Fuel System Upgrade: Fass Vs. Stock Lift Pump

FASS fuel systems are an alternative to stock lift pumps, which are used to improve the fuel mileage and engine performance of diesel vehicles. FASS stands for Fuel Air Separation System, and it combines a fuel lift pump with filtration and air separation to deliver clean and purified fuel. This system can be installed in a range of vehicles, including Ford, Dodge Ram, Chevy, GMC, and Class 8 trucks. While some people choose to keep their stock fuel pump and install a FASS system, others might decide to remove the old lift pump completely. This decision may depend on factors such as the available space in the engine bay and the potential impact on fuel system diagnostics.

Benefits of a FASS fuel system

FASS, or Fuel Air Separation System, is a leader in diesel fuel injection systems. A FASS fuel system combines a fuel lift pump with filtration and air separation to deliver exceptionally clean and purified fuel.

Improved Fuel Mileage and Engine Performance

FASS fuel systems are designed to improve your truck's fuel mileage and engine performance. The system combines a fuel lift pump with filtration and air separation, resulting in improved fuel delivery and engine performance.

Extended Life of Diesel Injection System

The advanced filtration and air separation capabilities of FASS fuel systems help extend the life of your diesel injection system by delivering cleaner and more purified fuel, reducing the risk of damage or clogging in the injection system.

High-Quality and Dependable Products

FASS maintains high-quality standards and is dedicated to providing dependable and durable products. Each FASS fuel system undergoes rigorous testing and inspection before shipping to ensure optimal function and performance.

Quiet Operation

The FASS Titanium Signature Series Fuel System utilizes whisper technology, making it substantially quieter than other aftermarket filtration systems. This feature improves pump life, flow rate, and service life while reducing noise levels.

Superior Filtration and Water Separation

FASS fuel systems offer improved fuel filtration of 3 microns or better and feature a built-in water separation filter. This ensures that your engine receives clean and water-free fuel, enhancing performance and protecting your fuel system.

By upgrading to a FASS fuel system, you can expect improved fuel efficiency, enhanced engine performance, and increased longevity of your diesel injection system.

Cost comparison

The cost of a FASS fuel system varies depending on the model and the retailer. FASS fuel systems are available for purchase on the official FASS website and through third-party retailers.

The FASS Titanium Signature Series Fuel System, for example, is a high-end model that offers improved pump life, flow rate, and service life, as well as reduced noise levels compared to other aftermarket filtration systems. This system also includes features such as improved fuel filtration, a built-in water separation filter, and FASS' patented air/vapor removal process.

On the other hand, the FASS Adjustable Fuel Pump is a more versatile and affordable option that allows for adjustable fuel pressures to meet the demands of high-performance applications.

When comparing the cost of a FASS fuel system to a stock lift pump, it is important to consider the potential benefits and improvements that a FASS fuel system can offer. A FASS fuel system can improve fuel mileage, engine performance, and extend the life of your diesel injection system. Additionally, FASS fuel systems are designed to be durable and dependable, with rigorous testing and inspection processes in place to ensure function and performance.

In terms of specific cost comparisons, it is difficult to provide exact figures as prices may vary over time and depending on the retailer. However, based on forum discussions, some users have indicated that the cost of upgrading to a FASS fuel system can be similar to the cost of replacing a stock lift pump with an OEM unit. Ultimately, the cost comparison between a FASS fuel system and a stock lift pump will depend on the specific models and retailers being considered.

Stock fuel pump issues

• Atypical Fuel Tank Noises: Unusual noises from the fuel tank, such as whining sounds, indicate a possible malfunction. Loud noises, in particular, could suggest that the fuel pump needs to be checked and potentially replaced.
• Engine Start-up Problems: A failing stock fuel pump may cause the engine to struggle to start or not start at all. This could be due to insufficient fuel being delivered to the engine.
• Power Loss and Decreased Performance: If your vehicle struggles to keep up with increased fuel demands, it might be due to a faulty stock fuel pump. This is noticeable when accelerating, as the car loses power and is unable to reach designated speeds.
• Poor Fuel Efficiency: Incorrect fuel injection can lead to increased fuel consumption and decreased fuel efficiency.
• Fuel Pump Failure: Stock fuel pumps may fail due to mechanical damage, irregular maintenance, low-quality engine oil, or faulty sensors. Age and high mileage are also factors that contribute to stock fuel pump failure.

