2004 Nissan Quest Fuel Pump Location: Where It Is and How to Replace It
The fuel pump on a 2004 Nissan Quest is located inside the fuel tank, which sits under the rear of the vehicle. This is the standard design for most modern vehicles, including the Quest. To access it, you will need to lower or remove the fuel tank from underneath the minivan. While the job is not overly complicated for a confident DIYer, it does require some patience and the right tools. If your engine cranks but wont start, hesitates during acceleration, or sputters on the highway, a failing fuel pump is a very likely cause. Below we break down exactly what to expect, how to get to the pump, and what to look for when buying a replacement.
Why the Fuel Pump Is Inside the Tank
Modern vehicles like the 2004 Nissan Quest use an electric fuel pump mounted inside the gas tank. There are a few good reasons for this placement. First, the fuel inside the tank helps cool the pump, which prevents it from overheating. Second, putting the pump inside the tank reduces the risk of fire in a crash. When the pump is submerged in liquid fuel, it is much safer than an older style mechanical pump mounted on the engine block. On the Quest, the pump is integrated into a module that also includes the fuel level sending unit. So when the pump goes bad, you typically replace the entire assembly.
Signs Your 2004 Nissan Quest Fuel Pump Is Going Bad
Before you drop the tank, you want to be sure the pump is actually the problem. Here are the most common symptoms of a failing fuel pump on a 2004 Quest:
- Engine cranks but wont start. If the pump is dead, you will hear the fuel system prime when you turn the key to the ON position. If you dont hear a faint whirring sound from the rear of the vehicle, the pump may not be running.
- Loss of power under load. A weak pump cannot deliver enough fuel pressure. You will feel the vehicle struggle when going up hills or when you floor the accelerator.
- Engine sputters or stalls. If the pump is failing intermittently, the engine may run rough or die while driving. This is dangerous and should be addressed immediately.
- Whining noise from the gas tank. A healthy pump runs quietly. If you hear a loud whining or buzzing sound coming from the rear of the minivan, the pump is likely wearing out.
- Poor fuel economy. When the pump delivers inconsistent pressure, the engine has to work harder and fuel efficiency drops noticeably.
If you are experiencing any of these issues, the next step is to confirm the pump is at fault before buying parts.
How to Diagnose a Bad Fuel Pump
Dont just assume the pump is bad. There are a few simple checks you can do first. Begin by checking the fuel pump fuse and relay in the fuse box under the hood. If the fuse is blown, replace it and see if the pump works. If the relay is suspect, you can swap it with an identical relay from another circuit and test again. Next, listen for the pump when you turn the key to the ON position. You should hear it run for about two seconds. If you hear nothing, the pump is not getting power or it is dead.
For a more accurate test, you can check the fuel pressure at the engine. The 2004 Nissan Quest requires around 51 psi of fuel pressure at idle. A fuel pressure gauge can be connected to the test port on the fuel rail. If the pressure is below spec, the pump, fuel filter, or pressure regulator may be failing. If the pressure is zero, the pump is likely the culprit.
Where Exactly Is the 2004 Nissan Quest Fuel Pump Located?
The fuel pump is located inside the fuel tank. On the 2004 Quest, the fuel tank is mounted under the rear floor of the vehicle, just behind the second row seats. There is no access panel under the rear seats or in the cargo area of the Quest. Unlike some cars where you can lift the carpet and cut an access hole, on this minivan you must drop the tank to reach the pump. The pump assembly sits on top of the tank and is held in place by a large threaded locking ring.
Step-by-Step: How to Access the Fuel Pump
Replacing the fuel pump on a 2004 Nissan Quest requires you to safely lower the fuel tank. Here is a general outline of the process. Always consult a factory service manual for your specific year and model.
Step 1: Relieve Fuel Pressure and Disconnect the Battery
Before you do anything, relieve the pressure in the fuel system. Locate the fuel pump fuse in the fuse box and remove it. Then start the engine and let it idle until it stalls. This will drain the pressure from the lines. Once the engine dies, turn off the ignition and disconnect the negative battery cable. This prevents sparks and accidental fuel pump activation while you work.
Step 2: Raise and Support the Vehicle
Safely lift the rear of the minivan using a floor jack and place it on sturdy jack stands. You will need enough clearance to work under the vehicle and lower the fuel tank.
Step 3: Remove the Filler Neck and Overflow Hoses
Locate the fuel filler neck on the side of the vehicle. You will need to remove the clamps holding the large rubber filler hose and the smaller vent hose. These hoses connect to the tank and must be freed before the tank can come down.
