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Diesel Fuel Systems / Fuel Pumps / Lift Pumps


The diesel fuel in your truck contains contaminants dirt, water and air/vapor which is reducing power and damaging your diesel fuel injectors. Introducing the aFe POWER DFS780 Diesel Fuel System, with its patent-pending design capable of removing power-robbing debris such as air, water and other contaminants. The DFS780 also boosts fuel pressure ensuring constant availability for the high-pressure pump, improving throttle response and horsepower at all RPMs. 


The DFS780 was designed from the beginning to eliminate weaknesses found in other "fuel transfer" system. aFe has spent almost four years engineering what we feel is the best, most reliable system available. Depending on the specific application, we offer features such as boost-activated fuel flow increase, a high-impact polycarbonate "sight glass" to visually check fuel conditions, a reliable "marine grade" motor and Viton seals to name a few.


Features and Benefits 

High Efficiency Fuel Filter 

Rated at 5 microns, this fuel filter removes contaminants and works in conjunction with stock fuel filter.

Helical Spur Gears

Helical Bronze Spur Gears are used versus straight cut gears to ensure the quietest operation possible,

High Impact Sight Glass 

A clear high-impact polycarbonate sight glass allows visual inspection of the fuel entering into the system.

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1. Why do I need air separation?

Diesel fuel tends to “entrain” air due to its surface tension. Because of this, air can be trapped in the fuel and delivered to the high pressure pump where it gets compressed to 25,000+ psi. When these high pressure air bubbles are released through the fuel injector, they cause cavitation which is like small “explosions” that eventually ruin the injectors.


2. How much HP do I need to use this pump? 

Though the DFS780 can be used on a totally stock diesel vehicle, it was engineered for modified vehicles. BSFC (Brake Specific Fuel Consumption) for most modern turbocharged diesel engines is about 0.36 lbs/HP/hr. Since #2 diesel weighs about 7 pounds/gallon, which gives us about 19.5 HP/gallon/hr. The DFS780 will flow enough fuel (at rated pressure) to support over 2000 HP. 


3. How many gallons per hour does the DFS780 flow?

aFe tests each DFS780 unit before it leaves our facility to ensure peak performance. Each pump has been flowed and rated at a minimum 2.0 gpm, which is capable of supporting over 2000 horsepower.


4. How many microns is the filter? 

The DFS780 fuel filter is rated at 5 microns @ 99% efficiency. Additionally, the DFS780 was designed to work in conjunction with your stock fuel filter, giving you the ability to have multi-step filtration. You may also choose to use other aftermarket fuel filters with a lower micron rating.


5. What happens when I tow? Benefits?

When towing, you typically push the fuel system to its limits due to the continuous high loads. As the fuel requirements go up, the stock fuel system can’t always supply enough fuel, causing a loss in power. The DFS780 will provide more than enough fuel for almost all towing situations that there will be no loss of power.


6. What is the difference between the boost-operated and full-time system?

On some of our kits, we use a boost-activated switch to energize the DFS780 fuel pump. This allows the vehicle to run on the stock fuel pump during light load conditions and then when the power demands increase, the DFS780 pump “kicks in.” On the full-time system, the pump is active when the ignition is on.


7. What are Deutsch connectors?

Deutsch makes high quality weatherproof electrical connectors that are used in many O.E. (Original Equipment) applications, and why these are used with the DFS780, it’s the best.


8. I want to sell my truck. Can I put the fuel system back to stock?

The DFS780 was engineered for simple install and removal, allowing the vehicle to be easily returned to stock (unlike the competitors, we do not require you to drill/cut/modify the fuel tank).


9. Can I use this DFS on my stock truck?



10. I have some other mods like intake, exhaust, tuner and intercooler. Will this work on my truck?

Yes. The DFS780 is the perfect complement to other performance-enhancing modifications.


11. The other companies use 2 filters, why does DFS only have 1?

Other competitors use separate filter and water separator (not two filters). The DFS780 has integrated a clear water separation bowl onto the supplied high-efficiency fuel filter, eliminating the need (and expense) to replace two units. Additionally, the DFS780 was designed to work in conjunction with the factory fuel filter for even cleaner fuel.


