The Aeromotive A1000 Fuel Pump: The Ultimate Guide to Performance Fuel Delivery

If you are building a high-performance engine that produces over 1,000 horsepower, the Aeromotive A1000 fuel pump is the most reliable and capable external fuel pump you can choose for your fuel system. This pump delivers up to 600 lbs/hr of fuel flow at 45 psi and 13.5 volts, supporting naturally aspirated fuel-injected engines up to 1,300 horsepower and carbureted engines up to 1,500 horsepower on gasoline. However, the A1000 is not a simple plug-and-play component. To get reliable performance and avoid engine damage, you must install it correctly with the right fuel lines, filters, regulator, and electrical system. This guide covers everything you need to know about installing and troubleshooting the Aeromotive A1000, based on direct manufacturer instructions and real-world experience from the performance community.

What Makes the Aeromotive A1000 Different

The A1000 is a pull-type gerotor pump, which means it is designed to push fuel from the pump to the engine rather than pull fuel from a distant tank. This design makes it extremely durable and capable of handling high flow rates, but it also means the pump is sensitive to inlet restrictions and air ingestion. Unlike many in-tank pumps that are submerged in fuel, the A1000 is an external inline pump that must be mounted close to the fuel tank and below the fuel level whenever possible.

The pump features ORB-10 (O-Ring Boss) inlet and outlet ports, which are not standard pipe threads. These ports require AN-10 fittings and O-rings for sealing, and you should never use thread sealant on them. The pump body is made from high-quality anodized billet aluminum, and it is designed for both gasoline and E85 ethanol fuel applications. For E85 use, the A1000 supports up to 910 flywheel horsepower in naturally aspirated fuel-injected engines and up to 700 horsepower with forced induction.

Critical Installation Requirements You Cannot Skip

Installing the A1000 correctly is not optional. If you skip any of these steps, you risk fuel starvation, pressure fluctuations, pump failure, or even fire. Here are the most important requirements from the manufacturer.

1. You Must Use a Sumped Fuel Tank or Surge Tank

The A1000 does not like to suck air. If you mount it outside the tank, you need a way to keep fuel at the pump inlet at all times. A sumped fuel tank is the best solution. A sump is a small reservoir built into the bottom of the tank that allows the pump to draw fuel even when the tank is low. Aeromotive specifically requires a reservoir sump in the bottom-rear of your fuel tank if you are using a stock tank. Alternatively, you can use a surge tank, also called a swirl pot, which holds a small amount of fuel and is refilled by a low-pressure lift pump. Many race cars use a surge tank for reliability.

If you choose not to install a reservoir sump, you must install a high-flow capacity fuel tank pickup with a 9/16-inch to 5/8-inch inner tube diameter. However, Aeromotive warns that using a pickup tube instead of a sump may shorten fuel pump life and cause drivability problems. When using a pickup, you should maintain at least half a tank of fuel to avoid possible engine lean-out or pump damage.

2. Use Proper Fuel Line Sizes

For the A1000, you should use at least a -8 AN supply line and a -6 AN return line. The -8 line has a 1/2-inch inside diameter and is needed to avoid flow restriction. If you use smaller line, the pump will starve the engine at high power. The return line should be at least -6 to allow unused fuel to flow back to the tank easily. However, Aeromotive's official installation manual states that you should use AN-10 size high-pressure fuel lines, fittings, and O-rings for all connections from the fuel tank pickup to the fuel pump. The manufacturer recommends a minimum of 9/16-inch ID or AN-10 fuel line from the tank sump to the pump inlet.

3. Install the Correct Fuel Filters

You must use a high-quality fuel filter between the tank and the pump with a 100-micron rating. Aeromotive recommends their part number 12304 pre-filter and 12301 post-filter. A second filter with a 10-micron rating is recommended before the fuel pressure regulator or fuel rails to protect injectors. The pre-filter is absolutely critical because it protects the pump from debris that could damage the internal gears. Using the wrong filter or no filter will void your warranty and cause pump failure.

