Rajan Wilcox
FASS fuel systems are known for their ability to support high horsepower trucks, with some users reporting a gain of 10-20 horsepower after installation. The systems are designed to deliver a high flow rate of fuel to the engine, with some models, such as the Titanium Signature Series, offering advanced filtration benefits that improve fuel economy and increase horsepower and torque. While the impact on horsepower may vary depending on the specific truck and its modifications, FASS fuel systems are widely recognised for their ability to optimise fuel delivery and enhance engine performance.
| Characteristics | Values |
|---|---|
| Flow rate | 95 GPH, 100 GPH, 140 GPH, 165 GPH, 200 GPH, 220 GPH, 290 GPH |
| Horsepower range | 1,000+, 1200-1500 |
| Warranty | Void if purchased below the FASS website advertised pricing |
| Filtration | Eliminates over 99% of water in diesel fuel |
| Fuel polishing | Mass Flow Return (MFR) technology continually polishes fuel |
| Noise | Higher flow rate systems are noisier |
| Power difference | No difference unless the stock lift pump was faulty |
| Power increase | 10-20 HP gain |
| Fuel pressure | 15-17 PSI |
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$729
$99 $104.21
What You'll Learn
Horsepower gains
FASS diesel fuel systems can provide horsepower gains, but the extent of the increase depends on various factors, including the specific FASS fuel system, the vehicle's modifications, and the previous fuel system.
Firstly, it's important to note that FASS fuel systems are designed for a range of horsepower ratings. For example, the FASS Titanium Signature Series 290GPH Fuel System is designed for engines with 1200-1500 horsepower. Therefore, the horsepower gain from installing this particular system would depend on the starting horsepower of the engine.
Secondly, the benefits of a FASS fuel system extend beyond horsepower gains. FASS systems are known for their advanced filtration capabilities, removing water, air, and debris from diesel fuel. This can lead to improved engine performance, increased injection system life, and optimized fuel efficiency (MPG). While not a direct measure of horsepower, these improvements can enhance the overall power and efficiency of the vehicle.
That being said, there are reports of horsepower gains from installing FASS fuel systems. One user reported a gain of 10-20 horsepower after installing a FASS system, along with improved fuel pressure and quieter engine operation. However, another user noted that horsepower gains may only be noticeable if the previous stock lift pump was failing, as a functioning stock pump may not hinder performance significantly.
Additionally, the specific modifications made to a vehicle can impact the required flow rate (GPH) of the fuel system and, consequently, the potential horsepower gains. For example, larger injectors and custom tuning may require a higher GPH fuel system, which can support higher horsepower outputs. Commercial diesel trucks with modified engines may utilize higher-flow fuel systems, such as the 165GPH or 290GPH FASS Fuel Systems, to meet their increased horsepower demands.
In summary, while FASS fuel systems can provide horsepower gains, the specific increase depends on various factors, including the vehicle's baseline horsepower, the type of FASS fuel system installed, and any modifications made to the engine. Additionally, the benefits of FASS fuel systems extend beyond horsepower, providing improved fuel quality, enhanced engine performance, and increased injection system longevity.
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Flow rate
The flow rate, or GPH, of a FASS Fuel System refers to how much fuel the system can deliver to the engine. The right flow rate for a truck depends on its horsepower range and whether it has been modified. For example, a 100GPH FASS Fuel System is designed for stock trucks and can flow enough fuel for up to 600hp.
For commercial diesel trucks with PACCAR, Cummins, or CAT engines, 165GPH or even 290GPH Fuel Systems are regularly used. These higher-flow systems are designed for larger displacement and/or higher horsepower trucks.
The FASS Titanium Signature Series offers flow rates from 95 to 260 gallons per hour, catering to stock trucks and highly modified diesel engines with significant fuelling requirements. The Titanium Signature Series also incorporates Whisper Technology, which significantly reduces noise levels while maintaining flow rates and quality.
While the primary purpose of FASS Fuel Systems is filtration, increased fuel flow is a notable secondary benefit. FASS Fuel Systems can flow up to 540 gallons of fuel per hour, making them popular for diesel drag racing, sled pulling, and dyno competitions.
Upgrading to a higher GPH FASS Fuel System can result in a boost in performance, with some users reporting a gain of 10-20 HP and improved fuel pressure after installing a FASS Fuel System. However, the impact on mileage varies, with some users experiencing improvements while others observe no change.
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Compatibility
FASS fuel systems are compatible with a wide range of vehicles, including diesel trucks, Ford Power Strokes, and Dodge pickups. They are designed to optimize MPG, increase injection system life, and restore horsepower.
