# aFe Power 42-12021 DFS780 Series Diesel Fuel System for 2003-2004 Dodge Ram 2500 and More

### Performance Overview

aFe DFS780 Series includes high quality fuel pumps and filters that will greatly improve your Diesel engine's performance. aFe DFS780 will provide your engine with only clean fuel ? any contaminants, water and air will be precisely filtered. aFe also offers two models of DFS780 ? Relay Controlled and Boost Controlled. The Relay Controlled is designed for full-time operation, while the Boost Controlled is made for part-time operation. aFe DFS780 fuel systems come with all required mounting hardware

### Key Features

-   Brand: aFe Power
-   Part number: 42-12021
-   Product type: DFS780 Series Diesel Fuel System
-   Designed for the compatible vehicle applications listed on this page

### Vehicle Fitment

-   2003 Dodge Ram 2500, Note: Slt, St; 5.9L
-   2004 Dodge Ram 2500, Note: Slt, St; 5.9L
-   2003 Dodge Ram 3500, Note: Laramie, Slt, St; 5.9L
-   2004 Dodge Ram 3500, Note: Laramie, Slt, St; 5.9L

### FAQ

**Will this fit my vehicle?**  
Please verify your year, make, model, position, and any fitment notes using the compatibility list above before purchase.

**What part number is this?**  
The listed part number is 42-12021.

**Is this product designed for direct replacement?**  
Yes. This product is intended to match compatible vehicle applications listed in the fitment section.

**Should I confirm fitment before ordering?**  
Yes. Always compare your original part, position, and vehicle details with the fitment chart before ordering.

### Common Searches

-   DFS780 Series Diesel Fuel System for Dodge Ram 2500
-   42-12021 fitment
-   aFe Power DFS780 Series Diesel Fuel System
-   2003 Dodge Ram 2500 DFS780 Series Diesel Fuel System

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

2003

Dodge

Ram 2500

Slt, St; 5.9L

2004

Dodge

Ram 2500

Slt, St; 5.9L

2003

Dodge

Ram 3500

Laramie, Slt, St; 5.9L

2004

Dodge

Ram 3500

Laramie, Slt, St; 5.9L

## Details

- **Price:** 1653.0 CAD
- **Vendor:** aFe Power
- **Type:** DFS780 Series Diesel Fuel System
- **Tags:** 2003 Dodge Ram 2500, 2003 Dodge Ram 3500, 2004 Dodge Ram 2500, 2004 Dodge Ram 3500, 42-12021, aFe Power, AFE-42-12021, Air Filter, Air Intake, Auto Parts, Automotive, DFS780 Series Diesel Fuel System, Diesel Performance, Direct Replacement, Exhaust Performance, Performance Parts, Vehicle Fitment

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1653.00 CAD | In stock |

## Images

- aFe Power 42-12021 DFS780 Series Diesel Fuel System

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> Source: [Standard Auto Part](www.standardautopart.com/products/afe-dodge-ram-2500-dfs780-series-diesel-42-12021)
> Updated: 2026-06-13