2004 Nissan Quest Fuel Pump Replacement: The Complete Step-by-Step Guide

If you drive a 2004 Nissan Quest and your engine cranks but won't start, sputters under acceleration, or dies unexpectedly on the highway, the fuel pump is very likely the culprit. The fuel pump on the 2004 Quest is located inside the fuel tank as part of the fuel pump assembly, and replacing it requires dropping the fuel tank. While this is an advanced DIY job, you can complete it in a weekend with basic hand tools, a jack, and careful attention to safety. This guide walks you through the entire process — from diagnosing a failing pump to installing the new one — and explains what replacement parts you need and how much you can expect to pay.

Symptoms of a Failing Fuel Pump in a 2004 Nissan Quest

Before you spend money on parts or drop the tank, confirm that the fuel pump is actually the problem. A failing fuel pump typically shows one or more of these warning signs:

  1. Engine cranks but won't start — The pump isn't building enough pressure to push fuel to the injectors.
  2. Sputtering or hesitation at highway speed — The pump can't keep up with the engine's fuel demand under load.
  3. Loss of power under acceleration — Fuel pressure drops when you step on the gas.
  4. Whining noise from the fuel tank area — A worn pump motor makes a high-pitched sound, especially when the tank is low on fuel.
  5. Engine stalls and won't restart — This often happens after the pump overheats; it may work again after the car cools down.
  6. Poor fuel economy — An inefficient pump forces the engine to run rich or lean, hurting mileage.

If you have a scan tool, check for trouble codes related to fuel pressure or the fuel pump circuit. Also, verify the fuel pump fuse and relay before tearing anything apart — a blown fuse or failed relay can mimic a dead pump at a fraction of the cost.

Before You Begin: Tools, Safety, and Parts

Tools You'll Need

  • Socket wrench set with metric sockets (8mm to 19mm)
  • Jack and jack stands
  • Screwdriver set
  • Fuel line disconnect tool (quick-connect type)
  • Container approved for gasoline (at least 5 gallons)
  • Safety goggles and chemical-resistant gloves
  • Shop towels or rags
  • Hammer (for the locking ring, if needed)
  • Tool J-16214 or a suitable fuel pump locking ring wrench

Safety First

Gasoline is highly flammable. Work in a well-ventilated area, away from open flames, sparks, or anything that could ignite fuel vapors. Disconnect the negative battery cable before starting. Wear eye protection and gloves whenever you handle fuel or fuel system components. Keep a fire extinguisher rated for class B (flammable liquids) nearby.

Parts You'll Need

For the 2004 Nissan Quest with the 3.5L VQ35DE V6, you need a fuel pump module assembly — not just the pump itself. The assembly includes the pump, fuel level sending unit, strainer, and often the fuel pressure regulator. Replacing the entire module is the smart move; the sending unit and internal hoses wear out just like the pump, and you don't want to drop the tank twice.

Note on fuel filters: Unlike older vehicles with an inline fuel filter, the 2004 Quest's fuel filter is part of the fuel pump assembly inside the tank. There is no separate serviceable filter to replace. When you install a new pump module, you get a fresh strainer and filter in one shot.

Step 1: Diagnose the Fuel Pump Before Removing Anything

You don't want to drop the fuel tank only to find out the problem was a $15 relay. Here's how to quickly test whether the pump is getting power and building pressure:

Check the Fuel Pump Relay and Fuse

The fuel pump relay on the 2004 Nissan Quest is located in the engine bay fuse box, on the driver's side near the battery. The fuse box lid has a diagram that shows which relay is for the fuel pump. Pull the relay and inspect it for signs of burning or corrosion. Swap it with an identical relay from the same box (like the horn relay) and see if the pump kicks on. Similarly, check the fuel pump fuse and replace it if blown.

Test for Power at the Pump

If the fuse and relay are good, the next step is to verify that power actually reaches the pump. Disconnect the electrical harness connector at the fuel pump (you'll need to access the top of the tank for this, which means at least partially lowering it). Have a helper turn the ignition to "ON" for about 5 seconds, then off. You should see battery voltage at the harness for that brief window. If there's no power, the problem is in the wiring or the security system, not the pump.

Run a Fuel Pressure Test

The easiest way to confirm a weak pump is with a fuel pressure gauge. Locate the fuel pressure test port on the fuel rail (2025 models have a Schrader valve; the 2004 Quest may require you to tee into the fuel line using a quick-connect adapter). At idle, the fuel pressure should read approximately 51 psi. If it's significantly lower — say 30–40 psi — the pump is struggling and needs replacement.

