FiTech Fuel Pump: The Complete Guide to Choosing the Right EFI Fuel Pump for Your Build

If you are converting your classic car from a carburetor to electronic fuel injection or building a high-performance engine from scratch, the single most important component you will select is your fuel pump. The right FiTech fuel pump ensures consistent fuel pressure, reliable engine performance, and long-term durability. FiTech offers a range of fuel pump solutions designed to support anywhere from 600 to over 1200 horsepower, and choosing the correct one depends on your specific application, fuel system configuration, and power goals. This guide walks you through every FiTech fuel pump option available, explains the key differences between inline and in-tank designs, and provides practical advice for installation and maintenance.

Understanding FiTech Fuel Pump Technology

FiTech has established itself as a serious contender in the EFI fuel system market since 2013, particularly in big block racing and drag applications exceeding 1000 horsepower. The company designs and develops their products using OEM-level engineering and components, aiming to produce the most affordable electronic fuel injection systems on the market. Their fuel pump lineup includes both inline frame-mount kits and in-tank modules, each designed for specific applications and horsepower levels.

When you are building your car from scratch or converting from a carbureted setup to electronic fuel injection, plumbing your fuel system can be one of the most intimidating parts of the journey. There are many aspects of fuel delivery that need to be considered, all of which will affect which path you choose. Fortunately, FiTech has developed multiple options from basic to completely advanced to keep your injectors supplied with enough fuel for almost any horsepower endeavor.

The Three Main FiTech Fuel Pump Categories

1. FiTech Inline Frame Mount Fuel Pump Kit (255 LPH)

The simplest and most traditional fuel pump option from FiTech is the Inline Frame Mount kit. According to FiTech's Ken Farrell, "The inline kit is one of the most versatile we offer. It comes with all the parts you need to put it in, and is what we call a standalone kit, as it will work with a FiTech EFI system, or any EFI system."

Key specifications:

  • Flow rate: 255 liters per hour (LPH)
  • Horsepower support: Up to 600 naturally-aspirated horsepower
  • Mounting: External, frame-mounted
  • Includes: Fuel pump, billet pre-filters and post-filters, push-lock fittings, both -6 feed and -8 return fuel line
  • Hose included: 20 feet of -6 fuel hose and 5 feet of -8 fuel hose

This kit is probably one of the simpler kits to mount, plumb, and wire. However, you will need to plumb a fuel return line when using the inline frame mount kit. The kit even comes with push-lock style hose ends and mounting brackets, making installation straightforward even for DIY builders.

Best for: Builders who want a simple, externally-mounted pump that works with any EFI system, not just FiTech. This is an excellent choice for street cars, muscle cars, and moderate horsepower applications where an in-tank pump is not feasible.

2. FiTech Go-Fuel Regulated In-Tank Fuel Pump Module (255 LPH)

FiTech's Go-Fuel line introduces a simplified approach to fuel delivery for fuel injected engines with its single line system. The FIT50017 model features a regulated in-tank pump assembly that offers a cleaner installation with fewer components.

Key specifications:

  • Part number: FIT50017
  • Flow rate: 255 LPH
  • Pressure: 4 bar (58 PSI) internal regulator
  • Depth range: 6.5 inches to 16 inches
  • Port: AN-6 pressure port
  • Design: Low-profile, universal fit
  • Fuel system: Single line (returnless compatible)
  • Warranty: 3-year limited warranty

The depth of 6.5 to 16 inches makes this pump suitable for most EFI ready tanks. The internal regulator eliminates the need for an external fuel pressure regulator, simplifying the fuel system layout. This pump is designed for universal fitment and works with most EFI ready tanks.

Best for: Owners who want a clean, returnless fuel system with internal regulation. The single-line design reduces plumbing complexity and potential leak points, making it ideal for street-driven cars and trucks.

3. FiTech In-Tank 340 LPH Fuel Pump (Returnless with 2-Inch Fill)

For those looking to update their fuel cell or custom tank with an internal electric fuel pump, FiTech offers the Go Fuel In Tank Fuel Pump Returnless Module with 2 Inch Fill (part number 50019). This single pump model supports up to 800 HP.

