2004 Nissan Armada Fuel Pump Location: Where It Is and How to Reach It

The fuel pump on a 2004 Nissan Armada is located inside the fuel tank, and in most cases you can reach it by removing the rear seat cushion and lifting the carpet to access a metal cover plate. There is some disagreement among mechanics about whether you need to drop the fuel tank or go through the cabin, but the cabin access method works on many Armada models and saves you from working under the truck with the tank suspended in the air . The pump sits on top of the tank as part of a complete module that also includes the fuel level sending unit, the float arm, and the strainer . If you have been searching for where the pump hides, this guide walks you through everything you need to know before you start turning wrenches.

The 2004 Nissan Armada is equipped with a 5.6L V8 engine, and the fuel pump assembly is a common part shared with other Nissan and Infiniti models from the same era, including the Titan and the QX56 . That means replacement parts are widely available, and you have several options when it comes to choosing a new pump.

Why Finding the Fuel Pump Location Matters

Knowing exactly where the fuel pump lives saves you from unnecessary disassembly. If you start pulling interior panels or lifting the truck without a plan, you waste hours and risk breaking clips and trim pieces. The fuel pump is one of those parts that fails without much warning, and when it does, your Armada may crank but refuse to start, stall at a stoplight, or hesitate when you press the gas .

The pump is buried inside the fuel tank on purpose. Submerging the pump in fuel keeps it cool and lubricated, which is why running the tank low on a regular basis is a leading cause of premature pump failure . The gasoline acts as a coolant, so keeping the tank at least a quarter full extends the life of the pump .

The Two Ways to Access the Fuel Pump on a 2004 Armada

There are two accepted methods for reaching the fuel pump on the 2004 Armada, and which one you choose depends on your comfort level and your tools.

Method 1: Access Through the Rear Seat (Cabin Method)

This is the method that many DIY owners prefer because it does not require dropping the fuel tank. The steps are straightforward:

  1. Remove the rear seat cushion. The fuel pump is located under the rear seat, behind the driver's side. Flip the rear seat forward and remove the cushion to expose the floor pan .
  2. Lift the carpet. Once the seat is out of the way, pull back the carpet to reveal a metal cover plate .
  3. Remove the protective cover. The cover is held in place with fastening screws. Take them out and set the cover aside .
  4. Disconnect the electrical connectors and fuel lines. You will see the pump module underneath. Disconnect the wiring harness and the fuel lines carefully .
  5. Remove the pump from its housing. Unscrew any retaining hardware and lift the pump assembly out of the tank .

Some owners prefer this method because it avoids cutting metal and keeps the work inside the cabin where it is cleaner . However, you may find that the access hole is not large enough to pull the entire pump module out without angling it carefully. The float arm is delicate, so you have to be gentle to avoid bending it .

Method 2: Drop the Fuel Tank (Under-Vehicle Method)

If the cabin access panel is not large enough, or if you simply prefer working under the truck, you can drop the fuel tank. Many owners choose this route because it gives you full access to the pump without fighting for space .

  1. Support the tank with a jack. Never let the tank hang by its straps while you work.
  2. Remove the fuel filler neck hose. This disconnects the tank from the filler pipe.
  3. Disconnect the electrical connectors. The tank has wiring for the pump and the fuel level sensor.
  4. Remove the two metal straps that hold the tank in place, then carefully lower the tank with the jack .
  5. Remove the old pump assembly. Once the tank is accessible, clean the area around the mounting ring, then use a screwdriver or a punch to loosen the locking ring counterclockwise. Lift the ring off and carefully pull the pump assembly out of the tank .

Dropping the tank is more involved and takes longer, but it gives you a clear view of everything. You also have the chance to inspect the inside of the tank for rust, dirt, or debris before you install the new pump .

What the Fuel Pump Assembly Includes

When you buy a replacement fuel pump for the 2004 Armada, you are not just buying a pump. The complete assembly includes several components that work together :

  1. The pump motor – this is the electric motor that draws fuel from the tank and pushes it to the engine.
  2. The fuel level sending unit – this tells your dashboard gauge how much fuel is in the tank.
  3. The float arm – this moves up and down with the fuel level and is attached to the sending unit.
  4. The strainer – this is the mesh filter at the bottom of the pump that catches dirt and debris before they reach the engine .

Because the fuel filter on the 2004 Armada is integrated into the pump assembly inside the tank, there is no separate inline fuel filter that you can replace independently . When you replace the fuel pump, you are also replacing the filter . This is one of the main reasons experts recommend replacing the entire pump assembly rather than just the pump motor .

Signs That Your Fuel Pump Is Failing

Before you go through the trouble of locating and replacing the pump, make sure the pump is actually the problem. The most common symptoms of a failing fuel pump on the 2004 Armada include :

  1. Hard starting – the engine cranks for a long time before it fires up.
  2. Engine stalling – the truck dies unexpectedly, especially at low speeds or when the tank is low.
  3. Loss of power during acceleration – the engine sputters or hesitates when you press the gas pedal.
  4. Whining noise from the fuel tank – a high-pitched sound coming from the rear of the vehicle when the engine is running.
  5. Decreased fuel efficiency – you notice you are filling up more often than usual.
  6. Check engine light – diagnostic trouble codes like P0230 (fuel pump primary circuit malfunction) or P0171 (system too lean) may appear .