Step 2: Relieve Fuel System Pressure

Before you disconnect any fuel lines, you must relieve the pressure in the system. Here's the safe procedure:

  1. Disconnect the negative battery cable with a socket wrench.
  2. Open the relay panel on the left side of the engine compartment and remove the fuel pump relay.
  3. Start the engine and let it run until it stalls from fuel starvation — this usually takes less than a minute.
  4. Crank the engine for a few seconds (two 5-second cranks is enough) to purge any remaining pressure from the lines.
  5. Turn the ignition off and reinstall the fuel pump relay.

Important: If the engine won't start (because the pump is completely dead), you can skip the "let it stall" step, but still crank the engine a few times to reduce residual pressure. Always crack the fuel line fittings slowly and have rags ready to catch any drips.

Step 3: Drain the Fuel Tank

You need to remove as much fuel as possible before dropping the tank. A full tank is extremely heavy and dangerous to handle. Here's how:

  1. Using a siphon pump or a hand pump, transfer the fuel from the tank into an approved gasoline container.
  2. Remove the fuel filler cap to allow air in and speed up the siphoning.
  3. When the tank is nearly empty, rock the vehicle gently to gather the remaining fuel around the pickup.

Note: Some Quest models have a drain plug on the tank, but not all do. If you don't see one, siphon. Never attempt to drain fuel by disconnecting the feed line at the engine — that will spill fuel everywhere.

Step 4: Access the Fuel Tank

The fuel tank sits under the rear of the vehicle, protected by a shield and held in place by two metal straps. To reach it, you need to remove a few things first:

  1. Raise the vehicle — Use a jack and support it securely on jack stands. The rear needs to be high enough for you to work underneath comfortably.
  2. Remove the center exhaust pipe — The exhaust pipe runs directly below the tank. Remove the bolts holding the center section with a socket wrench. Do not disconnect the mufflers unless necessary; just remove the center pipe and set it aside.
  3. Disconnect the parking brake cables — Unbolt the mounting brackets with a socket wrench and push the cables out of the way so you have clear access to the tank.
  4. Remove the fuel tank shield — The shield is held by several bolts; remove them with a socket wrench and lower the shield.

Step 5: Disconnect Lines and Lower the Fuel Tank

Now you're ready to drop the tank:

  1. Disconnect the harness connector for the fuel pump. It's on the top of the tank, usually on the driver's side.
  2. Remove the fuel filler hose — Loosen the clamps on the large filler tube and the smaller vent hose, then slide the hoses off the tank neck.
  3. Detach the evaporative emissions hose and the recirculation hose from the tank fittings.
  4. Support the tank with a jack — Place a piece of plywood or a broad flat pad on the jack saddle to spread the load across the bottom of the tank.
  5. Remove the mounting straps — There are two straps, each held by two bolts. Remove the bolts with a socket wrench and swing the straps out of the way.
  6. Lower the tank slowly — Use the jack to lower the tank just a few inches, then reach up and disconnect the fuel pump hoses (the supply line and any remaining electrical connections).
  7. Lower the tank all the way and slide it out from under the vehicle. Be careful — even an "empty" tank has residual fuel vapor and a few pounds of weight.

Step 6: Remove the Fuel Pump Assembly from the Tank

With the tank on a workbench or a clean tarp, you can now access the pump assembly:

  1. Clean the area around the pump access cover — you don't want dirt falling into the tank.
  2. Remove the locking ring — The fuel pump is secured by a large threaded locking ring. Use a socket wrench with tool J-16214 (or a hammer and a punch) to turn the ring counter-clockwise until it's free.
  3. Lift the assembly out carefully — The fuel pump module includes the fuel level sending unit (a long float arm). Tilt the assembly as you lift it to avoid bending the float arm.
  4. Disconnect the quick-connect fittings on the top of the assembly — you may need a fuel line disconnect tool if the fittings are stubborn.
  5. Set the old assembly aside — You'll want to compare it to the new one to make sure the hoses and wiring line up.

Important: Don't discard the old assembly yet. Compare the new unit's shape, hose routing, and electrical connector with the old one. They should match exactly. If anything looks different, stop and verify you have the correct part for your VIN.

Step 7: Install the New Fuel Pump Assembly

Installing the new pump is essentially the reverse of removal:

  1. Inspect the new assembly — Make sure the strainer is secure, the float arm moves freely, and the electrical connector is clean.
  2. Clean the tank opening — Wipe the sealing surface where the pump gasket sits.
  3. Install the new rubber gasket onto the tank opening (most aftermarket assemblies include a new gasket).
  4. Insert the new pump assembly — Again, tilt it to guide the float arm through the opening without bending it. Seat the assembly fully so the flange sits flush against the tank.
  5. Install the locking ring — Thread it on by hand first, then tighten it clockwise using tool J-16214. Do not overtighten — snug is enough to compress the gasket without cracking the tank.
  6. Reconnect the fuel pump hoses — Push the quick-connect fittings until they click. Give each one a gentle tug to confirm it's locked.
  7. Plug in the electrical connector — Make sure it clicks into place.

