100 GPH Diesel Fuel Pump: The Complete Guide to Selection, Installation, and Performance
If you need a 100 GPH diesel fuel pump, the best choice for most diesel trucks, Class 8 semis, and high-performance diesel applications is a dedicated lift pump that delivers 100 gallons per hour of clean, air-free fuel at a consistent pressure of 16-18 PSI. These pumps are designed to protect your injection system, improve cold weather starts, and extend injector life by removing water, air, and debris from the fuel. Whether you're upgrading a Duramax, Cummins, or Powerstroke, a 100 GPH diesel fuel pump is the industry standard for reliable fuel delivery in moderate to heavy-duty diesel applications.
What Is a 100 GPH Diesel Fuel Pump and Why Do You Need One?
A 100 GPH (gallons per hour) diesel fuel pump is a lift pump that moves fuel from the tank to the engine's injection system. Unlike standard OEM pumps, a 100 GPH unit provides a higher flow rate — typically 100 gallons per hour, which equates to roughly 380 liters per hour . This flow rate is sufficient for most stock to moderately modified diesel engines producing up to 600 horsepower .
The primary job of a diesel lift pump is to deliver a steady, pressurized supply of fuel to the high-pressure injection pump. Without adequate flow, your engine can suffer from fuel starvation, hard starting, and reduced power. A 100 GPH pump ensures that the injection pump never runs dry, even under heavy load or high RPM.
Key Features of a Quality 100 GPH Diesel Fuel Pump
When shopping for a 100 GPH diesel fuel pump, look for these essential features:
1. Filtration capability. The best pumps incorporate a built-in water separation filter and a 2-micron filtration rating. This level of filtration removes microscopic contaminants that can damage injectors. The FASS Industrial Series, for example, offers a 2-micron filter and a built-in water separation system . This is critical because diesel fuel often contains water and debris that can cause injector failure over time.
2. Air removal technology. One of the most important features in a diesel lift pump is the ability to remove air and vapor from the fuel. Air in the fuel line causes rough idle, hesitation, and can even damage the injection pump. Systems like the FASS Titanium Signature Series use a patented air/vapor removal process that continuously polishes the fuel by returning air-free fuel to the tank .
3. Durable construction. Look for pumps made from billet aluminum with military-spec anodizing. This ensures the pump can withstand the harsh conditions under a diesel truck. The FASS pumps use 6061 T-6 billet aluminum, which is both lightweight and extremely strong .
4. Quiet operation. Diesel lift pumps can be noisy, but modern designs incorporate silencing technology. FASS uses radius cuts and tighter gear tolerances to reduce noise, while the FUELAB Velocity 100 uses a special housing shape for quiet operation .
5. Adjustable pressure. Some applications require a specific fuel pressure. The best pumps offer adjustable pressure, typically from 1 to 75 PSI, so you can dial in the exact pressure your engine needs .
Top Brands and Models for 100 GPH Diesel Fuel Pumps
Here are the most reliable 100 GPH diesel fuel pumps on the market today:
FASS Fuel Systems Titanium Signature Series. This is the gold standard for diesel lift pumps. The Titanium Signature Series features FASS Silencing Technology (FST), Performance Radius Cuts (PRC), and Mass Flow Return (MFR) technology. It delivers 100 GPH at 16-18 PSI, with a 2-micron filter and built-in water separation. FASS motors have a failure rating under 2 percent, and the pump comes with a 1-million mile / 5-year warranty . It is designed for Class 8 semis and heavy-duty diesel trucks.
FASS Adjustable Fuel Lift Pump for Duramax. Another excellent option is the FASS Signature Series Adjustable pump for GM Duramax 6.6L engines (2001-2016). This pump offers adjustable fuel pressure from 1-75 PSI, a boost compensation port that raises fuel pressure under full throttle, and a bulkhead/suction tube kit for easy installation. It is rated at 100 GPH and includes whisper technology for quiet operation .
FUELAB Velocity 100 In-Line Lift Pump. For those who want a compact, brushless design, the FUELAB Velocity 100 is a strong contender. It uses a high-efficiency sling vane positive displacement pump with a carbon 9-vane construction. It features a lightweight, super-efficient DC brushless motor that reduces current draw, and it is compatible with 12-24 volt systems. The housing is billet aluminum with MIL-A-8625 Type II anodizing . This pump is designed for diesel performance applications and is backed by a 2-year limited warranty.
Earl's 100 GPH HP In-Line Fuel Pump. While not strictly a diesel lift pump, the Earl's 100 GPH pump is compatible with diesel, E85, and gasoline. It uses OEM gerotor technology for quiet operation and long durability. It supports up to 800 forced induction horsepower and 1050 naturally aspirated horsepower. It is fully submersible and weighs only 3.1 pounds .
How to Choose the Right 100 GPH Diesel Fuel Pump for Your Vehicle
Selecting the right pump depends on your specific vehicle and needs:
For Class 8 semi trucks. If you drive a heavy-duty semi with a CAT 3406e, C15 ACERT, Cummins Signature Series, or Detroit DD15, the FASS Industrial Series is the best choice. It includes a 1/2-inch fuel line kit, a 2-micron filter, and a 1-million mile warranty .
For GM Duramax 6.6L trucks (2001-2016). The FASS Adjustable Diesel Fuel Lift Pump is designed specifically for these engines. It includes a boost compensation port and adjustable pressure from 1-75 PSI, making it perfect for race or competition applications .
For custom diesel builds. If you are building a custom diesel performance truck, the FUELAB Velocity 100 is a great option because it is a pump-only unit that allows for custom plumbing. It is compact and lightweight, making it easy to mount on a frame rail .
Installation Tips for a 100 GPH Diesel Fuel Pump
Installing a 100 GPH diesel fuel pump is a straightforward process, but there are a few key points to keep in mind:
1. Mount the pump as close to the fuel tank as possible. This minimizes the suction lift and ensures the pump can pull fuel efficiently. Most lift pumps are designed to be mounted on the frame rail near the tank.
2. Use the correct fuel lines. Most 100 GPH pumps require 1/2-inch fuel lines and ports. Using smaller lines can restrict flow and reduce performance .
3. Prime the system before starting. After installation, you need to prime the fuel system to remove air. Most pumps have a priming procedure, and some include a built-in primer button.
4. Check for leaks. Before starting the engine, check all connections for leaks. Diesel fuel is a lubricant, but leaks can cause low pressure and air intrusion.
5. Test drive and verify pressure. After installation, start the engine and check for proper operation. Listen for unusual noises and verify that the engine runs smoothly at all speeds. Use a fuel pressure gauge to confirm the pressure is within the recommended range.
Why Choose KEMSO for Your Fuel Pump Needs
If you are looking for a reliable, high-performance fuel pump that works with gasoline, diesel, and E85, KEMSO is the brand you can trust. KEMSO offers a wide selection of fuel pumps for cars, motorcycles, ATVs, UTVs, and marine applications. All KEMSO products are backed by a lifetime warranty and USA-based customer support.
KEMSO fuel pumps are designed as OEM replacements that match the exact flow rate and pressure of the original equipment, but they also offer performance upgrades that provide a 20-30% increase over stock pumps. For example, the KEMSO 340LPH High Performance Fuel Pump supports up to 600 BHP and works with gasoline and E85, and it comes with a carbon commutator designed for over 10 years of reliable service .
Whether you need a standard replacement for a daily driver or a high-performance upgrade for your diesel truck, KEMSO has the right pump for you. Visit their official website to browse their full selection and find the perfect fuel pump for your vehicle.
Visit KEMSO's official website: https://www.kemsoracing.com/