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Bosch 66126 - Fuel Transfer Unit
Product Overview
The Bosch Fuel Transfer Unit part number 66126 is engineered to meet the specific needs of Mercedes-Benz vehicles, ensuring exceptional performance and reliability. This superior-quality fuel sender is directly compatible with part number 2124701394, making it an ideal choice for both car enthusiasts and professional mechanics. Constructed with premium-grade materials, this fuel transfer unit is built to withstand daily driving demands, providing long-lasting performance and durability. One of its key benefits is advanced technology that enhances fuel efficiency, helping you achieve improved gas mileage and lower maintenance costs over time. Choose Bosch 66126 for dependable performance and peace of mind every time you service your vehicle.
Cross Reference Numbers
This Bosch 66126 is equivalent to or replaces the following part numbers: 2124701394
Vehicle Compatibility
- Mercedes-Benz C250 1.8 L4 (2012–2015)
This may also fit other applications. Please use the vehicle selector tool to verify fitment.
Why Shop at eEuroparts.com?
- Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
- Exclusive Kits That Fitâ„¢ - complete repair solutions with no guesswork
- Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
- Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
- Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
- Established Trust: Serving the European auto community since 2000.
Frequently Asked Questions
What does the Bosch 66126 Fuel Transfer Unit do?
The Bosch Fuel Transfer Unit is responsible for accurately measuring the amount of fuel in your vehicle's tank, ensuring that the fuel gauge provides reliable readings to the driver. This is crucial for maintaining optimal fuel management and preventing unexpected fuel depletion.
How do I know if my Fuel Transfer Unit needs replacement?
Common symptoms indicating a failing fuel level sender include an inaccurate fuel gauge reading, fuel gauge stuck on empty, or fluctuating gauge readings while driving. If you notice these issues, it may be time to replace the fuel level sender.
Can I install the Bosch 66126 myself?
Yes, the Bosch 66126 can be installed as a DIY project. However, it is essential to follow safety precautions and consult a repair manual specific to your vehicle for proper installation guidelines.
What are the symptoms of a faulty Fuel Transfer Unit?
Symptoms of a faulty fuel level sender include erratic fuel gauge readings, a gauge that remains on empty even when fuel is present, and fluctuating readings while driving. These issues can lead to unexpected fuel depletion and may require immediate attention.
Why should I choose Bosch for my Fuel Transfer Unit needs?
Choosing Bosch ensures you receive a product built to OE specifications, offering reliable performance and durability. Order Bosch 66126 today for a factory-correct replacement that restores safety and performance.
Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.
- BrandBosch
- ManufacturerBosch
- MPN66126
- Part TypeFuel Transfer Unit
- OE Part Numbers2124701394
- FeaturesAdapter Type : N/A
Attachment Type (Fuel Pump Strainer) : Push On
Connector Gender : Female
Connector Quantity : 1
Connector Shape : Square/Rectangle
Electrical : Yes
Flow Rate : 1
Fuel Delivery Type : Fuel Injection
Fuel Filter Included : Yes
Fuel Sending Unit Included : Yes
Fuel Tank Pressure Sensor Included : No
Fuel Type : Gas
Gasket Or Seal Included : No
Gasket Or Seal Included : No
Gasket Or Seal Material : Rubber / Synthetic
Grade Type (Premium) : Premium
Housing Material : Polymer / Plastic
In Tank Or External : Internal
In-Line Pump : N
Inlet Count : 1
Inlet Outside Diameter : 810 mm
Inlet Type : OE Type
Inside Diameter : 0 mm
Lock Ring Included : No
Material : Mixed
Metered : No
Mounting Hardware Included : No
Mounting Type : OE type
New Or Remanufactured : New
Nozzle Shut Off Valve Included : No
Nozzle Type : Fixed
O-Ring Included : No
Outlet Outside Diameter : 810 mm
Outlet Quantity : 1
Outlet Size : 0 mm
Outlet Type : OE Type
Outside Diameter : 3646 mm
Package Contents : 1 Electric Fuel Pump
Port Quantity : 1
Power Source : Battery
Prop 65 Warning Label Required? : No
Pump Design : Electric
Pump Type : Electric
Pump Type : Electric
Pumping Transfer Method : Vane
Regulator Included : No
Rim Shape : Round
Seal And Lock Ring Included : No
Self Priming : Yes
Static Ground Terminal : No
Strainer Included : Yes
Suction Pipe Included : No
Terminal Gender : Male
Terminal Quantity : 2
Terminal Type : Blade
Thickness : 1.5 mm
Voltage : 12 V
Wire Gauge Measurement : 0 ga.