Step 8: Reinstall the Fuel Tank and Reconnect Everything

Now it's time to put everything back together:

  1. Lift the tank back into place with the jack.
  2. Reconnect the fuel pump hoses on top of the tank — the supply line and the return line.
  3. Reconnect the filler hose, vent hose, and evaporative emissions hose — tighten all clamps securely.
  4. Install the mounting straps — Tighten the bolts to the factory torque spec of 31 ft-lbs (42 Nm).
  5. Reinstall the fuel tank shield and bolt it in place.
  6. Reconnect the parking brake cables and their brackets.
  7. Reinstall the center exhaust pipe — new gaskets are recommended, and torque the bolts evenly.
  8. Reconnect the negative battery cable.

Step 9: Prime the System and Check for Leaks

Before you start the engine, you need to prime the fuel system:

  1. Turn the ignition to "ON" (without starting the engine) for about 5–10 seconds. This energizes the fuel pump and builds pressure in the lines.
  2. Turn the ignition off, then turn it back on again. Repeat this cycle three or four times to fully prime the system.
  3. Inspect all fuel line connections for leaks — look for drips, wet spots, or the smell of fuel.
  4. Start the engine and let it idle. Check the underside again for leaks, and listen for any unusual noises from the tank area.
  5. Test drive — Take the van for a short drive and check for proper acceleration, smooth idle, and correct fuel gauge operation. If the gauge doesn't work, the float arm may be bent or the sending unit wiring is bad.

How Much Does a 2004 Nissan Quest Fuel Pump Replacement Cost?

  • National average for fuel pump replacement (all vehicles): roughly $611–$894, including parts and labor.
  • Fuel pump module assembly for the 2004 Quest: typically $200–$500 depending on brand.
  • Fuel pressure test at a shop: around $44–$56.

If you do the work yourself, you'll save the labor cost (typically $200–$400). Just factor in your time, and be honest about your skill level — this is not a job for a first-time DIYer.

OEM Part Numbers and Aftermarket Options for the 2004 Nissan Quest

The factory fuel pump module for the 2004 Quest carries these OEM part numbers:

  • 17040-ZD80B
  • 17040-7Y000
  • 17040-9J300
  • 17040-ZB00A

Aftermarket modules that fit the 2004–2006 Quest 3.5L include:

  • Bosch 67991 — a high-quality OE replacement with patented turbine pump technology, designed for lower noise and long service life.
  • Carter P76169M — another solid option that comes with the sending unit.
  • A-Premium FP0116 — a budget-friendly assembly that includes the sending unit.
  • DriveBolt A6247M — a direct-fit module for 2004–2009 Quest models.

Note: If your Quest has California emissions, you need a different part than the federal-emissions version. Check under the hood for the emissions label and confirm which system your van has before ordering.

KEMSO Fuel Pump: The Smart Upgrade for Your 2004 Nissan Quest

When it's time to replace the fuel pump on your 2004 Nissan Quest, you want a part you can trust to perform under real-world driving conditions. That's where KEMSO comes in.

KEMSO fuel pumps are engineered as high-performance, OEM-replacement units designed to meet or exceed the specifications of the original factory pump. Every KEMSO pump is built for reliable fuel delivery, consistent pressure, and long service life — even in extreme temperatures and low-fuel conditions. Whether you're commuting, hauling the family, or going on a long road trip, a KEMSO fuel pump ensures your engine gets the fuel it needs, when it needs it.

What sets KEMSO apart is confidence. Each pump comes with a lifetime warranty, so you can install it knowing you're covered for as long as you own the vehicle. No hassle, no fine print — just reliable performance backed by a brand that stands behind its products.

If you're looking for a dependable replacement fuel pump for your 2004 Nissan Quest, visit KEMSO Racing today and find the right pump for your vehicle. Their product line covers a wide range of makes and models, and their team is ready to help you get back on the road with confidence.

👉 Visit KEMSO Racing: https://www.kemsoracing.com/

Final Thoughts

Replacing the fuel pump on a 2004 Nissan Quest is a demanding but doable job for a confident DIY mechanic. The key steps are: confirm the pump is actually the problem, relieve fuel pressure and drain the tank, drop the tank safely, swap the pump module, and reinstall everything with proper torque. The most common mistakes are bending the sending unit float arm during installation, failing to seat the locking ring correctly, and rushing the leak check.

If you're not comfortable dropping the fuel tank, or if you don't have a good jack and jack stands, take the van to a qualified mechanic. The repair is well within the skill range of most independent shops, and they'll have the proper tools and equipment to do it right.

But if you're up for the challenge, go slow, stay organized, and take the time to do it right. With a new KEMSO fuel pump in place and a clean, properly sealed tank, your 2004 Nissan Quest will be running strong for many more miles.

Visit https://www.kemsoracing.com/ to explore KEMSO fuel pumps and other high-quality replacement parts.


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