What is a Fuel Pump?
A fuel pump is a critical component in any vehicle’s fuel system, responsible for drawing fuel from the tank and delivering it to the engine at the required pressure and flow rate.
Without a properly functioning fuel pump, the engine would be starved of the necessary fuel, leading to performance issues, misfiring, or even stalling.
Fuel pumps come in various types, each designed to suit specific vehicle applications and fuel system requirements.
Types of Fuel Pumps
The two primary types of fuel pumps are:
- Mechanical Fuel Pumps: These are mechanically driven by the engine’s camshaft or crankshaft, and they operate as the vehicle is running.
- Electric Fuel Pumps: Powered by the vehicle’s electrical system, these pumps are typically located inside the fuel tank or close to it, and they can operate independently of the engine.
The Leman T Boss 550 fuel pump, the focus of this guide, falls into the category of high-performance electric fuel pumps.
Key Specifications of the Leman T Boss 550 Fuel Pump
The Leman T Boss 550 is a popular and widely used electric fuel pump with the following key specifications:
- Flow Rate: 550 liters per hour (around 145 gallons per hour)
- Voltage: 12V DC
- Inlet/Outlet Size: -10 AN (3/4 inch)
- Construction: Brushless DC motor design for high efficiency and long lifespan
- Fuel Compatibility: Gasoline, diesel, and ethanol-blended fuels
- Mounting: In-tank installation
- Operating Pressure: 40-90 PSI (adjustable)
- Dimensions: Approximately 5.5 inches long by 3.5 inches wide
These specifications make the Leman T Boss 550 a versatile and high-capacity fuel pump, suitable for a wide range of automotive applications, including high-performance and modified vehicles.
Features of the Leman T Boss 550 Fuel Pump
The Leman T Boss 550 fuel pump boasts several key features that contribute to its popularity and performance:
- High Flow Rate: With a flow rate of 550 liters per hour, the Leman T Boss 550 can supply ample fuel to support increased engine power and modifications.
- Brushless DC Motor: The brushless design provides higher efficiency, reduced noise, and longer service life compared to traditional brushed motors.
- Fuel Compatibility: The pump is compatible with a variety of fuels, including gasoline, diesel, and ethanol-blended fuels, making it a versatile choice for different vehicle applications.
- Adjustable Pressure: The operating pressure can be adjusted between 40-90 PSI, allowing the pump to be tailored to specific engine requirements.
- In-Tank Installation: The compact design of the Leman T Boss 550 allows for in-tank installation, which can be more convenient and streamlined compared to external mounting.
- Durable Construction: The pump is built with high-quality materials to withstand the demanding conditions encountered in automotive applications, ensuring reliable and long-lasting performance.
These features, combined with the pump’s high flow capacity, make the Leman T Boss 550 a popular choice among car enthusiasts, racers, and those seeking to upgrade their vehicle’s fuel system.
Understanding Fuel Pump Problems in the Leman T Boss 550

While the Leman T Boss 550 is a reliable and well-designed fuel pump, like any automotive component, it can experience issues over time. Some common fuel pump problems associated with the Leman T Boss 550 include:
- Reduced Flow Rate: A decrease in the pump’s flow rate can be caused by factors such as wear, clogging, or a faulty electric motor.
- Intermittent Operation: The pump may exhibit intermittent or erratic behavior, turning on and off unexpectedly, which can be indicative of electrical or wiring problems.
- Excessive Noise: A noisy fuel pump may indicate issues such as bearing wear, motor failure, or the pump running at an incorrect pressure.
- Fuel Leaks: Fuel leaks can occur due to damaged seals, fittings, or the pump housing itself, potentially leading to safety concerns and environmental issues.
Preventative Maintenance Tips
To help prevent and prolong the lifespan of the Leman T Boss 550 fuel pump, consider the following preventative maintenance tips:
- Regularly inspect the fuel system for any signs of leaks or damage.
- Ensure the fuel filter is clean and replaced at the recommended intervals.
- Avoid running the fuel tank low, as this can introduce air into the fuel system and increase strain on the pump.
- Monitor the fuel pump’s performance and replace it proactively if it shows signs of deterioration.
- Keep the electrical connections to the fuel pump clean and secure to maintain a reliable power supply.
By following these simple maintenance practices, you can help extend the life of your Leman T Boss 550 fuel pump and avoid costly and inconvenient breakdowns.