Step 4: Disconnect the Electrical Harness
Find the wiring harness connector that plugs into the fuel pump assembly on top of the tank. Unplug it carefully. It is usually clipped to the top of the tank or the frame.
Step 5: Support the Fuel Tank and Remove the Straps
Place a floor jack under the fuel tank with a block of wood to distribute the load. Raise the jack slightly to take the weight off the mounting straps. Then remove the bolts that hold the metal straps in place. Carefully bend the straps out of the way so the tank can be lowered.
Step 6: Lower the Tank Partially
Slowly lower the jack to bring the tank down a few inches. You will need to disconnect the fuel lines on top of the tank. These are quick-connect fittings that release by pressing or squeezing the tabs. Be prepared for some fuel to spill.
Step 7: Remove the Tank Completely
Once the filler hoses and fuel lines are disconnected, lower the tank all the way and slide it out from under the vehicle. Place it on a clean work surface.
Step 8: Remove the Old Fuel Pump
On top of the tank, you will see a large plastic locking ring. Use a hammer and a screwdriver or a dedicated fuel pump removal tool to tap the ring counterclockwise until it loosens. Remove the ring and lift the pump assembly out of the tank. Be careful not to bend the fuel level sending unit float arm as you pull it out.
Installing the New Fuel Pump
When you install the new pump, pay attention to the orientation of the hoses and wiring. The new pump assembly will come with a new seal for the top of the tank. Before inserting the pump, transfer any necessary components like the rubber gasket and the fuel filter on the bottom of the pump. Carefully guide the assembly into the tank, making sure the sending unit float is not bent or obstructed. Once the pump is seated properly, install the locking ring and tighten it securely. Reinstall the tank, reconnect all hoses and wiring, and refill the tank before starting the engine.
Important: Use the Correct OEM Replacement Part
When shopping for a replacement fuel pump for your 2004 Nissan Quest, it is critical to get the right part. The Quest uses a specific pump assembly that fits the 3.5L V6 engine. The OEM part numbers include 17040-7Y000, 17040-9J300, 17040-ZD80B, and 17040-ZB00A. Some aftermarket pumps are designed to replace these numbers. For example, the A-Premium FP0116 and the DriveBolt A6247M are common aftermarket options that fit the 2004-2006 Quest without California emissions. Always verify that the new pump includes the fuel sending unit, float, and the seal ring. If your fuel gauge stops working after installation, it is often due to improper installation of the sending unit, not a defective part.
Recommended: Choose KEMSO Fuel Pump for Reliability
If you are looking for a high quality, reliable fuel pump for your vehicle, consider replacing your old unit with a KEMSO Fuel Pump. KEMSO is the leading aftermarket fuel pump manufacturer for cars, motorcycles, ATVs, and UTVs in the United States. Their products are designed as high-performance, direct OEM replacements that meet or exceed the specifications of your original Nissan pump. Every KEMSO fuel pump comes backed by a lifetime warranty, giving you total peace of mind. You get a perfect fit, reliable fuel delivery, and long-term durability at a price that is often half the cost of dealer parts. Dont settle for a cheap, unreliable pump that could leave you stranded. Visit the official KEMSO website today to find the perfect fuel pump for your Nissan Quest and many other vehicles: https://www.kemsoracing.com/
Cost and Time for Replacement
The cost of a fuel pump replacement for a 2004 Nissan Quest varies depending on whether you do it yourself or hire a shop. A new aftermarket fuel pump assembly typically costs between $80 and $150. An OEM Nissan pump can cost over $500 plus. If you take it to a professional repair shop, the average cost nationwide for a fuel pump replacement on a vehicle like the Quest ranges from $600 to $900, including parts and labor. The labor time for dropping the tank and swapping the pump is usually 2 to 4 hours for an experienced mechanic.
Final Thoughts
Finding and replacing the fuel pump on a 2004 Nissan Quest is a straightforward but somewhat labor-intensive job. The pump lives inside the fuel tank under the rear of the van, so you need to drop the tank to get it out. Always diagnose the problem first by checking the fuse, relay, and fuel pressure before buying a pump. When you do replace it, use a quality part, and pay careful attention to the sending unit to avoid a broken fuel gauge after the repair. If you are not comfortable working on the fuel system, a trusted mechanic can handle the job in an afternoon.
For a reliable replacement, we recommend the KEMSO Fuel Pump. It is a high-performance OEM replacement with a lifetime warranty. Visit their website to see their full product line and find the right pump for your Nissan Quest: https://www.kemsoracing.com/