aFe DFS780 Fuel Pump

2005–2010 Dodge Ram 2500 / 3500 5.9L / 6.7L Cummins Diesel

Part #: 42-12032

Overview

The aFe DFS780 Fuel Pump is a high-performance diesel fuel system engineered specifically for 2005 to 2010 Dodge Ram 2500 and Ram 3500 trucks equipped with 5.9L or 6.7L Cummins diesel engines. Designed to address common diesel fuel delivery challenges such as contaminants, water intrusion, and entrained air, this advanced fuel pump ensures cleaner fuel reaches the engine, protecting critical components like fuel injectors from damage.

With nearly four years of dedicated development, the DFS780 delivers consistent fuel pressure and availability to the high-pressure transfer pump, resulting in improved throttle response and horsepower across the entire RPM range. Its boost-activated fuel flow adapts dynamically to engine demands, making it an ideal upgrade for diesel truck owners seeking enhanced performance, reliability, and durability under demanding driving conditions.

Key Features

The aFe DFS780 Fuel Pump incorporates innovative design elements and premium materials that set it apart from conventional fuel transfer systems:

• Clear high-impact polycarbonate sight glass for easy visual inspection of fuel quality without disassembly
• Helical spur gears that operate quieter and more efficiently than traditional straight-cut gears
• Marine-grade motor construction providing superior protection against dust, water, and harsh environments
• Contoured CNC-machined manifold designed to optimize fuel flow and reduce restrictions
• Fuel pressure gauge port for convenient monitoring of fuel system performance
• OE-quality Viton seals ensuring long-lasting durability and resistance to fuel contaminants
• Boost-activated fuel flow increase to meet higher engine demands during boost conditions
• Built in the U.S.A. with stringent quality control standards for reliability and consistency

Construction & Design

The DFS780 fuel pump is crafted with premium materials and precision engineering to withstand the rigorous demands of diesel fuel systems. Its high-impact polycarbonate sight glass allows users to monitor fuel conditions in real time, preventing downtime and maintenance surprises. The marine-grade motor ensures reliable operation even in dusty or wet environments, while the Viton seals provide excellent chemical resistance to prevent leaks and degradation over time.

The CNC-machined manifold is contoured to optimize fuel flow by reducing turbulence and pressure drops, ensuring consistent and efficient fuel delivery to the engine. This robust construction guarantees long-term durability and dependable performance in heavy-duty applications.

Performance & Sound

By effectively removing entrained air, water, and contaminants from diesel fuel, the DFS780 improves combustion efficiency and protects sensitive fuel injectors from premature wear or failure. The boost-activated fuel flow feature ensures the engine receives adequate fuel pressure during high-demand situations such as towing or heavy acceleration, enhancing throttle response and horsepower throughout the RPM range.

The use of helical spur gears contributes to quieter operation compared to traditional gear designs, resulting in a smoother and more refined fuel pump sound that reduces noise without sacrificing performance.

Installation & Fitment

The aFe DFS780 Fuel Pump is designed for direct bolt-on installation on 2005–2010 Dodge Ram 2500 and Ram 3500 trucks equipped with 5.9L or 6.7L Cummins diesel engines. Installation typically requires around two hours and does not involve major modifications, making it accessible for experienced DIY enthusiasts as well as professional installers.

This fuel system integrates seamlessly with the existing fuel setup, providing an immediate and noticeable upgrade in fuel delivery performance and overall engine reliability.

What's Included

• aFe DFS780 Diesel Fuel System assembly
• Clear polycarbonate sight glass
• Fuel pressure gauge port
• Installation hardware and seals
• Detailed installation instructions

Ideal For

The DFS780 Fuel Pump is ideal for Dodge Ram 2500 and 3500 owners who demand improved fuel delivery and enhanced engine performance from their diesel trucks. It is especially beneficial for those who frequently tow heavy loads, operate under demanding conditions, or seek improved throttle response and horsepower. Additionally, it is well-suited for enthusiasts looking to protect their fuel injectors and maintain long-term engine reliability in harsh environments.

aFe POWER (Advanced FLOW Engineering) offers dyno-proven intake, filtration, and exhaust upgrades aimed at measurable performance gains. The brand’s lineup is geared toward enthusiasts looking for better airflow, improved sound, and durable materials—from cold air intakes to stainless exhaust systems for street and track applications.