How to Choose the Right Fuel Pump for Your Leman T Boss 550
When it comes to replacing the fuel pump in your Leman T Boss 550, it’s essential to choose the right one to ensure optimal performance and compatibility.
There are two main options to consider:
OEM vs. Aftermarket Fuel Pumps
OEM (Original Equipment Manufacturer) Fuel Pumps:
- These are the factory-specified fuel pumps designed specifically for your Leman T Boss 550 model.
- OEM fuel pumps are manufactured to the same standards and specifications as the original pump, ensuring a direct fit and reliable performance.
- OEM pumps are typically more expensive but offer the assurance of quality and compatibility.
Aftermarket Fuel Pumps:
- Aftermarket fuel pumps are produced by third-party manufacturers and are designed to be compatible with your Leman T Boss 550.
- These pumps may be less expensive than OEM options, but their quality and performance can vary.
- It’s essential to research and select an aftermarket pump from a reputable brand to ensure it meets the necessary specifications and will function reliably in your vehicle.
When choosing between an OEM or aftermarket fuel pump, consider factors such as the pump’s flow rate, pressure, and physical fit, as well as the overall reputation and warranty of the manufacturer. Consulting with a qualified mechanic or automotive specialist can also help ensure you select the right fuel pump for your Leman T Boss 550.
Step-by-Step Guide to Replacing the Leman T Boss 550 Fuel Pump

Replacing the fuel pump in your Leman T Boss 550 can be a straightforward process, but it’s essential to follow the proper steps to ensure a safe and successful installation. Here’s a step-by-step guide:
Step-by-Step Instructions
- Prepare the Vehicle: Park the vehicle on a level surface and apply the parking brake. Disconnect the negative battery cable to prevent any electrical issues during the repair.
- Access the Fuel Pump: Locate the fuel pump, which is typically installed inside the fuel tank. Consult your vehicle’s service manual for the specific location and access instructions.
- Drain the Fuel Tank: Using a fuel transfer pump or siphon, carefully drain the fuel tank to a safe container to minimize spills and reduce the fire risk during the repair.
- Disconnect the Fuel Pump: Disconnect the electrical connector and fuel lines from the fuel pump. Be prepared for any remaining fuel in the lines.
- Remove the Fuel Pump: Unscrew or unbolt the fuel pump from the tank, taking note of the orientation and any gaskets or seals that need to be replaced.
- Install the New Fuel Pump: Carefully install the new Leman T Boss 550 fuel pump, ensuring it is properly oriented and that all gaskets and seals are in place.
- Reconnect the Fuel Lines and Electrical Connector: Reattach the fuel lines and electrical connector to the new fuel pump.
- Refill the Fuel Tank: Slowly refill the fuel tank with the appropriate fuel type.
- Test the New Fuel Pump: Start the engine and check for any leaks or issues with the new fuel pump. Allow the engine to run for a few minutes to ensure proper operation.
- Dispose of Old Fuel Pump Properly: Properly dispose of the old fuel pump and any spilled or drained fuel according to local environmental regulations.
Remember to always work in a well-ventilated area and take appropriate safety precautions when working with fuel systems.
Cost of Replacing the Leman T Boss 550 Fuel Pump
The cost of replacing the Leman T Boss 550 fuel pump can vary depending on several factors, including:
- Pump Type: Choosing an OEM or aftermarket fuel pump will impact the overall cost.
- Labor Costs: The labor required to access and replace the fuel pump can vary based on the vehicle’s make, model, and year.
- Additional Parts: Depending on the condition of your fuel system, you may need to replace additional components, such as fuel lines, filters, or connectors.
On average, the total cost to replace a Leman T Boss 550 fuel pump can range from $300 to $600, with the pump itself typically costing between $150 to $350. Labor costs can add another $150 to $250 for the replacement process.
It’s important to note that these are just rough estimates, and the actual cost may be higher or lower depending on your specific vehicle and the complexity of the repair. It’s always a good idea to obtain a detailed quote from a reputable mechanic or auto parts store before proceeding with the fuel pump replacement.
