Aeromotive 340 Fuel Pump: The Ultimate Guide to Performance and Reliability

If you are looking for a fuel pump that can handle high horsepower demands without compromising durability, the Aeromotive 340 fuel pump is one of the best choices on the market. Designed for both street and race applications, this pump delivers consistent fuel pressure, supports up to 1,000 horsepower with proper modifications, and is built to last under extreme conditions. In this guide, we will cover everything you need to know about the Aeromotive 340 fuel pump, including its specifications, installation tips, common issues, and how to maximize its performance for your vehicle.

What Is the Aeromotive 340 Fuel Pump?

The Aeromotive 340 fuel pump is an in-tank electric fuel pump known for its high flow rate and reliability. It is part of Aeromotive’s popular Stealth series, which is designed to replace factory fuel pumps in many modern vehicles while providing significantly higher fuel delivery. The “340” in its name refers to its flow rate: approximately 340 liters per hour (LPH) at a base pressure of 40 psi. This makes it suitable for naturally aspirated and forced induction engines, including turbocharged and supercharged setups.

Key Features of the Aeromotive 340 Fuel Pump:

• High Flow Capacity: Delivers up to 340 LPH, making it ideal for engines producing 500 to 1,000 horsepower.
• In-Tank Design: Works as a drop-in replacement for many OEM pumps, reducing installation complexity.
• Turbine Technology: Uses a turbine-style impeller instead of a gerotor or vane pump, which reduces noise and improves durability.
• Compatibility: Works with gasoline, ethanol blends up to E85, and methanol.
• Built-in Check Valve: Prevents fuel drain-back after shutdown, ensuring quick starts.

How Does the Aeromotive 340 Fuel Pump Compare to Other Pumps?

When choosing a fuel pump, you need to consider flow rate, pressure, noise, and longevity. Here is how the Aeromotive 340 stacks up against common alternatives.

1. Flow Rate and Pressure:
The Aeromotive 340 provides 340 LPH at 40 psi, and it can maintain 255 LPH at 70 psi. For comparison, a standard Walbro 255 LPH pump delivers 255 LPH at 40 psi but drops significantly at higher pressures. This means the Aeromotive 340 is better suited for high-boost applications where fuel pressure rises with boost pressure.

2. Noise Level:
Turbine-style pumps like the Aeromotive 340 are generally quieter than gerotor pumps, which can produce a whining sound. Users often report that the Aeromotive 340 is barely audible inside the cabin, especially when installed in a properly insulated fuel tank.

3. Durability and Reliability:
Aeromotive uses high-quality materials, including hardened commutators and carbon brushes, to extend the pump’s life. The turbine design also reduces wear because it does not use metal-to-metal contact like some other pump types. Many users report the pump lasting over 100,000 miles with proper use.

4. Ethanol Compatibility:
E85 and other ethanol blends can corrode standard fuel pumps. The Aeromotive 340 is built to resist ethanol corrosion, making it a reliable choice for flex-fuel vehicles.

When Should You Upgrade to an Aeromotive 340 Fuel Pump?

You do not need to replace your stock fuel pump unless your engine modifications demand more fuel. Here are common scenarios where upgrading makes sense.

1. High Horsepower Modifications:
If you have installed a supercharger, turbocharger, or nitrous oxide system, your engine requires more fuel than the stock pump can provide. For example, a stock LS engine with a centrifugal supercharger producing 600 horsepower may need a pump that can deliver at least 300 LPH. The Aeromotive 340 meets this requirement.

2. Ethanol or Methanol Fuel:
Ethanol has a lower energy density than gasoline, meaning your engine needs more fuel volume to produce the same power. If you are running E85, you may need up to 30% more fuel flow. The Aeromotive 340’s high flow rate compensates for this.

3. Poor Fuel Pressure at High RPM:
If you notice fuel pressure dropping on the dyno or during a pull, your stock pump may be maxed out. Upgrading to the Aeromotive 340 can restore consistent pressure and prevent lean conditions that cause engine damage.

4. Frequent Track Use:
Racing puts extreme demand on fuel pumps. The Aeromotive 340’s robust construction handles sustained high-flow conditions without failure, making it popular for drag racing and road racing.

Installation Tips for the Aeromotive 340 Fuel Pump

Installing the Aeromotive 340 is straightforward if you have basic mechanical skills, but proper steps ensure optimal performance. Below are important details.

1. Choose the Correct Kit:
Aeromotive sells the pump individually or as part of a drop-in kit for specific vehicles. Common kits include the 18688 for many GM trucks and SUVs, and the 18687 for Ford Mustangs. Always verify fitment before ordering.

2. Prepare the Fuel Tank:
Before installation, drain the fuel tank and disconnect the battery. Remove the access plate on top of the tank or drop the tank, depending on your vehicle. Clean the inside of the tank if it has debris, as foreign particles can damage the new pump.

