When your GMC diesel is called upon for heavy towing, long hauls, or demanding work, a reliable fuel pump isn’t a luxury—it’s a necessity. The factory unit can only handle so much, and upgrading or replacing it with a robust aftermarket option can be the difference between a truck that performs and one that leaves you stranded. The right fuel pump ensures consistent fuel pressure, protects your expensive injectors, and provides the power you need when you need it most.
Navigating the vast selection of aftermarket fuel pumps can be challenging. This roundup simplifies your search by highlighting ten of the best options for various GMC diesel applications. From direct OE replacements to performance-enhancing lift pump systems, we’ve compiled a list to help you find the perfect component to keep your truck running strong under the most demanding conditions.
Top Aftermarket GMC Diesel Fuel Pumps
- A-Premium Electric Fuel Pump Module Assembly with Sending Unit
- TSC10165G Duramax 6.6L Diesel Fuel Lift Pump System Kit
- DWVO Fuel Pump Assembly Replacement for 1988-1995 Chevy GMC
- Evan Fischer Fuel Sending Unit for 2001-2004 Silverado/Sierra
- ACDelco GM Original Equipment MU1613 Fuel Pump Module
- BOSCH 69496 OE Electric Fuel Pump
- Delphi MF0019 Mechanical Fuel Pump
- Dorman 601-225 Fuel Pump Relay Module for Select Models
- Dorman 601-241 Fuel Pump Relay Module for Select Models
- Airtex E8248M Master Fuel Pump Assembly
A-Premium Electric Fuel Pump Module Assembly with Sending Unit
This A-Premium assembly is a complete module solution designed for 2008-2010 Chevrolet Silverado HD and GMC Sierra HD models with the 6.6L Duramax engine. It includes both the fuel pump and the sending unit, which is responsible for accurate fuel level readings. This all-in-one design simplifies the replacement process, ensuring that both critical components are renewed simultaneously for maximum reliability.
Built to match OE specifications, this module is a direct fit replacement, requiring no modifications for installation. It is engineered to restore proper fuel pressure and volume, which is vital for the performance and longevity of your diesel engine. By replacing the entire assembly, you address not only a failing pump but also a potentially faulty fuel gauge sender.
TSC10165G Duramax 6.6L Diesel Fuel Lift Pump System Kit
For Duramax owners looking to enhance their fuel system’s performance and reliability, this lift pump kit is an excellent upgrade. It is specifically designed for 2001-2010 GM trucks with the 6.6L diesel engine. A lift pump provides positive pressure to the engine’s primary fuel pump, which can prevent cavitation and extend the life of costly fuel system components.
Constructed from reinforced, high-quality materials resistant to wear and high temperatures, this kit is built for demanding use. It meets or exceeds OEM standards and has been factory-tested to ensure a perfect match with your vehicle. Installing an aftermarket lift pump is a popular modification for diesel enthusiasts who tow heavy loads or have performance tuners installed.
DWVO Fuel Pump Assembly Replacement
This DWVO assembly is a reliable replacement for 1988-1995 Chevy and GMC C/K series trucks with gasoline engines, including the 1500, 2500, and 3500 models. It is designed to directly replace worn-out fuel system parts, helping to restore your vehicle’s original performance and fuel efficiency. The pump is a crucial component for maintaining proper engine operation.
A key feature of this pump is its upgraded fourth-generation turbo pump motor. This design is intended to provide optimal power and consistent fuel pressure, which helps expedite fuel atomization and can lead to faster engine startup. For owners of these classic GM trucks, this pump offers a modern, efficient solution for a critical engine system.
Evan Fischer Fuel Sending Unit
The Evan Fischer fuel sending unit is a targeted solution for 2001-2004 Chevrolet Silverado HD, Silverado 3500, GMC Sierra HD, and Sierra 3500 models equipped with the 6.6L diesel engine. This component is specifically responsible for measuring the amount of fuel in your tank and communicating that information to the fuel gauge on your dashboard.