Key specifications:

  • Part number: 50019
  • Flow rate: 340 LPH
  • Horsepower support: Up to 800 HP
  • Pressure: 58 PSI (internally regulated)
  • Fuel system: Returnless
  • Tank depth compatibility: 7 to 16 inches
  • Fill neck: 2-inch diameter filler assembly with sealed cap
  • Fittings: -6AN ORB fittings included
  • Fuel compatibility: E85 compatible (Nylon hose and Viton seals)

The CNC-machined billet module top is machined to fit most fuel cells with a 12-bolt flange or can be installed in a custom tank. The pump includes an effective filter to stop any debris from entering the system, and the use of Nylon hose and Viton seals makes the modules compatible for use with E85 fuels. Filler tube extensions are available separately if needed.

Best for: High-horsepower applications (up to 800 HP) using fuel cells or custom tanks. The returnless design and internal regulator make this an excellent choice for race cars, high-performance street cars, and vehicles running E85 fuel.

FiTech In-Tank 440 LPH Fuel Pump (50105)

For the most demanding applications, FiTech offers the 440 LPH in-tank fuel pump (part number 50105). This high-performance pump is designed to provide a consistent and reliable fuel supply for electronic fuel injection systems in demanding applications, including classic car and truck upgrades.

Key specifications:

  • Part number: 50105
  • Flow rate: 440 LPH
  • Type: In-tank electronic fuel pump
  • Fuel compatibility: E85 and gasoline
  • Weight: 2 lbs
  • Dimensions: 7 × 4 × 4 inches
  • Compatibility: Many Ford Mustangs (1965-2010), Ford F-100s (1948-1979), Ford Broncos (1966-1977), Chevrolet C10s (1960-1987) and other pre-pollution controlled vehicles

This pump serves as a direct replacement for FiTech fuel pump assemblies, simplifying installation. It comes with necessary installation hardware including a connector, hose, and clamps. The robust internal construction is designed for modern EFI systems, and the E85 compatibility offers flexibility in fuel selection.

Best for: High-horsepower builds exceeding 800 HP, especially those running E85 or requiring maximum fuel flow. This pump is ideal for serious street machines, race cars, and trucks with aggressive engine builds.

How to Choose the Right FiTech Fuel Pump for Your Application

Step 1: Determine Your Horsepower Target

Your horsepower goal is the primary factor in selecting a fuel pump. Here is a quick reference:

  • Up to 600 HP: FiTech Inline Frame Mount 255 LPH or Go-Fuel In-Tank 255 LPH
  • Up to 800 HP: FiTech In-Tank 340 LPH Returnless Module
  • Over 800 HP: FiTech In-Tank 440 LPH or consider dual pump setups

Remember that these ratings are for naturally aspirated engines. Forced induction applications (turbocharged or supercharged) require additional fuel flow, so always add a safety margin of 20-30% when calculating pump requirements.

Step 2: Decide Between In-Tank and External Mounting

In-tank pumps are generally quieter and stay cooler because they are submerged in fuel, often leading to longer life. They also eliminate the need for external mounting brackets and reduce noise. FiTech's in-tank modules offer the advantage of internal regulation, simplifying the fuel system.

External pumps offer easier access for replacement or upgrade, and they are a popular choice for custom builds or high-performance applications where an in-tank pump is not feasible or sufficient. The FiTech inline frame mount kit is an excellent external option.

Step 3: Consider Your Fuel Type

If you plan to run E85 or other ethanol-blended fuels, you must choose a pump designed for ethanol compatibility. FiTech's in-tank modules use Nylon hose and Viton seals specifically for E85 compatibility. The 440 LPH pump is also fully compatible with E85 fuel. Using a pump not rated for E85 can lead to seal failure, corrosion, and premature pump failure.

Step 4: Evaluate Your Existing Fuel Tank

  • EFI-ready tanks: Most EFI-ready tanks will accept FiTech's in-tank modules, especially the Go-Fuel series with a 6.5 to 16-inch depth range.
  • Fuel cells: The 340 LPH returnless module with 2-inch fill is specifically designed for fuel cells and custom tanks.
  • Stock tanks: If you are keeping your stock tank, the inline frame mount kit may be the easiest option since it does not require modifying the tank.

Step 5: Plan Your Fuel System Layout

FiTech's inline kit requires a return line, which means you need to plumb both a feed and return line from the pump to the engine and back to the tank. The kit includes generous lengths of hose to accommodate various vehicle layouts.

