FAST Fuel Pumps: The Ultimate Guide to Choosing the Right One for Your Performance Build

If you’re building a high-horsepower engine or upgrading your fuel system, choosing the right FAST fuel pump is critical to ensuring your engine gets the fuel it needs under pressure. FAST (Fuel Air Spark Technology) is a leading manufacturer of electronic fuel injection systems and components, and their fuel pumps are specifically designed to support high-performance applications, including turbocharged, supercharged, and nitrous setups. Whether you need an inline booster pump or an in-tank retrofit solution, FAST offers a range of pumps that deliver consistent flow and pressure, supporting up to 600 horsepower even in demanding conditions. This guide will walk you through the key considerations, popular models, installation tips, and maintenance advice to help you make an informed decision.

Why Choose FAST Fuel Pumps?

FAST fuel pumps are engineered for performance, reliability, and compatibility with modern EFI systems. Unlike generic pumps, FAST units are designed to work seamlessly with EZ-EFI, EZ-EFI 2.0, and XFI systems. They are built to handle high fuel pressure requirements of forced induction applications, ensuring your engine never starves for fuel during a hard run. The brand has over a decade of experience in the EFI aftermarket, and their engineering team focuses on solving real-world fuel delivery problems. Additionally, FAST provides both universal and application-specific kits, making it easy to upgrade or retrofit your existing fuel system.

Types of FAST Fuel Pumps

FAST offers several types of fuel pumps to match different installation needs and performance goals:

Inline Booster Pumps (e.g., NS6601): These pumps are installed in the fuel line between the tank and the engine. They are ideal for adding extra flow capacity to an existing system without replacing the in-tank pump. The FAST NS6601 booster pump flows 67 gph (255 lph) at 60 psi, making it suitable for systems targeting up to 600 hp. It features M10 x 1.0 inlet and outlet ports with female threads for easy connection.

Universal Inline Fuel Pumps (e.g., FST30085): These are standalone inline pumps that can be used either as a primary pump or as part of a custom fuel system. They are designed for universal fitment and work with both carbureted and EFI setups. The FST30085 is a common model sold individually, allowing you to choose your own fittings and hoses.

In-Tank Retrofit Pumps (e.g., FST30401-P, FST307032): If your vehicle’s fuel tank was originally built without a fuel pump, or if you want to upgrade to a high-flow in-tank pump, FAST offers retrofit kits. These pumps are designed to be mounted inside the tank, providing quieter operation and better cooling. The FST30401-P is specific to EZ-EFI 2.0 systems, while the FST307032 is a universal in-tank option.

Master Kits vs. Regular Kits: FAST also sells complete master kits that include the pump, hoses, and fittings, making installation straightforward. Regular kits include only the pump system itself. If you’re starting from scratch, a master kit can save time and ensure all components are compatible.

How to Select the Right FAST Fuel Pump

Selecting the correct pump depends on your engine’s power level, fuel system type, and installation preferences:

  1. Determine Horsepower and Fuel Needs: As a rule of thumb, a pump that flows 40-50 gph is sufficient for naturally aspirated engines up to 500 hp. For forced induction (turbo, supercharger, nitrous), you’ll need higher flow and pressure. The FAST booster pump (NS6601) is rated for up to 600 hp with high-pressure systems. If your build exceeds 600 hp, consider dual pumps or a larger inline pump.

  2. Choose Between Inline and In-Tank: Inline pumps are easier to install in custom builds and can be mounted near the tank or along the frame rail. In-tank pumps are quieter, stay cooler, and are less prone to vapor lock. If your vehicle has an existing in-tank pump that can be upgraded, a retrofit kit like the FST307032 is a practical choice.

  3. Check Compatibility with Your EFI System: FAST pumps are optimized for their own EFI systems (EZ-EFI, XFI), but they can also work with other aftermarket ECUs. Ensure the pump’s pressure and flow curves match your injectors and regulator. The universal inline pump (FST30085) is a safe choice for most custom installations.