3. Wiring Considerations:
The Aeromotive 340 draws about 12 amps at 40 psi. Use a relay kit to supply power directly from the battery, as the factory wiring may not handle the load. Aeromotive offers a relay kit (part 16301) that simplifies this step. Also, use 10-gauge wire for the power supply to minimize voltage drop.

4. Install a New Fuel Filter:
Always replace the fuel filter when installing a new pump. A clogged filter can restrict flow and cause the pump to work harder, shortening its lifespan. Use a filter rated for at least 100 psi.

5. Do Not Run the Pump Dry:
Fuel pumps rely on fuel for cooling and lubrication. Running the pump with an empty tank can damage it. Always keep at least 1/4 tank of fuel when the pump is operating.

Common Problems with the Aeromotive 340 Fuel Pump and How to Fix Them

Even reliable components can have issues if not used correctly. Here are frequent problems users encounter and solutions.

1. Noise or Whining:
If the pump is louder than usual, check for air leaks in the suction line or a clogged inlet. Also, ensure the pump is mounted securely with the rubber isolator to reduce vibration. If the whining persists, the pump may be cavitating due to low fuel level or a restrictive intake.

2. Fuel Pressure Drops:
Pressure drops usually indicate a clogged filter, a failing pump, or inadequate voltage. Measure voltage at the pump during operation; it should be at least 13.5 volts. If voltage is low, upgrade the wiring or alternator.

3. Pump Fails Prematurely:
Premature failure often results from running the pump dry, using contaminated fuel, or overtaxing it with high pressure. Ensure you are not exceeding the pump’s specified pressure range (40-70 psi). Also, install a pre-filter to catch debris.

4. No Fuel Delivery:
Check the fuse and relay first. If they are fine, test the pump with direct battery power. If it does not run, the motor may be seized or burned out due to age or abuse.

How to Maximize the Lifespan of Your Aeromotive 340 Fuel Pump

To get the most out of your investment, follow these practices.

1. Use a Good Fuel Filter:
Install a high-quality inline filter with a micron rating below 10 microns. Replace it every 10,000 miles or whenever you change the fuel pump.

2. Avoid Running Low on Fuel:
Keep the tank at least 1/4 full to prevent the pump from sucking air and overheating.

3. Use Proper Voltage:
Ensure your charging system maintains 13.8 to 14.2 volts. Low voltage forces the pump to draw more current, generating heat and reducing its lifespan.

4. Choose the Right Fuel Pressure Regulator:
Match the regulator to your setup. A constant pressure regulator is fine for many applications, but a boost-referenced regulator is necessary for forced induction to keep fuel pressure consistent.

5. Inspect the Pump Annually:
Check for leaks, rust, and debris. Replace the pump if it shows signs of wear, especially if you hear unusual noises.

Real-World Performance: Does the Aeromotive 340 Deliver?

Many users have shared their experiences online, and the general consensus is positive. For example, a 2019 Ford Mustang GT with a Procharger kit running 10 psi of boost produced 700 horsepower at the wheels using the Aeromotive 340 pump alone. The owner reported steady fuel pressure throughout the pull. Another user with a 2005 Subaru WRX swapped to an Aeromotive 340 and saw a 10 horsepower gain simply because the stock pump could not keep up with the increased fuel demand from E85.

However, some users point out that the pump may not be sufficient for setups over 800-900 horsepower without additional support, such as a surge tank or secondary pump. For those applications, Aeromotive offers the 400 LPH or 500 LPH pumps.

Cost and Value: Is the Aeromotive 340 Worth It?

The Aeromotive 340 typically costs between $200 and $300, which is more expensive than a generic Walbro 255 but less than high-end pumps like the Injector Dynamics ID1700X. Given its flow capacity and durability, the price is reasonable for enthusiasts who need reliable fuel delivery.

Compared to repairing a blown engine from a lean condition, the investment in a quality fuel pump is minimal. Many consider the Aeromotive 340 a “buy once, cry once” component.

Where to Buy the Aeromotive 340 Fuel Pump

You can purchase the pump from several reputable sources. Summit Racing, Jeggs, and Amazon stock the product, but always check for authenticity. There are counterfeit pumps on the market that look similar but use inferior materials. Buy from authorized dealers or directly from Aeromotive to ensure warranty coverage.

Tips to spot fake pumps:

• Authentic pumps have a serial number engraved on the body.
• The packaging includes a holographic sticker.
• The pump feels heavier than a fake due to better metal content.

Conclusion

The Aeromotive 340 fuel pump is a proven upgrade for those seeking higher fuel flow and reliability. It supports up to 1,000 horsepower with proper tuning, works well with ethanol fuels, and installs easily in many vehicles. While not perfect for extreme power levels without additional modifications, it offers an excellent balance of performance and cost. By following the installation and maintenance tips in this guide, you can enjoy consistent fuel delivery and peace of mind for years of driving or racing.

Whether you are building a weekend track car or a daily driver with bolt-on modifications, the Aeromotive 340 fuel pump deserves serious consideration. It is a component that works when you need it most, and that is the highest compliment you can give a fuel pump.