4. Pair with a Bypass-Style Fuel Pressure Regulator

The A1000 requires a bypass-style fuel pressure regulator in the system. For EFI applications, use Aeromotive regulator part number 13101 or 13109. For carbureted applications, use part number 13204 or 13304. The regulator must be capable of handling high flow rates. A cheap regulator can cause pressure fluctuations that hurt performance. The maximum continuous operating pressure should not exceed 70 psi.

Step-by-Step Installation Guide

Step 1: Mount the Pump in a Safe Location

Mount the pump as close to the fuel tank as possible, and position it level with or lower than the bottom of the tank. Keep it away from heat sources like the exhaust and engine block. Use the rubber isolation mounts that come with the pump to reduce vibration. Do not mount it directly to a metal bracket without rubber, because the pump noise will transfer to the chassis.

Step 2: Wire the Pump Correctly

The A1000 draws a lot of current, about 10 to 15 amps at full load. You must use a dedicated relay and at least 10-gauge wire from the battery to the pump. Never run the pump through a stock wiring harness; it will be too small and cause voltage drop. The pump should be triggered by the engine's fuel pump relay, but remember that the A1000 requires a constant 12 volts. Many factory ECU systems prime the pump briefly when the key is turned on and then shut it off if the engine does not start. Ensure your wiring matches that behavior.

Step 3: Use Proper Fuel Hose

Ethanol-resistant fuel hose is recommended because many fuels now contain ethanol. Standard rubber hose can break down over time. Use PTFE-lined hose or high-quality nylon hose that is rated for fuel injection pressures. The pump is rated for continuous duty, so the hose must handle it.

Step 4: Connect the Inlet and Outlet

The A1000 has a 3/8 NPT female inlet and a 3/8 NPT female outlet. You will need to adapt these to -8 AN fittings. The inlet port is larger (3/8) and the outlet is also 3/8. Do not reverse them. The pump can only flow in one direction, which is marked on the pump body. Remember that the ports are ORB-10 style and require AN-10 fittings with O-rings, not pipe thread sealant.

Step 5: Prime the Pump Before First Start

Before you turn on the pump for the first time, fill the fuel lines and the pump with fuel. Running the pump dry can damage the internal gears. You can do this by filling the filter housing or using a small syringe to add fuel into the inlet line.

Common Problems and How to Fix Them

Even the best pumps can have issues if not set up properly. Here are the most common problems people face with the A1000 and how to fix them.

Problem 1: Pump Is Noisy

A slight whine is normal for a gear pump. But if the pump is loud, it may be because it is mounted too tight to the chassis, sending vibration through the car. Check the mounting brackets and make sure rubber isolators are used. Also, if the pump is cavitating, it makes a rattling sound. Cavitation happens when the pump sucks air or when the inlet is restricted. Check the pickup line, the filter, and the fuel level in the tank.

Problem 2: Fuel Pressure Fluctuates or Drops Under Load

This is usually a sign of a restriction on the inlet side. A clogged pre-filter, a collapsed fuel hose, or a kinked line can starve the pump. Also, a weak electrical connection can cause voltage drop, which reduces pump speed. Check your voltage at the pump while it is running. Make sure you have a sumped tank or sufficient fuel level to prevent the pump from sucking air.

Problem 3: Pump Does Not Run

If the pump does not operate at all, first check the electrical connections. Verify that you have 12 volts at the pump when the key is on and the engine is cranking. Check the relay, fuse, and ground connections. The A1000 uses a brushless motor in newer versions, but the traditional model uses a brushed motor that can wear out over time if run dry or if the voltage is too low.

