aFe Diesel Fuel System

2011–2012 Ram 2500 / 3500 6.7L Diesel

Part #: 42-12034

Overview

The aFe DFS780 Diesel Fuel System is engineered specifically for 2011 and 2012 Ram 2500 and 3500 trucks equipped with the 6.7L Cummins diesel engine. Designed to optimize fuel delivery, this advanced fuel system addresses common contaminants found in diesel fuel such as dirt, water, and air vapor that can degrade engine performance and damage fuel injectors. By ensuring cleaner fuel and consistent pressure, the DFS780 enhances throttle response and overall horsepower across all RPM ranges, making it an essential upgrade for diesel truck owners seeking improved reliability and power.

Ideal for enthusiasts and professionals alike, this system supports the demanding needs of heavy-duty applications, towing, and daily driving by maintaining optimal fuel quality and pressure for the high-pressure fuel pump.

Key Features

The aFe DFS780 Diesel Fuel System incorporates innovative technology to protect your engine and boost performance. Key features include:

• Patent-pending design that effectively removes contaminants such as air, water, and dirt from diesel fuel
• Enhances fuel pressure to ensure constant availability for the high-pressure fuel pump
• Improves throttle response and horsepower at all engine speeds
• Reduces injector wear by delivering cleaner fuel, extending injector life
• Compatible with factory fuel system components for seamless integration
• Designed specifically for 2011–2012 Ram 2500 and 3500 6.7L Cummins diesel engines
• Durable construction built to withstand harsh diesel fuel contaminants and operating conditions

Construction & Design

The DFS780 is crafted with high-quality materials engineered to endure the rigors of diesel fuel systems. Its robust construction ensures long-lasting performance and resistance to corrosion and wear. The system’s design focuses on efficient separation and removal of air and water vapor, which are common in diesel fuel and detrimental to injector performance. Precision engineering guarantees that fuel pressure is consistently maintained, supporting the high-pressure pump’s demands without interruption.

Performance & Sound

By delivering cleaner fuel and maintaining optimal fuel pressure, the aFe DFS780 Diesel Fuel System directly contributes to smoother engine operation and enhanced power output. Drivers will notice improved throttle response and more consistent horsepower delivery across the RPM range. While the system does not alter exhaust sound, the improved combustion efficiency can lead to a more refined engine feel and performance.

Installation & Fitment

Installation of the aFe DFS780 is designed to be straightforward for experienced technicians familiar with diesel fuel systems. It is a direct-fit upgrade for 2011 and 2012 Ram 2500 and 3500 models with the 6.7L Cummins engine, requiring no major modifications. Proper installation ensures optimal fuel flow and contaminant removal, maximizing the system’s benefits.

What's Included

• aFe DFS780 Diesel Fuel System assembly
• All necessary mounting hardware and fittings for direct installation
• Installation instructions

Ideal For

This diesel fuel system is ideal for Ram 2500 and 3500 owners who demand reliable power and longevity from their 6.7L Cummins engines. It is especially beneficial for those who tow heavy loads, operate in harsh environments, or seek to maintain peak engine performance by protecting fuel injectors from contaminants. Whether for daily driving or heavy-duty use, the DFS780 provides a critical upgrade to fuel system efficiency and durability.

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.