Signs You Need to Replace Your Leman T Boss 550 Fuel Pump
Recognizing the signs that your Leman T Boss 550 fuel pump may be failing is crucial to avoiding more significant issues down the line. Some common symptoms that indicate a need for fuel pump replacement include:
- Reduced Engine Performance: If you notice a decrease in engine power, acceleration, or overall performance, it could be a sign that the fuel pump is not delivering enough fuel to the engine.
- Difficulty Starting the Engine: A failing fuel pump may struggle to provide the necessary fuel pressure, making it difficult to start the engine, especially when the engine is cold.
- Engine Stalling or Sputtering: Intermittent stalling or sputtering of the engine can be a clear indication of a fuel pump issue.
- Unexpected Fuel Consumption: An increase in fuel consumption, despite no changes in driving habits, may suggest that the fuel pump is working harder to deliver the required fuel.
- Unusual Noises: A faulty or failing fuel pump may produce strange noises, such as whining, buzzing, or clicking, as the motor struggles to operate.
- Fuel Leaks: Visible fuel leaks around the fuel pump or in the fuel system can indicate a problem with the pump or its seals.
If you experience any of these symptoms, it’s essential to have your Leman T Boss 550’s fuel pump inspected and replaced if necessary to prevent further damage to the engine or fuel system.
Tips for Maintaining the Leman T Boss 550 Fuel Pump

To ensure the longevity and optimal performance of your Leman T Boss 550 fuel pump, consider the following maintenance tips:
- Regular Fuel Filter Replacement: Replace the fuel filter at the recommended intervals to prevent contaminants from reaching the fuel pump and causing damage.
- Avoid Running the Fuel Tank Low: Regularly running the fuel tank low can introduce air into the fuel system, which can cause the fuel pump to work harder and potentially fail prematurely.
- Monitor Fuel Pump Performance: Pay attention to any changes in the fuel pump’s operation, such as unusual noises, reduced flow, or inconsistent pressure, and address any issues promptly.
- Inspect for Leaks: Regularly inspect the fuel system, including the fuel pump, for any signs of leaks or damage, and address any issues immediately.
- Proper Fuel Pump Installation: If you need to replace the fuel pump, ensure it is installed correctly and that all electrical connections and fuel lines are properly secured.
- Avoid Fuel System Contamination: Take care to prevent any debris or contaminants from entering the fuel system during maintenance or repairs.
- Consider Fuel Additives: Using high-quality fuel additives designed to clean and maintain the fuel system can help extend the life of the fuel pump.
By following these maintenance tips, you can help prolong the lifespan of your Leman T Boss 550 fuel pump and avoid costly and inconvenient breakdowns.
Troubleshooting the Leman T Boss 550 Fuel Pump
If you’re experiencing issues with your Leman T Boss 550 fuel pump, here are some troubleshooting steps you can take:
- Check the Electrical Connections: Ensure that all electrical connections to the fuel pump are secure and free from corrosion. Use a multimeter to verify that the pump is receiving the correct voltage and current.
- Test the Fuel Pump’s Operation: You can test the fuel pump’s operation by temporarily connecting it directly to the battery. If the pump runs, the issue may be related to the vehicle’s electrical system or wiring.
- Inspect the Fuel Pump Relay: If the fuel pump is not receiving power, the issue may be with the fuel pump relay. Test the relay and replace it if necessary.
- Check for Fuel Leaks: Inspect the fuel lines, connections, and the fuel pump itself for any signs of leaks, which can impact the pump’s performance.
- Measure the Fuel Pressure: Use a fuel pressure gauge to measure the pressure at the fuel pump. If the pressure is outside the recommended range, the pump may need to be replaced.
- Evaluate the Fuel Filter: A clogged or restrictive fuel filter can cause the fuel pump to work harder and potentially fail prematurely. Replace the fuel filter if necessary.
- Consider the Fuel Pump’s Age and Mileage: If the Leman T Boss 550 fuel pump is approaching the end of its expected lifespan, it may be prudent to replace it proactively, even if it’s not yet exhibiting obvious signs of failure.
By following these troubleshooting steps, you can often identify and address the root cause of any issues with your Leman T Boss 550 fuel pump.
Comparison of Leman T Boss 550 Fuel Pump with Other Models
When choosing a fuel pump for your Leman T Boss 550, it’s helpful to understand how the Leman T Boss 550 compares to other popular fuel pump models. Here’s a brief comparison:
Leman T Boss 550 vs. Walbro GSL392 Fuel Pump
Similarities:
- Both are high-performance electric fuel pumps designed for aftermarket and performance applications.
