03 40538 007 | Genuine Detroit Diesel® Fuel Water Separator

Filter Out Debris & Contaminants

Captures dirt, rust, and other particles that can clog the fuel system.

Protect Engine Components

Keeps fuel injectors and pumps clean, ensuring consistent performance and longer lifespan.

Improve Engine Efficiency

Clean, dry fuel burns more efficiently, reducing smoke, misfires, and power loss.

2. Loss of Power or Poor Acceleration

A clogged separator restricts fuel flow, causing low fuel pressure and weak engine performance—especially under load.

3. Engine Misfires or Rough Idle

Contaminated fuel can cause inconsistent fuel delivery, making the engine run rough or uneven.

4. Water-in-Fuel Warning Light

Many diesel vehicles have a sensor in the separator that detects water buildup.
When triggered, it warns you to drain the separator immediately.

5. Excessive Smoke from Exhaust

If water or debris reaches the injectors, it can cause incomplete combustion, leading to white or gray smoke.

6. Fuel Leaks or Visible Contamination

You may notice cloudy fuel, rust, or sludge when inspecting the separator or draining it.

7. Frequent Fuel Filter Clogging

If the separator fails, water and debris can reach the main fuel filter, causing it to clog more often than usual.