1990 Acura Integra Fuel Pump Location: The Complete Guide to Finding and Replacing It

The fuel pump on a 1990 Acura Integra is located inside the fuel tank. This is the most important fact you need to know before starting any repair work. Unlike some newer models that allow access through the rear seat, the 1990 Integra requires you to drop the fuel tank from underneath the vehicle to reach the pump assembly. This job is considered medium difficulty and typically takes 2 to 4 hours for a DIY mechanic.

Why the 1990 Integra Is Different

Many people assume the fuel pump is easy to access because later model Integras (1994 and newer) have a service panel under the rear seat. But the 1990 model is built differently. The fuel pump sits inside the tank near the filler neck, on the far corner of the tank. This design makes it a more involved job compared to newer generations.

The fuel sending unit (which tells you how much gas you have) is located under the rear seat, but the actual fuel pump is not. This is a common point of confusion. Some online forums have people arguing about this, but the correct answer for the 1990 model is that the tank must be dropped.

Signs Your Fuel Pump Is Failing

Before you go through the work of replacing the pump, make sure the pump is actually the problem. Here are the most common symptoms of a failing fuel pump on a 1990 Acura Integra:

  1. Engine cranks but won't start – This is the most obvious sign. You turn the key, the starter spins, but the engine never fires up.
  2. Engine sputters at highway speeds – The car runs fine around town but loses power or hesitates when you try to maintain higher speeds.
  3. Difficulty starting, especially when the engine is warm – A failing pump can struggle to maintain pressure after the car has been running.
  4. Whining noise coming from the fuel tank area – A healthy pump makes a quiet hum for about 2 seconds when you first turn the key to the ON position. A loud whining or buzzing sound means the pump is wearing out.
  5. Sudden loss of power under acceleration – The pump can't deliver enough fuel to meet the demand when you step on the gas.
  6. Engine stalls unexpectedly – The pump may stop working intermittently, causing the engine to die without warning.

How to Confirm the Fuel Pump Is Bad

Before dropping the tank, do a quick test. Turn the ignition key to the ON position (but don't start the engine). Listen near the fuel filler cap. You should hear a quiet humming sound for about 2 seconds as the pump primes the system. If you hear nothing, the pump may be dead. If you hear a loud noise, the pump bearings are likely worn out.

You can also check the fuel pump fuse and relay. The fuse box is located under the hood on the driver's side. If the fuse is blown, replace it with one of the same amperage. If the fuse keeps blowing, you have a short somewhere in the circuit.

Tools and Parts You Will Need

To replace the fuel pump on your 1990 Acura Integra, gather these items before you start:

  • Replacement fuel pump (make sure it's the correct one for your specific model)
  • New O-ring gasket for the pump mounting flange
  • Floor jack and jack stands
  • Block of wood (to support the fuel tank)
  • Socket set (10mm, 12mm, and 14mm sockets)
  • Flathead screwdriver
  • Pliers
  • Shop towels or rags
  • Safety goggles
  • Fire extinguisher (keep it nearby, just in case)
  • Fuel line disconnect tool (if needed)

Step-by-Step Fuel Pump Replacement Procedure

Step 1: Relieve Fuel System Pressure

This is a critical safety step. Gasoline is highly flammable, and pressurized fuel can spray everywhere if you don't relieve the pressure first.

Start by disconnecting the negative battery cable. Then remove the fuel filler cap. Locate the fuel filter in the engine compartment. It's mounted against the firewall, next to the battery. On top of the fuel filter, there is a 12mm bolt. Wrap a shop towel around this bolt, then carefully turn it one full turn counterclockwise. You will hear a hissing sound as the pressure releases. Tighten the bolt back down when the hissing stops.

Step 2: Drain the Fuel Tank

The fuel tank should be no more than one-quarter full. If it's fuller, drive the car around until the fuel level drops, or siphon out the excess gas. A lighter tank is much easier to handle and reduces the risk of spills.

Step 3: Raise and Support the Vehicle

Use a floor jack to lift the rear of the car. Place jack stands under the frame rails for safety. Never work under a vehicle supported only by a jack. Remove the left rear wheel to give yourself better access to the fuel tank area.

Step 4: Disconnect the Fuel Lines and Electrical Connectors

Under the car, locate the fuel tank. You will see the fuel lines and electrical wires running to the pump assembly. The fuel supply line has a 12mm fitting that you need to loosen. The return line may have a clip that needs to be moved out of the way. Label each line so you know which one goes where during reassembly.

Unplug the electrical connector from the pump assembly. Be careful with the wiring – these connectors can become brittle over time.

Step 5: Support and Lower the Fuel Tank

Place a floor jack with a block of wood under the center of the fuel tank. This will support the tank's weight when you remove the mounting bolts. The tank is held in place by four bolts located at the corners of the mounting straps. Remove these bolts.

If your car has a filler neck nozzle, you may need to remove a snap ring to disconnect the filler neck from the tank. This allows the tank to drop down freely.

Slowly lower the jack, bringing the tank down with it. Be careful not to damage the fuel lines or wiring as you lower the tank. You only need to lower it enough to access the top of the pump assembly – you don't necessarily need to remove the tank completely.