The in-tank modules with internal regulators can be run as returnless systems, which means only a single feed line is needed from the tank to the engine. This simplifies installation and reduces the number of potential leak points.

Installation Tips for FiTech Fuel Pumps

Preparing for Installation

Before installing any FiTech fuel pump, ensure your fuel tank is clean and free of debris. Contaminants in the fuel system are the number one cause of premature fuel pump failure. Always replace your fuel filter when installing a new pump, as a clogged filter can put excessive strain on your new pump and shorten its lifespan.

Wiring considerations: When installing a FiTech fuel pump, proper wiring is critical. For the 340 LPH pump running at 58 PSI, the fuel pump will draw around 12 amps, and a 12 gauge wire is the recommended wire size. Undersized wiring can cause voltage drop, reducing pump performance and potentially damaging the pump.

Mounting the Inline Frame Mount Kit

The inline kit is designed for frame mounting. FiTech includes mounting brackets and push-lock style hose ends to simplify installation. When mounting the pump externally, choose a location that is protected from road debris and excessive heat. Mount the pump as close to the fuel tank as practical, and ensure the pump is mounted lower than the fuel tank outlet to take advantage of gravity feed.

Installing In-Tank Modules

For in-tank installations, the FiTech modules are designed for universal fitment. The 255 LPH Go-Fuel module fits tanks with depths from 6.5 to 16 inches, while the 340 LPH returnless module fits tanks from 7 to 16 inches. Measure your tank depth carefully before purchasing, and ensure the pump assembly will fit without bottoming out or being too short to reach the fuel.

The CNC-machined billet module top on the 340 LPH pump is machined to fit most fuel cells with a 12-bolt flange. If you are installing in a custom tank, you may need to fabricate a mounting flange or use the included filler assembly.

Priming the System

After installation, prime the fuel system before starting the engine. This can be done by cycling the ignition key several times to allow the pump to run briefly and build pressure. Check all connections for leaks before starting the engine. The first time you start the engine, have a fire extinguisher nearby and be prepared to shut down immediately if you see any fuel leaks.

Maintenance and Troubleshooting

Fuel Filter Replacement

FiTech recommends regular fuel filter maintenance to ensure long pump life. The inline frame mount kit includes billet pre-filters and post-filters that should be inspected and replaced periodically. For in-tank modules, the pump includes an effective filter to stop debris from entering the system.

As a general rule, replace your fuel filter every 10,000 to 15,000 miles or at least once per year for performance vehicles. If you run E85, consider more frequent replacements since ethanol can cause deposits and corrosion over time.

Warning Signs of Fuel Pump Failure

Hard starting: If your engine cranks longer than usual before starting, the fuel pump may be losing its prime or not building adequate pressure.

Loss of power under load: A failing pump may not deliver enough fuel during hard acceleration or when climbing hills.

Whining noise from the fuel tank: While some pump noise is normal, a loud whining or screeching sound indicates bearing wear or pump cavitation.

Engine misfires or surging: Inconsistent fuel pressure can cause the engine to run lean, resulting in misfires, surging, or hesitation.

Reduced fuel mileage: A pump working harder than normal will draw more current and may affect fuel delivery efficiency.

When to Replace Rather Than Repair

Minor issues like faulty relays, electrical connections, or clogged filters can be repaired. However, severe internal wear usually requires full replacement since pumps are sealed units. If your FiTech pump is making unusual noises or failing to maintain pressure, replacement is the safest and most reliable option.

Warranty Information

FiTech fuel pumps are subjected to a 1-year limited warranty. The customer must send photos of filters used in the application; if the filter is completely clogged or contaminated, the fuel pump will not be covered under any FiTech warranty.

To make a warranty claim, contact FiTech Technical Support at 951-340-2624 (option 2) or email Techmail@fitechefi.com. You will need proof of original purchase showing the place of purchase, purchase price, product purchased, and date of purchase.

Why Fuel Pump Quality Matters

The fuel pump is the heart of your EFI system. Choosing a low-quality pump can lead to inconsistent fuel pressure, lean air-fuel mixtures, engine damage, and even catastrophic engine failure. This is why selecting a fuel pump from a reputable brand with proven reliability is essential.