If your truck is experiencing an inaccurate or non-functional fuel gauge, this unit is the likely culprit. Replacing the sending unit can restore an accurate fuel level reading, which is essential for planning refueling stops, especially during long hauls or when towing. It is engineered as a direct fit for a straightforward installation process.
ACDelco GM Original Equipment MU1613 Fuel Pump Module
ACDelco GM Original Equipment parts are GM-recommended replacement components for your vehicle’s original factory parts. The MU1613 fuel pump module is designed to deliver the same quality, reliability, and durability that your vehicle had when it was new. This is an excellent choice for owners who prioritize maintaining the original specifications of their GMC truck.
This module includes the fuel pump, level sensor, seal, float, and harness, providing a comprehensive solution. Its primary function is to ensure a reliable and consistent supply of fuel is delivered to the engine under all operating conditions. Choosing an ACDelco GM OE part offers peace of mind regarding fit, form, and function.
BOSCH 69496 OE Electric Fuel Pump
Bosch is a world-renowned manufacturer of automotive components, and this 69496 fuel pump is an Original Equipment product, meaning it is the same type of pump vehicles were built with when new. This ensures a perfect fit and superior performance without the higher cost of an OEM-branded package. It is compatible with a wide range of vehicle makes and models.
This pump features Bosch’s patented Turbine Pump technology, which is engineered to virtually eliminate fuel pulsation, reduce operating noise, and mitigate hot-start problems associated with older pump designs. It is built to operate reliably in extreme temperatures and under low-fuel conditions, contributing to an extended service life.
Delphi MF0019 Mechanical Fuel Pump
Delphi is a leading global OE manufacturer, and the MF0019 mechanical fuel pump brings over 80 years of engineering heritage into a replacement part. This frame-mounted mechanical unit is built to Delphi’s strict original equipment standards, ensuring quality and correct fitment for a reliable repair. Mechanical fuel pumps are typically found on older vehicle models.
This pump is designed to be a direct replacement for the original mechanical pump on applicable vehicles. Its robust construction is intended to provide dependable fuel delivery, leveraging Delphi’s extensive experience in fuel system technology. For classic truck restoration or repair, a Delphi part offers trusted performance.
Dorman 601-225 Fuel Pump Relay Module
The Dorman 601-225 is an OE FIX fuel pump relay module made for select Ford, Lincoln, and Mercury models. This module is a critical electronic component that controls the operation of the vehicle’s fuel pump. A failure in this module is a common issue that can prevent the fuel pump from receiving power.
This is an upgraded replacement that features enhanced internal hardware for greater reliability. Dorman has specifically increased the current capacity within the module to help prevent the transistor failure that often plagues the original equipment part. This design improvement aims to provide a longer-lasting, more durable solution.
Dorman 601-241 Fuel Pump Relay Module
Similar to the 601-225, the Dorman 601-241 is a fuel pump driver module designed as a direct replacement for the original equipment in certain Ford and Lincoln vehicles. It matches the fit and function of the original module to restore proper vehicle operation quickly and effectively. When this module fails, the vehicle may not start or may stall unexpectedly.
This module offers a plug-and-play installation, requiring no modifications or special tools, which makes it a accessible repair for many DIY mechanics. Dorman provides an original manufacturer quality part at a cost that is typically lower than sourcing a replacement from a dealership, offering both value and convenience.
Airtex E8248M Master Fuel Pump Assembly
Airtex is a well-known brand in the fuel system component market, and the E8248M Master Fuel Pump Assembly is designed as a complete unit for specific vehicle applications. A master assembly typically includes the pump, reservoir, filter, and level sensor, providing an all-in-one solution for a comprehensive fuel system renewal.
Replacing the entire assembly can be more efficient than replacing individual components, as it ensures that all wear-prone parts within the fuel delivery system are new and working in harmony. This can help prevent future failures and restore optimal fuel pressure and volume for engine performance. Always confirm vehicle compatibility before purchase.
