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03-40538-007 | Genuine Detroit Diesel® Water Separator PumpDescription: Fuel Water Separator For Detroit Diesel, Freightliner Brand: Detroit Diesel ondition: New Part Number: 03 40538 007 Type: Separator Weight: 6 lbs Fitment 03 40538 007: Detroit Diesel & Freightliner heavy duty Specifications For 03 40538 007: Voltage: 14 V Power: 200 W Flow Rate: 660 L h Micron Rating: 7 microns Length: 152. 70 mm Width: 175 mm Height: 364. 10 mm Port Thread Size: M22 X 1. 5 mm Water Capacity: 0. 30 L A fuel water
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Description: Fuel Water Separator For Detroit Diesel, Freightliner
Brand: Detroit Diesel® 
Сondition: New
Part Number: 03-40538-007

Type: Separator
Weight: 6 lbs

Fitment 03-40538-007:
Detroit Diesel & Freightliner heavy-duty

Specifications For 03-40538-007:

Voltage: 14 V
Power: 200 W
Flow Rate: 660 L/h
Micron Rating: 7 microns
Length: 152.70 mm
Width: 175 mm
Height: 364.10 mm
Port Thread Size: M22 X 1.5 mm
Water Capacity: 0.30 L


A fuel/water separator is a filtering device used in diesel engines to remove water and contaminants from the fuel before it reaches the engine’s injectors.

Main Functions of a Fuel/Water Separator 03-40538-007

Remove Water from Diesel Fuel

Diesel naturally attracts and absorbs moisture.
Water in the fuel can corrode injectors, damage pumps, and cause poor combustion.


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.


 Signs of a Failing Fuel Water Separator 03-40538-007

1. Hard Starting or No Start

Water or debris in the fuel can cause poor combustion or injector misfiring.
The engine may crank for a long time or fail to start at all.


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.

 


Manufacturer information


A subsidiary of Daimler Trucks North America, Detroit Diesel® is a worldwide leader in manufacturing state-of-the-art engines, transmissions, and axles for various applications, including Western Star Trucks and Freighliner. Established more than 80 years ago, the company has expanded its product lineup to include telematics and advanced safety systems for a complete trucking solution. It takes pride not just on its product coverage but also its undying commitment to excellent customer service. It is composed of passionate, highly skilled, and knowledgeable people who ensure Detroit Diesel remains at the forefront of the heavy-duty engine and chassis components manufacturing industry. Headquartered in Detroit, MI, the company focuses on providing only the highest quality and innovative trucking solutions in the industry.

Warranty
First Truck Parts offers a 365-days warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.


03-40538-007 | Genuine Detroit Diesel® Water Separator Pump

Item no : 52369938412
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