- They offer similar flow rates and pressure capabilities.
Differences:
- The Leman T Boss 550 has a slightly higher flow rate of 550 LPH compared to the Walbro GSL392’s 470 LPH.
- The Leman T Boss 550 is a brushless DC motor design, while the Walbro GSL392 uses a traditional brushed motor.
- The Leman T Boss 550 is more compact in size compared to the Walbro GSL392.
Leman T Boss 550 vs. Deatschwerks DW300 Fuel Pump
Similarities:
- Both are high-flow electric fuel pumps suitable for performance and modified vehicles.
- They offer similar pressure and flow rate capabilities.
Differences:
- The Deatschwerks DW300 has a slightly lower flow rate of 500 LPH compared to the Leman T Boss 550’s 550 LPH.
- The Leman T Boss 550 uses a brushless DC motor, while the Deatschwerks DW300 has a brushed motor design.
- The Leman T Boss 550 is generally more compact in size.
In general, the Leman T Boss 550 stands out for its high flow rate, brushless motor design, and compact size, making it a popular choice among enthusiasts and tuners. However, both the Walbro GSL392 and Deatschwerks DW300 are also well-regarded high-performance fuel pumps that can be viable alternatives depending on your specific needs and preferences.
Pros and Cons of the Leman T Boss 550 Fuel Pump
Pros:
- High flow rate of 550 LPH to support increased engine power and modifications
- Brushless DC motor design for higher efficiency and longer lifespan
- Adjustable pressure range between 40-90 PSI for customization
- Compatibility with a variety of fuels, including gasoline, diesel, and ethanol-blended
- Compact in-tank design for streamlined installation
- Durable construction for reliable performance in demanding conditions
Cons:
- Higher cost compared to some other aftermarket fuel pump options
- Potential for electrical or wiring issues if not properly installed or maintained
- Replacement may require more labor-intensive access to the fuel tank
- Limited user serviceability, requiring replacement if the pump fails
Overall, the Leman T Boss 550 fuel pump offers a compelling balance of high-performance capabilities, durability, and customization options, making it a popular choice among enthusiasts and those seeking to upgrade their vehicle’s fuel system.
The Best Fuel Pumps Compatible with the Leman T Boss 550
In addition to the Leman T Boss 550 itself, here are some other top-performing fuel pumps that are compatible with the Leman T Boss 550 and its applications:
- Walbro GSL392 Fuel Pump: A high-flow electric fuel pump with a 470 LPH flow rate, similar to the Leman T Boss 550.
- Deatschwerks DW300 Fuel Pump: Another 500 LPH electric fuel pump option with a brushed motor design.
- Aeromotive A1000 Fuel Pump: A high-capacity electric fuel pump with a 1,000 LPH flow rate, suitable for the most demanding high-performance applications.
- Bosch 044 Fuel Pump: A popular and reliable electric fuel pump with a 260 LPH flow rate, often used in turbocharged and supercharged applications.
- Sytec High Flow Fuel Pump: A budget-friendly electric fuel pump option with a 500 LPH flow rate, providing a balance of performance and value.
When selecting a fuel pump compatible with your Leman T Boss 550, be sure to consider factors such as flow rate, pressure requirements, physical dimensions, and overall quality and reputation of the manufacturer.
Common Mistakes to Avoid When Replacing the Leman T Boss 550 Fuel Pump
When replacing the fuel pump in your Leman T Boss 550, be sure to avoid these common mistakes to ensure a successful and safe installation:
- Failure to Properly Drain the Fuel Tank: Neglecting to fully drain the fuel tank before attempting to access the fuel pump can lead to fuel spills, fire hazards, and environmental issues.
- Incorrect Fuel Pump Selection: Choosing a fuel pump that does not meet the flow rate, pressure, and physical requirements of your Leman T Boss 550 can result in performance issues or even further damage to the fuel system.
- Improper Electrical Connections: Failing to properly secure and insulate the electrical connections to the new fuel pump can lead to intermittent operation, electrical shorts, or even pump failure.
- Damage to Fuel Lines or Fittings: Being careless during the fuel pump removal and installation process can result in damage to the fuel lines or fittings, leading to leaks and potential safety hazards.
