We researched and compared the top lift pumps for the LBZ Duramax, evaluating them based on manufacturer specifications (flow rate, pressure, material quality), compliance with industry standards, and aggregated owner feedback from forums and verified purchasers. Our goal is to help you choose a pump that delivers reliable fuel pressure, protects your injection system, and offers solid value without overhyped claims. We did not physically test these products, but we analyzed spec sheets, safety certifications, and real-world user reports to separate the winners from the also-rans.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
FASS Fuel Air Separation System 165-GPH Best Overall 165 GPH flow, 15-20 psi, includes fuel/water separator and air removal |
9.2 | 🛒 Check Price |
 |
AirDog II 4G 165-GPH Runner Up 165 GPH, 15-18 psi, 2-micron filtration, air removal |
9.0 | 🛒 Check Price |
|
🚗
|
Kennedy Diesel Fuel Pump 165-GPH Best Value 165 GPH, 15-20 psi, gear pump with pressure regulator |
8.7 | 🛒 Check Price |
|
🚗
|
Pusher 165-GPH Lift Pump Solid Performer 165 GPH, 15-18 psi, gear pump, includes pre-filter |
8.4 | 🛒 Check Price |
|
🚗
|
Pace Performance Gear Pump 150-GPH Budget Pick 150 GPH, 12-15 psi, gear pump, no filter included |
7.8 | 🛒 Check Price |
|
🚗
|
S&S Diesel Motorsport 165-GPH Premium Build 165 GPH, 15-20 psi, gear pump, billet aluminum housing |
8.1 | 🛒 Check Price |
|
🚗
|
BD Diesel 100-GPH Lift Pump Compact Option 100 GPH, 10-12 psi, diaphragm pump, includes filter |
7.3 | 🛒 Check Price |
1. FASS Fuel Air Separation System 165-GPH: Best Overall
In our evaluation, the FASS 165-GPH stands out as the top performer for LBZ owners who want maximum protection for their injection system. Its integrated fuel/water separator and air removal technology is backed by manufacturer testing and positive owner feedback, with many reporting consistent fuel pressure and extended injector life. The anodized aluminum housing and quality internal components suggest long-term durability.
However, this pump is overkill for a completely stock truck that never sees heavy towing or performance tuning. The higher cost and slightly more complex installation may not be justified for owners who simply need a basic lift pump. If you are on a tight budget or have a mostly stock LBZ, a simpler electric pump might serve you better.
- Built-in fuel/water separator and air removal system protect injectors
- High 165 GPH flow rate supports stock and mildly modified LBZ
- Aluminum anodized housing resists corrosion
Pros: Excellent filtration and air separation; Durable construction with proven reliability
Cons: Higher initial investment than basic pumps
2. AirDog II 4G 165-GPH: Runner Up
The AirDog II 4G is a close competitor to the FASS, offering similar flow and filtration specs. Based on owner feedback, it delivers reliable fuel pressure and is noticeably quieter than many gear-style pumps. The 2-micron filtration is excellent for protecting sensitive LBZ injectors, and the powder-coated finish resists rust in harsh environments.
That said, replacement filter kits are more expensive than some competitors, and a handful of users reported minor mounting bracket fitment issues on early LBZ models. If you want a proven, quiet pump with top-tier filtration and don’t mind the filter cost, this is a great choice. Skip it if you prefer a simpler, lower-maintenance system.
- 2-micron absolute filtration and air removal
- Quiet operation compared to many gear pumps
- Corrosion-resistant powder-coated finish
Pros: Excellent filtration and quiet performance; Good customer support and warranty
Cons: Filter replacement cost adds up over time
3. Kennedy Diesel Fuel Pump 165-GPH: Best Value
In our research, the Kennedy Diesel pump offers the best balance of cost and performance for LBZ owners who already have a good filtration setup or plan to add a separate filter. It provides a reliable 165 GPH flow and consistent pressure, as reported by many users. The included regulator and check valve simplify installation, and the gear pump design is known for durability.
The main drawback is the lack of built-in filtration or air removal. If you run this pump without a high-quality pre-filter, you risk contaminating your injectors. Also, some owners noted that the pump is slightly louder than diaphragm-style units. Choose this if you are budget-conscious and have a separate filtration system; otherwise, consider an integrated solution.
- Affordable price point with solid performance
- Includes pressure regulator and check valve
- Simple bolt-on installation
Pros: Very competitive price for the flow rate; Easy to install with included hardware
Cons: No integrated filtration or air separation
4. Pusher 165-GPH Lift Pump: Solid Performer
The Pusher 165-GPH is a straightforward lift pump that gets the job done for many LBZ owners. It comes with a basic 30-micron pre-filter, which is better than nothing, but we recommend adding a finer filter for optimal injector protection. Owner reviews highlight consistent performance and easy installation, with the compact size making it a good fit for crowded engine bays.
On the downside, the included pre-filter is not sufficient for the LBZ’s sensitive injectors, and the pump lacks air removal capabilities. Some users reported that the check valve can stick after extended use. This pump is a solid choice for those on a moderate budget who plan to add their own filtration system. Skip it if you want an all-in-one solution.
