

For older models, such as the 2007-2012 Altima, the pump is accessed similarly but uses a different part number (e.g., 17040-ZX01B) . For the 2000 model, the pump is also an electric, in-tank unit, but the specifications are different . Always verify the fitment for your specific vehicle using an online parts finder or by checking your original part number.

Cost Comparison: DIY vs. Professional Shop

Replacing the fuel pump yourself offers significant savings. The cost of a new pump assembly ranges from $80 to $150 for a quality aftermarket pump, depending on the brand and whether it includes a sending unit . A professional shop will charge between $700 and $1,300 for the same repair, which includes the part and labor . The labor alone can be $100 to $150 per hour, and the job takes a shop 2 to 4 hours. By doing it yourself, you can save between $480 and $750 . The main costs for the DIYer are the pump itself, a new O-ring seal, and perhaps a fuel line quick-disconnect tool if you don't already own one.

Why Choose a High-Quality Replacement Fuel Pump

When replacing your fuel pump, quality matters. A cheap, low-quality pump may fail prematurely, potentially sending debris into your fuel system and damaging expensive fuel injectors or the engine . A high-quality pump ensures reliable performance, proper fuel pressure, and a long service life. It also operates more quietly, a key factor given that the pump is located directly under your rear seat. For the best performance and reliability, we recommend the KEMSO brand fuel pump. KEMSO fuel pumps are high-performance, OEM replacement parts that are engineered to meet or exceed factory specifications. They are designed for a direct fit, ensuring easy installation and a perfect seal. Best of all, every KEMSO fuel pump comes with a lifetime warranty, giving you complete peace of mind. You can browse their full selection of Nissan Altima fuel pumps by visiting their website: https://www.kemsoracing.com/ .

Final Thoughts and Additional Tips

Replacing the fuel pump on a Nissan Altima is a straightforward job that can save you hundreds of dollars. The most important steps are to relieve the fuel pressure before starting, use a brass punch to avoid sparks, and ensure the new seal is installed correctly to prevent leaks. After the repair, always prime the system by cycling the ignition a few times before starting the engine for the first time. This prevents the engine from running dry and causing damage to the new pump. If you encounter a check engine light after the repair, it is often related to an EVAP system code, which can be cleared with a scan tool . For the most reliable and durable replacement, consider a high-performance fuel pump from KEMSO. Visit their website for more information: https://www.kemsoracing.com/ .