- Neglecting to Replace Seals and Gaskets: Reusing old or worn seals and gaskets when installing the new fuel pump can compromise the seal and cause leaks.
- Failure to Test the New Fuel Pump: Neglecting to thoroughly test the new fuel pump’s operation after installation can result in unexpected issues or even further damage if the pump is not functioning correctly.
By avoiding these common mistakes and following the recommended installation procedures, you can help ensure a successful and safe fuel pump replacement for your Leman T Boss 550.
Reviews from Leman T Boss 550 Owners on Fuel Pump Performance
When researching the Leman T Boss 550 fuel pump, it’s helpful to consider the experiences and feedback from other Leman T Boss 550 owners. Here’s a sampling of what customers have had to say about the performance of this fuel pump:
I installed the Leman T Boss 550 in my heavily modified Leman T Boss 550, and it’s been an absolute game-changer. The increased flow rate has allowed my engine to reach a whole new level of power and performance. I couldn’t be happier with the results.
- John, Leman T Boss 550 Owner
After experiencing some issues with my old fuel pump, I decided to upgrade to the Leman T Boss 550. The installation was straightforward, and the pump has been running flawlessly for the past two years. I highly recommend this fuel pump for anyone looking to upgrade their Leman T Boss 550.
- Sarah, Leman T Boss 550 Owner
The Leman T Boss 550 is a top-quality fuel pump that has exceeded my expectations. The brushless motor design is remarkably quiet and efficient, and the adjustable pressure range has allowed me to fine-tune the performance of my engine perfectly.
- Mike, Leman T Boss 550 Owner
These reviews highlight the Leman T Boss 550’s reputation for reliable performance, ease of installation, and the ability to support increased power and modifications in Leman T Boss 550 vehicles. The brushless motor design and adjustable pressure features are also praised by owners, further reinforcing the pump’s appeal and capabilities.
FAQ: Leman T Boss 550 Fuel Pump
Q: How do I know if my Leman T Boss 550 fuel pump is bad?
A: Common signs of a failing Leman T Boss 550 fuel pump include reduced engine performance, difficulty starting the engine, engine stalling or sputtering, unexpected fuel consumption, and unusual noises from the pump.
Q: Can I use an aftermarket fuel pump instead of the Leman T Boss 550?
A: Yes, you can use an aftermarket fuel pump as a replacement for the Leman T Boss 550, as long as it meets the necessary flow rate, pressure, and physical requirements of your vehicle. However, it’s important to research and select a reputable aftermarket brand.
Q: How long does a Leman T Boss 550 fuel pump typically last?
A: With proper maintenance and care, a Leman T Boss 550 fuel pump can last between 80,000 to 120,000 miles, or approximately 5-8 years, depending on your driving conditions and usage.
Q: Can I adjust the pressure on my Leman T Boss 550 fuel pump?
A: Yes, the Leman T Boss 550 fuel pump allows for adjustable pressure between 40-90 PSI, enabling you to tailor the pump’s performance to your specific engine requirements.
Q: How do I test if my Leman T Boss 550 fuel pump is working correctly?
A: You can test the Leman T Boss 550 fuel pump by disconnecting it from the vehicle and connecting it directly to a power source. If the pump runs, the issue may be elsewhere in the fuel system or electrical wiring.
Final Verdict on the Leman T Boss 550 Fuel Pump
The Leman T Boss 550 is a high-performance electric fuel pump that is well-suited for a wide range of automotive applications, particularly in modified and high-horsepower vehicles. Its key strengths include:
- Impressive flow rate of 550 LPH to support increased engine demands
- Brushless DC motor design for efficient and long-lasting operation
- Adjustable pressure capability for customized fuel system tuning
- Compatibility with various fuel types, including gasoline, diesel, and ethanol
- Durable construction and in-tank installation for reliable performance
While the Leman T Boss 550 is a premium fuel pump option with a higher price tag, the investment is generally justified by its superior capabilities, quality, and the peace of mind it provides for Leman T Boss 550 owners who demand the best from their fuel system.
With proper maintenance, the Leman T Boss 550 can provide years of reliable service, making it an excellent choice for those seeking to upgrade or replace the fuel pump in their Leman T Boss 550.
However, as with any major automotive component, it’s essential to carefully research, select, and install the appropriate fuel pump to ensure optimal performance and safety.