- Includes 30-micron pre-filter for basic protection
- Compact design fits tight spaces
- Positive owner feedback on reliability
Pros: Good value with included pre-filter; Compact and easy to mount
Cons: Pre-filter is coarse; additional filtration recommended
5. Pace Performance Gear Pump 150-GPH: Budget Pick
The Pace Performance 150-GPH is a no-frills lift pump that can work for a stock LBZ that does not see heavy loads or performance modifications. Its low price makes it tempting, but based on owner feedback, it may struggle to maintain adequate fuel pressure under high demand, especially with larger injectors or towing. The lack of any included filter is a significant drawback for injector protection.
We only recommend this pump for owners who have a very tight budget and are willing to add a quality external filter and monitor fuel pressure closely. For most LBZ trucks, especially those used for towing or performance, we advise spending a bit more for a pump with higher flow and integrated filtration. Skip this if you value reliability over initial cost.
- Lowest price point among researched pumps
- Simple gear pump design with basic pressure relief
- Compact and lightweight
Pros: Very affordable entry-level option; Easy to install
Cons: Lower flow and pressure than LBZ ideal; No filtration included; must add separate
6. S&S Diesel Motorsport 165-GPH: Premium Build
The S&S Diesel pump is built like a tank, with a billet aluminum housing that resists corrosion and physical damage. It delivers solid 165 GPH flow and is a favorite among owners who are building custom fuel systems. The included AN fittings are a nice touch for those who want to use braided lines.
However, the premium price does not include any filtration or air separation, so you will need to invest in a separate filter setup. Also, the pump is relatively loud compared to diaphragm designs. This is best for enthusiasts who are building a high-performance fuel system and don’t mind the extra cost and effort. Skip it if you want a complete plug-and-play kit.
- Billet aluminum housing for extreme durability
- High flow supports moderate modifications
- Includes AN fittings for custom hose routing
Pros: Very robust construction; Good for custom fuel system builds
Cons: Higher price, no filtration included; Installation may require additional fittings
7. BD Diesel 100-GPH Lift Pump: Compact Option
The BD Diesel 100-GPH is a compact diaphragm pump that is easy to mount in tight spaces. It includes a basic filter, which is a plus for the price. Owner feedback indicates it works adequately for a completely stock LBZ that is not used for heavy towing. The quiet operation is a bonus for those who dislike gear pump noise.
However, the 100 GPH flow and 10-12 psi pressure are marginal for the LBZ’s fuel system, especially under load. Many owners report pressure drop at higher RPM, which can lead to injector damage over time. Diaphragm pumps also have a shorter lifespan than gear pumps. This pump is only suitable for very light-duty, stock trucks. Most LBZ owners should look for a higher-flow option.
- Very compact size fits tight engine bays
- Includes a basic fuel filter
- Quiet diaphragm operation
Pros: Small footprint and quiet; Includes filter for basic protection
Cons: Low flow rate not suitable for modified LBZ; Diaphragm less durable than gear pumps
Frequently Asked Questions
Do I really need a lift pump on my LBZ Duramax?
Yes, the LBZ Duramax is known for having a weak factory fuel system that can allow air and contaminants to reach the injectors. A lift pump provides consistent fuel pressure, removes air, and filters fuel, which can extend injector life and prevent expensive repairs. Based on owner feedback, it is one of the best upgrades for reliability.
What flow rate do I need for my LBZ?
For a stock or mildly modified LBZ, a pump with 150-165 GPH is ideal to maintain proper fuel pressure under all conditions. Lower flow pumps (100 GPH) may work for stock trucks but can struggle under load or with larger injectors. Higher flow is not needed unless you have significant engine modifications.
Should I get a pump with integrated filtration or add my own?
Integrated filtration (like FASS or AirDog) is convenient and ensures proper filtration from the start. Separate filtration gives you more flexibility but requires additional components and installation effort. For most owners, an integrated system is simpler and offers better protection out of the box.
Are gear pumps or diaphragm pumps better for the LBZ?
Gear pumps are generally more durable and provide higher flow and pressure, making them the preferred choice for the LBZ. Diaphragm pumps are quieter and cheaper but have a shorter lifespan and lower performance. We recommend gear pumps for long-term reliability.
Can I install a lift pump myself?
Many lift pumps are designed for DIY installation with basic tools. The process typically involves mounting the pump near the fuel tank, connecting hoses, and wiring power. However, some kits require cutting into fuel lines or modifying brackets. If you are not comfortable with fuel system work, professional installation is advised.
Our Verdict
After researching and comparing the available options, our top pick is the FASS 165-GPH for its proven filtration, air removal, and durability. The runner up is the AirDog II 4G 165-GPH, which offers similar performance with quieter operation. For budget-conscious owners who already have a good filtration setup, the Kennedy Diesel 165-GPH provides excellent value.
Last reviewed and spec-checked: May 15, 2026. We re-check our picks and listings periodically.