12. How often do I need to change my fuel filter? Is the water separator bowl reusable?

Fuel filter change intervals will vary greatly depending on usage and fuel conditions. We have found 10k-20k miles replacements under normal conditions. And yes, the water separator bowl can be transferred from your old filter to your new aFe filter.


13. Will I feel the power?

The more modified the vehicle, the greater the power improvement. Most people report immediate “seat of the pants” drivability improvements.


14. Will I lose MPG?

As with most modifications, it varies. But the general feedback has been slightly improved fuel mileage.


15. Is the DFS continuously running?

Depending on the specific application, the DFS780 is either boost-activated or controlled with a relay system that turns the pump on while the engine is running.


16. How do I know the DFS780 is running?

Though the DFS780 does feature helical spur gears which are quieter than straight cut gears, you should be able to tell if the pump is running based upon feel.


17. How does the cost differ from other brands?

The DFS780 is priced higher than some competing units but they also lack some of our features and benefits. But, when you look at overall installed cost (with our reduced installation time), the DFS780 will typically come out as the best value.


18. Do I have choices of where I can install it?

Each DFS780 application is designed with specifically engineered mounting brackets (not generic). aFe will be offering a universal DFS780 kit for custom installations.


19. What is the warranty?

aFe’s obligation under the “Worry Free” Warranty is covered for two years from date of purchase. The “Worry Free” Warranty is limited to replacement of the defective or worn-out product with the same (or comparable) product in accordance with this warranty. Under no circumstances will the obligation or liability of aFe exceed the purchase price of the product as indicated on the original bill of sale. Warranties are non-transferable, contain no cash value and are only extended to the owner of the vehicle provided that the ownership has not changed since the installation of the product.


This warranty does not apply to products which have been altered, modified, damaged from neglect, abuse or from an accident, misused, improperly installed, contaminated with dirt or other contaminants, or used in applications other than recommended in our printed or digital media. aFe does not provide reimbursements for delay, shipping fees, labor, mileage, or any other costs involved in installation or re-installation of the products in question.

The DFS780 is powered by your ignition and can be run independently or in parallel with the stock fuel pump.


Choose the Best Diesel Fuel System for You

Supplied preset boost switch activates pump only under load, reducing wear & tear on the DFS780.

See through

• Clear high-impact polycarbonate sight glass allows visual inspection of fuel  

• Helical bronze spur gear pump design runs quieter than straight cut gears  

• IP56 Marine Grade (protected against dust intrusion and powerful water jets)  

• Contoured CNC machined manifold passages maintain flow to reduce pressure drop  

• 1/8” NPT fuel pressure gauge port  

• Viton seals which are compatible with most diesel and bio-diesel fuels  

• Typical installation time is two hours (plug and play - no modifications to fuel tank)  

• Easily reversible to stock - No permanent modification to the vehicle  

• Built in the U.S.A.

DFS780 Videos

DFS780 Fuel System FAQ

Boost Operated Kit (Part-Time)

Relay Controlled Kit (Full-Time)

sema award copy

SEMA 2015

DFS780 Fuel System Wins Best New Product

It’s always great to be recognized. You work hard, perform at your peak, and put your best foot forward to ensure success, and that perseverance can create some great results. aFe POWER is extremely pleased to announce that the new DFS780 Diesel Fuel System was chosen by SEMA Members as the Top New Performance Street Product at the 2015 SEMA Show in Las Vegas!


SEMA is the undisputed heavyweight when it comes to automotive shows, with product manufacturers entering over 3,000 new products for consideration, and the DFS780 rocked the vote and won the prestigious Performance Street vote. A testament to aFe POWER’s commitment to engineering and product development, which included over 4 years of designing, production and testing before releasing the DFS780.


DFS780 SEMA 2015 Coverage 

Product highlight of the new diesel fuel system offered by aFe Power

DFS780 Explained

A brief look into DFS780 options, advantages, and how it works with your diesel truck.

Water Separation Bowl

the water separation bowl allows for visual inspection of the collected water and provides ease of draining using the removable cap.

aFe DFS780 Install Video

aFe and XDP install the brand new system on a Dodge Cummins. 




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