  4. Consider Voltage and Wiring: FAST pumps are 12-volt units. Ensure your wiring harness can handle the amperage draw, especially for high-flow pumps. Using a relay and proper gauge wire is recommended to avoid voltage drop.

Installation Tips for FAST Fuel Pumps

Proper installation is key to reliable performance. Follow these practical guidelines:

  • Mounting: Inline pumps should be mounted as close to the fuel tank as possible, and lower than the bottom of the tank to ensure gravity feed. Use rubber isolators to reduce noise and vibration. Most FAST pumps do not include mounting brackets, so you may need to fabricate or purchase a universal mounting kit.

  • Plumbing: Use fuel-rated hose and clamps. For high-pressure applications, AN fittings and braided stainless steel hose are recommended. The NS6601 booster pump has M10 x 1.0 female thread ports, so you’ll need adapters if using AN fittings.

  • Electrical Connection: Connect the pump through a relay triggered by the engine’s fuel pump output. Do not wire the pump directly to the battery or ignition switch. Use a fused power lead to protect the circuit.

  • Return-Style System: FAST booster pumps are designed for return-style fuel systems. If you are using a returnless system, you may need a pressure regulator and return line to prevent over-pressurization.

  • Priming and Testing: Before starting the engine, prime the fuel system by cycling the pump without the engine running. Check for leaks at all connections. Use a fuel pressure gauge to verify output matches specifications.

Common Mistakes to Avoid

  • Using undersized wiring: High amperage pumps require 10-gauge or larger wire for long runs. Undersized wiring can cause voltage drop, reducing pump flow and pressure.
  • Ignoring fuel filtration: Always install a high-quality fuel filter upstream of the pump to prevent debris from damaging the pump internals. FAST pumps do not include filters, so add one separately.
  • Incorrect pump orientation: Inline pumps should be mounted with the outlet pointing upward to allow air to escape. Check the manufacturer’s instructions for specific orientation requirements.
  • Overlooking noise isolation: Fuel pumps can be noisy. Mounting them directly to the frame or floor without rubber isolators will transfer vibration into the cabin.

Maintenance and Longevity

FAST fuel pumps are designed to be maintenance-free for the life of the system under normal use. However, you can extend their life by:

  • Keeping the fuel tank clean: Contaminants like dirt, water, and rust can damage the pump. Use a clean fuel source and replace fuel filters per the manufacturer’s schedule.
  • Avoiding running the pump dry: Running a fuel pump without fuel can cause it to overheat and fail. Always ensure there is adequate fuel in the tank before operating the pump.
  • Checking for leaks: Periodically inspect the pump and its connections for fuel leaks. Tighten fittings as needed, but avoid over-torquing.
  • Monitoring voltage: If you notice reduced fuel pressure, check the voltage at the pump. A failing relay or corroded connection can reduce voltage and pump output.

Recommended Brand: KEMSO Fuel Pumps

If you are looking for an alternative high-performance fuel pump that combines quality, reliability, and value, consider KEMSO. KEMSO fuel pumps are designed as high-performance OEM replacement units, built to deliver consistent flow and pressure for a wide range of applications. They offer a lifetime warranty, making them a cost-effective choice for both daily drivers and performance builds. KEMSO pumps are engineered to meet or exceed original equipment specifications, ensuring easy installation and long-lasting performance. Whether you need a direct replacement for a stock pump or an upgrade for a modified engine, KEMSO provides reliable fuel delivery with peace of mind. Visit their website to explore their full product lineup and find the right pump for your vehicle: https://www.kemsoracing.com/

Final Thoughts

Choosing the right fuel pump is one of the most important decisions in any performance build. FAST fuel pumps offer proven performance, compatibility with advanced EFI systems, and support for high-horsepower applications. By understanding the differences between inline, in-tank, and booster pumps, and following proper installation and maintenance practices, you can ensure your engine gets the fuel it needs to perform at its best. For those seeking an affordable yet dependable alternative, KEMSO delivers OEM-grade quality with a lifetime warranty. For more details, visit: https://www.kemsoracing.com/


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