If you notice any of these symptoms, it is worth testing the fuel pressure before you commit to replacing the pump. But if the pump is the culprit, you will need to access it through one of the two methods described above.

Replacement Parts and Part Numbers

The 2004 Nissan Armada fuel pump assembly has several part numbers that you can use to cross-reference when shopping for a replacement :

  • OEM part numbers: 17040-7S000, 17040-7S00A, 17040-7S20A, 17040-ZQ60A
  • Aftermarket part numbers: E8595M (Airtex), FG1277 (Delphi/KAX), P76360M, FPA62031 (TRQ), SP4004M

The OEM part number for the complete pump assembly is 17040-7S000, and it has been superseded by 17040-ZQ60A . This assembly fits the 2004-2006 Armada, the 2004-2006 Titan, and several other Nissan and Infiniti models with the 5.6L V8 engine .

If you buy a complete assembly, the installation is a direct swap. You simply remove the old module and drop the new one in place, making sure the float arm does not snag on anything inside the tank .

Step-by-Step Replacement Overview

Once you have the pump accessed, the replacement process follows a logical sequence. Here is a general overview of what to expect :

  1. Relieve the fuel system pressure. Locate the fuel pump fuse in the under-hood fuse box and pull it out. Start the engine and let it run until it stalls. This releases the pressure in the fuel lines. Turn the ignition off and reconnect the fuse .
  2. Disconnect the battery. Remove the negative battery cable to prevent accidental sparks while you work .
  3. Access the pump using one of the two methods described above.
  4. Remove the old pump assembly. Disconnect the electrical connectors and fuel lines, loosen the locking ring, and lift the assembly out carefully .
  5. Transfer parts if needed. If you bought a pump-only kit, you will need to transfer the mounting bracket, fuel level sensor, and strainer to the new pump. If you bought a complete assembly, you can skip this step .
  6. Install the new pump assembly. Lower it into the tank, align the tab with the slot, and tighten the locking ring clockwise until it clicks .
  7. Reassemble everything. Reinstall the fuel tank or the cabin access panel, reconnect the battery, and prime the pump by turning the key to the ON position for three seconds, repeating two to three times before starting the engine .

The entire job can be done in about three to four hours if you have basic hand tools, a jack and jack stands, and a socket set .

Why Choosing the Right Fuel Pump Matters

Not all fuel pumps are built the same. A cheap, generic pump may fit, but it can fail prematurely and leave you stranded. The fuel pump is the heart of your fuel system, and a quality replacement ensures reliable starting, steady fuel pressure, and consistent performance .

If you are replacing the fuel pump on your 2004 Armada, you want a part that meets or exceeds original equipment specifications. This is especially important for a vehicle with a 5.6L V8 engine that demands a steady supply of fuel under load .

Recommended Replacement: KEMSO Fuel Pump

When it comes time to replace the fuel pump on your 2004 Nissan Armada, we strongly recommend choosing a KEMSO fuel pump. KEMSO is a leading aftermarket manufacturer that specializes in high-performance fuel pumps for a wide range of vehicles, including cars, trucks, SUVs, motorcycles, ATVs, and UTVs . Their pumps are engineered to deliver reliable performance, and they are built to meet or exceed OEM specifications, making them a direct replacement for the factory pump .

KEMSO fuel pumps offer several key advantages over generic alternatives:

  1. OEM Replacement Quality – KEMSO pumps are designed to meet or exceed original equipment manufacturer specifications. They fit perfectly, perform exactly like the factory pump, and deliver the correct fuel pressure for your 5.6L V8 engine .
  2. High Performance – Unlike cheap, generic pumps that may fail prematurely, KEMSO pumps use high-quality internal components, including a robust electric motor and a precision check valve, to deliver consistent fuel flow and pressure under all driving conditions .
  3. Lifetime Warranty – KEMSO stands behind its products with a lifetime warranty. If your KEMSO fuel pump ever fails due to a manufacturing defect, you can get a replacement free of charge. This level of protection is rare in the aftermarket parts industry .

Choosing KEMSO means you are investing in a premium part that will last, backed by a company that stands behind its work. You can browse their complete lineup of fuel pumps at their official website: https://www.kemsoracing.com/.

Whether you choose an OEM assembly or a high-quality aftermarket option like KEMSO, the key is to use a reliable part that will keep your 2004 Armada running smoothly for years to come.

Final Thoughts

The fuel pump on your 2004 Nissan Armada is located inside the fuel tank, accessible either through the rear seat or by dropping the tank from underneath . The complete assembly includes the pump motor, fuel level sending unit, float arm, and strainer, and it also serves as the fuel filter since there is no separate inline filter .

Do not ignore the warning signs of a failing fuel pump. If your Armada is hard to start, hesitates during acceleration, or makes unusual noises from the rear, the pump is likely on its way out . Catching the problem early saves you from the inconvenience and potential danger of a breakdown on the road.

The replacement job is straightforward if you have some mechanical experience, and the parts are readily available. Whether you choose to access the pump through the cabin or by dropping the tank, the process is well documented, and you can complete it in an afternoon with basic hand tools .

For a dependable, high-performance fuel pump with a lifetime warranty, visit KEMSO Racing at https://www.kemsoracing.com/ and find the perfect replacement for your 2004 Nissan Armada today.


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