When considering a FASS fuel system, it is important to determine the appropriate size for your vehicle's power level. The GPH (gallons per hour) rating of the fuel system should match the fuel flow rate required by your engine. For example, a 100GPH FASS Fuel System is designed for stock trucks and can support up to 600 horsepower. Higher flow rate fuel systems, such as the 220GPH or 290GPH systems, are compatible with modified trucks that require more fuel flow.
It is recommended to consult with fuel system experts or the FASS support team to identify the right flow rate and parts needed for your specific vehicle. The compatibility and performance of the FASS fuel system can also be influenced by factors such as larger injectors, custom tuning, and the presence of other performance modifications.
In terms of specific vehicle compatibility, FASS fuel systems have been mentioned in online forums for Ford Power Stroke owners, Cummins Diesel engines, and Dodge trucks. Some users have reported successful installations and performance gains, while others have discussed the benefits of additional components, such as a sump or AirDog/FASS type pump for optimal fuel filtration and pressure.
It is worth noting that FASS fuel systems are designed to work with diesel engines, and the company offers a range of products compatible with different truck models and power levels.
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Maintenance
While there is no clear consensus on the exact horsepower increase provided by a FASS fuel system, several sources suggest that it can lead to a notable boost in performance. One user reported an increase of 10-20 HP on dyno runs after installing a FASS fuel system. Another user mentioned that while they did not notice a significant power difference, their fuel psi improved, indicating better fuel pressure.
- FASS fuel systems are designed to optimize fuel quality and filtration, removing water, air, and debris. This can lead to improved throttle response, drivability, and fuel efficiency.
- When upgrading to a higher GPH FASS fuel system, it is recommended to choose a system that is appropriately sized for your current power level. There is no benefit to buying a more aggressive fuel system unless you require the added fuel flow.
- FASS fuel systems are compatible with various truck models, including Cummins, Duramax, and Powerstroke. It is important to consider the specific modifications and horsepower range of your truck when selecting the right FASS fuel system.
- Regular maintenance and filter changes are crucial for optimal performance. FASS fuel systems offer simplified filter changes, making maintenance more accessible.
- For cold climates, FASS offers optional Fuel Heater Kits to improve cold-weather performance and reliability.
- Some users have reported combining their FASS fuel system with other components, such as a sump kit or a high-side kit to catch metal shards, for enhanced performance and protection.
- FASS fuel systems are known for their quality and reliability, with some users reporting problem-free performance for over three years and 200,000 miles.
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Noise
The noise level of a FASS Fuel System depends on the model and the flow rate.
The FASS Titanium Signature Series Fuel System incorporates FASS Whisper Technology (FWT), which drastically reduces the sound levels of the system to a "whisper" while increasing fuel flow rates. This series is designed for quiet diesel engines, and the FWT was in development and testing for over two and a half years to meet FASS Fuel System's high-quality and durability standards.
However, some users have reported that the FASS Fuel System can be noisy. One user noted that their FASS pump was noticeable and became "obnoxiously loud" in the last two years of use. Another user described the FASS pump as "so noisy".
The flow rate of the FASS Fuel System also affects the noise level. Higher flow rate Fuel Systems, such as the 220GPH and 290GPH Systems, will result in more noise. This is not typically an issue for modified trucks as they are already loud, but a 290GPH Fuel System on a stock truck can be quite noticeable from a noise perspective.
It is worth noting that the noise level of the FASS Fuel System may also depend on the specific truck model and other factors, such as the mounting style and the presence of other modifications.
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Frequently asked questions
FASS fuel systems can support trucks with 1,000+ horsepower and have been used for trucks with up to 3,000+ horsepower. The horsepower range that a FASS fuel system covers will depend on the system. For example, the Titanium Signature Series 290GPH Fuel System is designed for trucks with 1200-1500 horsepower.
The horsepower gain from a FASS fuel system depends on the truck's specifications and the FASS system used. Some users have reported a gain of 10-20 HP after a full day of driving.
It is recommended to buy a FASS fuel system that is appropriately sized for your current power level. You should also consider the flow rate or GPH (gallons per hour) required for your truck. Most stock or lightly modified diesel pickup trucks will not require more than a 100-140GPH fuel system. Commercial diesel trucks typically use 165-290GPH fuel systems.
FASS fuel systems can help to optimize MPG, increase injection system life, restore horsepower, and improve fuel quality. FASS filtration eliminates over 99% of the water found in diesel fuel and removes air and debris, resulting in improved performance and longevity of injectors and injection systems.