Wire Harness Included : No
Wiring Harness Included : No
Wiring Harness Length (mm) : 0 mm
- Fitment
- Fitment TypeVehicle Specific
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 2012 | Mercedes-Benz | C250 | Base (1.8 L4 GAS) | Notes: Right Side Tank |
| 2012 | Mercedes-Benz | C250 | Luxury (1.8 L4 GAS) | Notes: Right Side Tank |
| 2012 | Mercedes-Benz | C250 | Sport (1.8 L4 GAS) | Notes: Right Side Tank |
| 2013 | Mercedes-Benz | C250 | Base (1.8 L4 GAS) | Notes: Right Side Tank |
| 2013 | Mercedes-Benz | C250 | Luxury (1.8 L4 GAS) | Notes: Right Side Tank |
| 2013 | Mercedes-Benz | C250 | Sport (1.8 L4 GAS) | Notes: Right Side Tank |
| 2014 | Mercedes-Benz | C250 | Base (1.8 L4 GAS) | Notes: Right Side Tank |
| 2014 | Mercedes-Benz | C250 | Luxury (1.8 L4 GAS) | Notes: Right Side Tank |
| 2014 | Mercedes-Benz | C250 | Sport (1.8 L4 GAS) | Notes: Right Side Tank |
| 2015 | Mercedes-Benz | C250 | Base (1.8 L4 GAS) | Notes: Right Side Tank |
Warranty Overview
At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.
Standard Warranty – Most Parts
Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.
Protection: Defects in materials or workmanship under normal personal use.
Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.
Exclusions:
Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)
Commercial, fleet, rideshare, off-road, or racing use
Improper installation, misuse, accidents, or modifications
Not Covered: Labor, shipping, towing, or incidental costs.
Bison Performance Warranty – Our House Brand
Coverage: Limited Lifetime Warranty for as long as you own your vehicle.
Applies To: All products sold under the Bison Performance label.
Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.
Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).
What’s Included: Replacement of the defective product (labor and shipping excluded).
Warranty Claim Requirements
To keep claims fast and fair, we require:
Proof of purchase (invoice or order confirmation).
Photos or videos showing the defective part, order number, date, VIN, and odometer reading.
Diagnostic reports or part returns for non-visible issues may be requested.
Claims must be truthful, properly documented, and reflect normal consumer use.
Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.
For full details and exclusions, please see our complete Warranty Terms & Conditions.
This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.
Return Policy Overview
Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
To start a return, contact customer support via Chat or Contact Us.
Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)
Refunds: Issued to your original payment method within 3–5 business days after inspection
Exchanges: Not automatic — please return and reorder
Replacements: May be approved for incorrect or defective items reported within 7 days
Not returnable:
Used or installed parts
Electrical components
Opened filter kits, gaskets, or contaminated items
Final sale or custom orders
Important Notes:
Return shipping is your responsibility unless we made a verified error
Fitment is the customer’s responsibility (we can assist, but do not guarantee)
Country of origin may vary and is not grounds for return
For complete details, please see our full Return Policy.
This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.
Fast, Reliable Shipping — Straight to Your Door
We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.
We use trusted carriers like UPS, FedEx, and USPS.
Tracking info is emailed to you as soon as your order ships.
Delivery estimates at checkout are based on carrier data, but not guaranteed.
Need help with a shipment?
If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.
For complete details, please see our full Shipping Policy.
This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.


