It's important to note that stock fuel pump issues can vary depending on the vehicle's make, model, and specific circumstances. Diagnosing and addressing these issues promptly can help maintain the overall health of your vehicle.

Installation process

The FASS Fuel System is a fuel injection system for diesel vehicles. It is designed to improve fuel mileage, engine performance, and the lifespan of your diesel injection system.

Step 1: Purchase the FASS Fuel System Kit

The FASS Fuel System kit comes with all the necessary components for a complete installation. Make sure to select the correct kit for your specific vehicle and engine type.

Step 2: Remove the Old Fuel Pump

Before installing the FASS Fuel System, you will need to remove the old stock lift pump. This may involve disconnecting fuel lines, electrical connectors, and mounting hardware. Be sure to follow the appropriate safety procedures and refer to your vehicle's repair manual for detailed instructions.

Step 3: Install the FASS Fuel Pump

Mount the FASS fuel pump in the engine bay according to the instructions provided with the kit. This may involve drilling new mounting holes and securing the pump with brackets and bolts. Ensure that the pump is securely mounted and does not obstruct any moving parts or other components.

Step 4: Connect the Fuel Lines

Connect the FASS fuel pump to the vehicle's fuel lines. This may involve cutting and splicing fuel lines, as well as installing new fittings and hoses provided with the kit. Be sure to follow the instructions carefully to avoid leaks.

Step 5: Connect the Electrical System

Connect the FASS fuel pump to your vehicle's electrical system. This may involve splicing into existing wiring or installing a new relay and fuse. Ensure that all electrical connections are secure and insulated to prevent short circuits.

Step 6: Install the Fuel Filter

The FASS Fuel System includes a fuel filter that should be installed according to the instructions. This may involve cutting and splicing fuel lines, as well as installing new fittings and hoses. Ensure that all connections are secure and tight to prevent leaks.

Step 7: Test the System

Once the installation is complete, fill the fuel tank and turn on the ignition. Check for any leaks around the fuel lines, pump, and filter. Also, monitor the engine's performance to ensure that the FASS Fuel System is functioning correctly.

Please note that this is a general guide, and the specific installation process may vary depending on your vehicle's make, model, and year. Always refer to the FASS Fuel System installation manual and your vehicle's repair manual for detailed instructions specific to your vehicle.

Customer reviews

Another customer with a 2011 F-350 6.7 power stroke and 200,000 miles was concerned about the CP4 fuel pump failing and sought advice on whether a lift pump would prevent this issue. They received a response suggesting that a lift pump would likely prolong the life of a new CP4 but might not significantly improve an already high-mileage pump. The customer was also advised to consider a disaster prevention kit and a DCR or CPX pump as a possible alternative.

A separate review from a customer with a Dodge 5.9 and a 6.0 Powerstroke praised the FASS system, stating that they had not had a single fuel-related issue since installing it about three years ago. They also highlighted the ease of fuel filter changes and great pressure provided by the system.

Some customers expressed concerns about the potential failure of the CP4 pump and sought advice on whether to replace it with a FASS system or another alternative. One customer with a 2013 model that had 275,000 miles replaced the CP4 with a DCR pump for peace of mind. Another customer suggested saving up for an S&S pump to get rid of the CP4.

Overall, the reviews suggest that the FASS fuel system is a reliable and effective upgrade, offering improved performance, filtration, and quieter operation. However, for vehicles with high-mileage fuel pumps, it may not significantly improve the pump's lifespan, and other alternatives like the DCR or CPX pump might be recommended.

Frequently asked questions