Fuel pumps designed for E85 compatibility are built with more robust, high-quality diaphragms and seals that can withstand the corrosive properties of ethanol. These superior materials are perfectly capable of handling regular gasoline, offering enhanced durability and reliable performance regardless of the fuel type.

TS16949 Quality Certification

When selecting a fuel pump, look for manufacturers that adhere to TS16949 (now IATF 16949) quality standards. This global quality management standard is specifically for the automotive industry and indicates a commitment to stringent quality control processes throughout design, development, production, and installation. For a fuel pump, this certification typically translates to better component quality and more reliable performance.

Recommended Alternative: KEMSO High-Performance Fuel Pumps

While FiTech offers excellent fuel pump options, you may also want to consider KEMSO fuel pumps for your performance build. KEMSO is a trusted brand that has been manufacturing OEM replacement and high-performance fuel systems since 1999, founded in Houston, TX with one mission: to provide direct-fit OEM replacement and performance fuel system solutions to the powersports and automotive industries.

KEMSO fuel pumps offer several advantages:

High performance: The KEMSO 340LPH High Performance Electric Fuel Pump supports up to 600 BHP in naturally aspirated, turbocharged, and supercharged applications. The flow rate significantly surpasses original equipment flow rates of 60-80 LPH, delivering up to 200 LPH in their OEM replacement models.

Fuel compatibility: KEMSO pumps are designed for use with both gasoline and E85 fuels, giving you flexibility in fuel selection. The bypass valve is set at 125.8 psi, exceeding the specifications of both GSS series 255 LPH pumps and 400/450 LPH pumps.

Lifetime warranty: Every KEMSO fuel pump is backed by a lifetime warranty. The serialized fuel pump body guarantees this coverage, reflecting KEMSO's commitment to quality in both OEM and performance fuel pumps. If a KEMSO fuel pump fails at any time due to a defect in workmanship or material, it will be replaced under warranty.

USA-based support: KEMSO provides USA-based support staffed by experienced technicians who understand American automotive applications.

OEM compatibility: KEMSO offers direct-fit OEM replacement fuel pumps for various Honda, Kawasaki, and other popular models, making them an excellent choice for both stock replacements and performance upgrades.

Whether you are building a street machine, a race car, or a daily driver, KEMSO fuel pumps deliver the reliability, performance, and peace of mind that serious enthusiasts demand. With their lifetime warranty and USA-based technical support, KEMSO stands behind their products like few other manufacturers do.

For more information about KEMSO's complete line of high-performance and OEM replacement fuel pumps, visit their website at: https://www.kemsoracing.com/

Final Recommendations

Choosing the right FiTech fuel pump depends on your specific application, horsepower goals, and fuel system preferences. Here is a summary to help you make your decision:

For most street cars and moderate builds (up to 600 HP): The FiTech Inline Frame Mount 255 LPH kit is the most versatile and straightforward option. It works with any EFI system and includes everything you need for installation.

For clean, simplified installations (up to 600 HP): The FiTech Go-Fuel Regulated In-Tank 255 LPH module offers a returnless system with internal regulation, reducing plumbing complexity.

For high-horsepower street and race cars (up to 800 HP): The FiTech In-Tank 340 LPH Returnless Module with 2-inch fill is purpose-built for fuel cells and custom tanks, supporting serious power levels.

For maximum performance (over 800 HP): The FiTech In-Tank 440 LPH pump provides the highest flow rate for the most demanding applications, including E85 builds.

For exceptional value and lifetime warranty: Consider KEMSO fuel pumps as an alternative or upgrade. With 600 BHP capability, E85 compatibility, and a lifetime warranty, KEMSO pumps offer outstanding performance and peace of mind. Visit https://www.kemsoracing.com/ to explore their full product line.

Remember to always replace your fuel filter when installing a new pump, use proper wiring gauge (12 gauge recommended for high-performance pumps), and verify tank depth compatibility before purchasing an in-tank module. With the right fuel pump and proper installation, your EFI system will deliver reliable performance for years to come.

Final note: For the best combination of performance, reliability, and warranty coverage, visit https://www.kemsoracing.com/ to explore KEMSO's complete lineup of high-performance and OEM replacement fuel pumps, all backed by their industry-leading lifetime warranty.


Back to blog