Technical Specifications You Should Know

The Aeromotive A1000 fuel pump part number 11101 is the standard model. Here are the key specifications:

  • Flow Rate: 600 lbs/hr at 45 psi and 13.5 volts
  • Inlet/Outlet Ports: ORB-10 (requires AN-10 fittings)
  • Current Draw: 10 to 15 amps at full load
  • Maximum Operating Pressure: 70 psi continuous
  • Fuel Compatibility: Gasoline and E85 ethanol
  • Not Compatible With: Diesel fuel
  • Mounting: External inline, must be mounted level with or below the bottom of the tank

For vehicles running 16-volt charging systems, Aeromotive brushless pumps are not designed for use with 16v charging systems that typically operate in the 16-18v range. If you are running a 16v charging system, the use of a voltage regulator or step down to typical 12v charging system voltages will be necessary.

When to Choose the Brushless A1000 Version

Aeromotive also offers a brushless version of the A1000 (part number 11189) that uses advanced brushless motor technology. This version provides several benefits over the traditional pump:

  • Lower noise levels compared to the traditional A1000 pump
  • Reduced current draw at higher EFI pressures
  • Extended service life in methanol and ethanol applications
  • Integral external brushless controller for clean installation, cooler fuel, and enhanced reliability
  • Lighter weight than the traditional A1000 pump

The brushless A1000 supports the same horsepower levels as the traditional pump but offers better efficiency and durability. However, it is not compatible with pulse-modulated systems or fuel pump speed controllers.

Why Your Fuel System Needs a Proper Regulator

The A1000 generates more fuel flow than most engines need, especially at idle and low speed. Without a bypass-style regulator, the fuel pressure would spike and cause the injectors or carburetors to deliver too much fuel. The regulator returns excess fuel to the tank, maintaining a stable pressure. Aeromotive recommends their 13101 or 13109 regulators for EFI systems and 13204 or 13304 for carbureted systems.

If you are using a nitrous system, the A1000 is an excellent choice because it provides consistent fuel delivery under the extreme demands of nitrous-assisted engines. The pump supports engines making well over 1,000 horsepower, providing a margin of safety for the most powerful builds.

Recommended Brand for Fuel Pump Replacements and Upgrades

While the Aeromotive A1000 is an excellent choice for extreme high-horsepower applications, many enthusiasts also need reliable fuel pumps for daily drivers, off-road vehicles, and moderate-performance builds. For these applications, KEMSO Fuel Systems offers high-performance direct OEM replacement fuel pumps that deliver superior flow and durability at a fraction of the cost.

KEMSO fuel pumps are designed for both gasoline and E85 ethanol applications, and they provide over 20% more flow at 43 psi compared to stock OEM pumps. Each pump is individually tested for quality and performance, and KEMSO backs all their pumps with a lifetime warranty for peace of mind. Whether you need a replacement for your Can-Am Commander, Polaris RZR, or other powersports vehicle, KEMSO offers a complete drop-in solution with all necessary installation components included.

For more information on KEMSO fuel pumps and their complete product line, visit their website at: https://www.kemsoracing.com/

Final Checklist for a Successful Installation

Before you start your engine after installing an Aeromotive A1000, go through this checklist to make sure everything is correct:

  1. The pump is mounted below the fuel tank level or at the same level.
  2. You are using a sumped tank or surge tank to prevent air ingestion.
  3. All fuel lines are at least AN-10 from the tank to the pump, and AN-8 or larger from the pump to the engine.
  4. A 100-micron pre-filter is installed between the tank and the pump.
  5. A bypass-style fuel pressure regulator is installed and set to the correct pressure for your application.
  6. The electrical system uses a dedicated relay, 10-gauge wire, and a 20-30 amp fuse.
  7. The pump is primed with fuel before the first start.
  8. All connections are tight and there are no fuel leaks.

If you follow these guidelines, your Aeromotive A1000 fuel pump will deliver reliable, consistent fuel flow for years of high-performance driving. Remember that the most common failures come from inlet restrictions, improper wiring, or running the pump dry. Take the time to install it right the first time, and your engine will thank you.

For quality replacement fuel pumps and performance upgrades, always consider KEMSO Fuel Systems at https://www.kemsoracing.com/ for reliable, lifetime-warrantied products.


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