Buying Guide: How to Choose the Right Aftermarket GMC Diesel Fuel Pump
When my stock fuel pump started showing its age, I knew I needed a replacement that could handle more than just my daily commute. If you’re looking for one of the 10 best aftermarket GMC diesel fuel pumps for demanding use, you’re probably in the same boat. The choice can feel overwhelming, but focusing on a few key areas will steer you in the right direction.
First, you absolutely must match the pump to your truck’s specific model, engine, and year. A Duramax LB7 has different needs than an L5P. Getting this wrong is an expensive mistake. I always double-check the manufacturer’s fitment guide and sometimes even cross-reference the part number with my old unit. Next, consider your performance goals. Are you running a stock truck, or do you have a tune and bigger injectors? For stock or mildly tuned trucks, a high-quality OEM-replacement pump is often perfect. But if you’re pushing significant horsepower, you need a pump designed for high flow. Look at the pump’s rated gallons-per-hour (GPH) or liters-per-hour (LPH) at a specific pressure. A pump that can’t keep up with your injectors will leave power on the table and can even cause engine damage.
The type of pump matters, too. Most factory-style replacements are lift pumps, but for serious performance, a compound system with a lift pump feeding an injection pump might be the way to go. I also pay close attention to the kit’s completeness. Does it include a new fuel filter, wiring harness, mounting hardware, and instructions? A more complete kit saves a ton of time and frustration during installation. Brand reputation is huge in the diesel world. I stick with manufacturers known for their reliability and customer support. A cheap, no-name pump might save you money upfront, but it won’t last and could fail catastrophically. Finally, think about the warranty. A company that stands behind its product with a solid warranty period gives me a lot more confidence in my purchase. It shows they believe in the durability of their parts, which is exactly what you need for demanding use.
FAQ
What are the signs my GMC diesel fuel pump is failing?
I usually notice a few key symptoms before a fuel pump gives out completely. The most common one is a loss of power, especially when you try to accelerate or go up a hill. The engine might hesitate, stumble, or even stall. You might also have a hard time starting the truck, as the pump isn’t building enough pressure. In some cases, you’ll hear a change in the sound of the pump itself—it might get louder, whine more, or sound strained. If you’re experiencing any of these, it’s a good idea to get your fuel pressure tested.
Can I install an aftermarket fuel pump myself?
This depends on your mechanical skill level and the specific pump kit. A simple in-tank pump replacement can be a messy but straightforward job for a seasoned DIYer. However, many performance lift pump kits require mounting an external pump, running new fuel lines, and wiring in a new electrical connection. This is more complex. If you’re comfortable with basic wrenching and electrical work, and you carefully follow the instructions, it’s doable. If you have any doubts, having a professional install it is the safest bet to avoid fuel leaks or electrical issues.
Do I need a high-flow pump for a stock truck?
For a completely stock truck that you use for normal driving and light towing, a high-quality OEM-spec replacement pump is usually sufficient. It’s designed to meet the factory engine’s demands. However, if you plan on any future performance modifications, or if you frequently tow heavy loads in hot weather, upgrading to a more robust aftermarket pump can be a smart, preventative investment. It provides a margin of safety and ensures your engine always has clean, well-pressurized fuel.
How important is fuel pressure for my Duramax?
It is critically important. Your diesel injection system relies on extremely high and consistent pressure to atomize the fuel properly for a clean burn. If the lift pump can’t supply the CP4 or CP3 injection pump with enough fuel at the right pressure, you risk damaging the expensive injection pump and injectors. Low fuel pressure can lead to poor performance, rough idle, increased emissions, and in severe cases, catastrophic engine failure. Maintaining proper fuel pressure is one of the most important things you can do for your diesel’s health.
What’s the difference between a lift pump and an injection pump?
Think of them as a team with different jobs. The lift pump is the “supply” pump. Its job is to pull fuel from the tank and deliver it to the injection pump at a low pressure, usually between 10-70 PSI. The injection pump (like a CP4 or CP3) is the “high-pressure” pump. It takes that fuel and ramps the pressure up to an incredibly high level—often over 20,000 PSI—before sending it to the fuel injectors. For demanding use, ensuring your lift pump can adequately supply your injection pump is the key to reliability and performance.