Step 6: Remove the Old Fuel Pump

With the tank lowered, you can see the pump assembly. It's held in place by a mounting flange with several nuts (usually 6 nuts). Remove these nuts using a 10mm socket. Carefully lift the pump assembly out of the tank. The assembly will slide out at an angle, so be patient and gentle.

Place the pump assembly into a container to catch any fuel that may drip out. Now you can unbolt the old pump from the bracket. Remove the fuel filter sock from the bottom of the pump by prying off the retaining clip. Save this clip – you will need to reuse it.

Step 7: Install the New Fuel Pump

Compare the new pump with the old one to make sure they are the same size and shape. Mount the new pump into the bracket using the same rubber vibration isolator and fuel sock. Reuse the old retaining clip to secure the sock. Use new fuel-rated hose and clamps to connect the pump outlet to the bracket's supply line.

Make sure the screws on the hose clamps are positioned to the side, not on top. If the screw is on top, it will hit the tank wall when you slide the assembly back in.

Step 8: Reinstall the Pump Assembly

Slide the pump assembly back into the fuel tank at the same angle you removed it. Secure it with the six nuts and tighten them to 53 foot-pounds of torque. Reconnect the fuel lines and electrical connector. Make sure all connections are tight and secure.

Raise the fuel tank back into position using the jack. Reinstall the four mounting bolts and tighten them. Reconnect the filler neck if you disconnected it. Put the left rear wheel back on and lower the vehicle.

Step 9: Test for Leaks

Before you replace the rear seat or any covers, turn the ignition key to the ON position several times to pressurize the system. Listen for the pump to prime. Check all fuel line connections for leaks. If everything looks dry, start the engine and let it idle for a few minutes. Check again for leaks. If you see any fuel dripping, shut off the engine immediately and tighten the connections.

Step 10: Reinstall Everything

Once you are satisfied there are no leaks, replace the fuel pump access cover (if your car has one). Reinstall the rear seat cushion and tighten the bolt that holds it in place. Reconnect the negative battery cable. Take the car for a short test drive to confirm the new pump is working properly.

Why You Should Upgrade to a High-Quality Fuel Pump

When replacing the fuel pump on your 1990 Acura Integra, you have a choice between OEM and aftermarket parts. While aftermarket pumps may be cheaper, they often lack the durability and proper fitment of factory-quality parts. For long-term reliability, you want a pump that meets or exceeds OEM specifications.

A higher-flow pump is not just for modified cars. Even a stock Integra benefits from a pump that delivers consistent fuel pressure. A weak pump can cause the engine to run lean, which leads to poor performance, reduced fuel economy, and potential engine damage over time.

Recommended Fuel Pump for Your 1990 Acura Integra

For a reliable replacement that will last, consider the KEMSO brand fuel pump. KEMSO fuel pumps are designed as high-performance OEM replacement units. They are built to match or exceed the original factory specifications for your 1990 Acura Integra. Every KEMSO fuel pump comes with a lifetime warranty, which means you only buy it once. If the pump ever fails, you get a replacement at no additional cost.

KEMSO fuel pumps are tested for durability and consistent fuel delivery. They use high-quality materials that resist corrosion and wear. Whether you are restoring a classic Integra or just keeping your daily driver on the road, a KEMSO pump gives you peace of mind.

Visit the KEMSO website to find the correct fuel pump for your 1990 Acura Integra: https://www.kemsoracing.com/

Common Mistakes to Avoid

Forgetting to relieve fuel pressure – This is the most common mistake and the most dangerous. Always relieve pressure before disconnecting any fuel lines.

Not labeling the fuel lines – It is easy to mix up the supply and return lines. Label them before you disconnect them.

Using the wrong pump – Double-check that the replacement pump matches your specific model. The 1990 Integra uses a different pump than later models.

Skipping the fuel filter – Replace the fuel filter at the same time you replace the pump. A clogged filter can ruin a new pump quickly.

Over-tightening the mounting nuts – The pump assembly nuts only need 53 foot-pounds of torque. Over-tightening can strip the threads or crack the mounting flange.

How Long Should a Fuel Pump Last?

A properly installed fuel pump should last 100,000 miles or more. To extend the life of your new pump, keep your fuel tank at least one-quarter full at all times. Running the tank low causes the pump to run hotter and can suck up debris from the bottom of the tank. Replace the fuel filter every 30,000 miles as part of regular maintenance.

Final Thoughts

Finding and replacing the fuel pump on a 1990 Acura Integra is not a quick job, but it is something you can do yourself with basic tools and some patience. The key is knowing that the pump is inside the fuel tank and requires dropping the tank from underneath the car. Do not believe anyone who tells you it is accessible through the rear seat – that is for the 1994 and newer models only.

Take your time, follow the safety steps, and use quality parts. A fuel pump failure can leave you stranded, so it pays to do the job right the first time. If you want a pump that will last and comes with a lifetime warranty, choose KEMSO. Visit https://www.kemsoracing.com/ to find the right fuel pump for your 1990 Acura Integra and get back on the road with confidence.


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