MERCURY X004D6 Bigfoot Fuel Pumps High Pressure 50HP

( Manufacturer Part Number: X004D6 ), ( Part Type: Fuel Pressure Pump )

Review MERCURY 50hp Stroke Bigfoot Fuel Pumps High And Low Pressure fits EFI 2006

The **Mercury X004D6 2006 50HP EFI Bigfoot High-Pressure Fuel Pump** is a precision-engineered component designed to deliver reliable, high-performance fuel delivery for Mercury outboard motors, particularly those equipped with Electronic Fuel Injection (EFI) systems. This fuel pump is specifically engineered for the **2006 50HP EFI Bigfoot** series, ensuring seamless integration with the engine s advanced fuel management requirements. Built to withstand the demands of marine environments, it features a robust construction with corrosion-resistant materials to prevent degradation from saltwater exposure, moisture, and harsh operating conditions. The pump operates using an electric motor that drives a high-pressure impeller, generating the necessary fuel pressure to optimize combustion efficiency and power output. Its compact yet durable design allows for easy installation within the engine s fuel system, minimizing space constraints while maximizing performance. The X004D6 model is engineered to maintain consistent fuel flow under varying loads, ensuring smooth acceleration, improved throttle response, and enhanced fuel economy critical factors for both recreational boating and demanding applications. Whether used in fishing boats, speedboats, or utility vessels, this fuel pump is a vital component for sustaining peak engine performance while extending the lifespan of the EFI system. Its compatibility with the **2006 50HP Bigfoot** model ensures that it meets OEM specifications, providing the reliability and efficiency required for dependable operation in all marine conditions.

### Pros and Cons of Buying Mercury X004D6 (2006, 50HP, EFI) Bigfoot Fuel Pumps (High-Pressure)

1. **High Performance and Reliability** The X004D6 is a well-regarded fuel pump designed for high-performance outboard engines, delivering consistent fuel flow under demanding conditions. The 50HP EFI variant is optimized for fuel-injected engines, which generally offer better throttle response and efficiency compared to carbureted setups.

2. **Durability and Build Quality** Mercury Marine is known for robust manufacturing standards, and the X004D6 is built to withstand the stresses of marine environments, including saltwater corrosion resistance (though proper maintenance is still required). The high-pressure design ensures reliable fuel delivery even under heavy loads.

3. **Compatibility with EFI Systems** Since this pump is specifically designed for electronic fuel injection (EFI), it integrates seamlessly with modern Mercury outboards, reducing the risk of fuel starvation or poor performance issues that can arise with mismatched components.

4. **Aftermarket Support and Availability** As a widely used part, the X004D6 is easy to find in the aftermarket, with multiple suppliers offering replacements, gaskets, and related accessories. This makes repairs and upgrades straightforward.

5. **Fuel Efficiency Improvements** High-pressure fuel pumps help atomize fuel more effectively, leading to better combustion and improved fuel efficiency in EFI engines compared to older carbureted systems.

6. **Long Lifespan with Proper Maintenance** When installed correctly and maintained (e.g., regular filter changes, fuel system cleaning), these pumps can last for tens of thousands of hours, making them a cost-effective long-term solution.

7. **Reduced Risk of Clogging** The high-pressure design helps push fuel through finer filters and injectors more effectively, reducing the likelihood of clogs that can plague lower-pressure pumps.

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1. **Higher Upfront Cost** Compared to basic fuel pumps, the X004D6 is more expensive due to its high-pressure design and compatibility with EFI systems. This may be a barrier for budget-conscious buyers or those working with older, lower-end outboards.

2. **Complex Installation** Replacing a fuel pump, especially in an EFI system, requires careful handling to avoid air locks, leaks, or improper priming. DIYers without mechanical experience may struggle, and professional installation can add to the cost.

3. **Fuel Quality Dependence** High-pressure pumps are more sensitive to contaminated or degraded fuel. Ethanol-blended fuels (common in many regions) can cause gumming, corrosion, or filter clogging over time, potentially shortening the pump s lifespan if the fuel system isn t properly maintained.

4. **Potential for Overheating** If the pump is not adequately cooled (e.g., insufficient airflow or improper mounting), it may overheat, leading to premature failure. This is less common but worth considering in enclosed or high-temperature environments.

5. **Limited Longevity in Poor Conditions** In extreme conditions (e.g., prolonged exposure to saltwater without flushing, lack of fuel stabilizers in stored boats), even durable pumps can degrade faster. Regular maintenance is critical to mitigate this risk.

6. **Compatibility Issues with Non-Mercury Engines** While the X004D6 is a high-quality pump, it is specifically engineered for Mercury EFI systems. Using it in non-Mercury outboards (e.g., Yamaha, Suzuki) may require additional modifications or could void warranties if installed incorrectly.

7. **Noise and Vibration Sensitivity** High-pressure pumps can generate more noise and vibration than standard pumps. If the mounting or fuel lines are not properly secured, this could lead to leaks or premature wear in adjacent components.

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The Mercury X004D6 (2006, 50HP, EFI) high-pressure fuel pump is a **strong, reliable choice** for owners of Mercury EFI outboards, particularly those seeking improved performance, fuel efficiency, and longevity. Its advantages in compatibility, durability, and aftermarket support make it a preferred upgrade for high-performance applications. However, the higher cost, installation complexity, and sensitivity to fuel quality and maintenance requirements mean it is not a "set-and-forget" solution. Buyers must be prepared for regular maintenance (e.g., fuel filtering, system cleaning) to maximize its lifespan.

For **new installations or major engine upgrades**, the X004D6 is highly recommended if budget and maintenance are not constraints. For **budget-conscious or DIY-challenged owners**, a lower-cost alternative (e.g., a standard-pressure pump or a compatible aftermarket option) might be more practical, though with potential trade-offs in performance and reliability.

- You own a Mercury EFI outboard (especially 50HP or higher).

- You prioritize performance, fuel efficiency, and long-term reliability.

- You are willing to invest in proper installation and maintenance (e.g., fuel system flushes, quality fuel, regular filter changes).

- You have access to professional help if installation is complex.

- You are working with a non-Mercury engine without verifying compatibility.

- Your budget is extremely limited, and you can tolerate slightly lower performance.

- You lack experience with fuel system maintenance or mechanical work.

- Your boat is frequently exposed to poor fuel conditions (e.g., old or contaminated fuel).

For most serious Mercury EFI outboard owners, the X004D6 is a **worthwhile investment** that pays off in performance and durability, provided it is installed and maintained correctly.

Details:

When I opened the system up it was very clean. I had just bought the boat and didn't know anything about this motor so it was better to what ordered parts changed fuel filter is new with two line zip ties. I have sold the boat $100.00 for all of them this motor ran fine when changed fuel system it had 215 hours on.

part #: x004d6 prices

• $37.99-$153.98

specifications ouboaen:

• for models: Efi
• for makes: Mercury
• for years: 2006
• mpn: X004d6
• part type: Fuel Pressure Pump

returns ouboaen:

• policy: No Returns

seller ouboaen:

• city: Republic, Missouri
• # reviews: 34
• rating: 100.0%

offer ouboaen:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• started: February 3, 2026
• quantity: 1

general ouboaen:

• condition: Used
• Boat Parts > Outboard Engines Components > Other

shipping ouboaen:

• cost: $10.21
• carrier: USPS
• type: Calculated
• class: Standard
• service: USPS Ground Advantage
• transit: 4-11 Days

payments ouboaen:

• credit card: Diners-club
• wallet: Google-pay
• other

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