AirDog Fuel Pump Buyer's Guide: FP-100 vs FP-150 vs II-5G

If you own a diesel truck and you have not installed an AirDog fuel pump yet, you are leaving performance, fuel economy, and injector life on the table. We hear it all the time at NLP Performance here in Tampa, FL — a customer walks in skeptical, installs an AirDog lift pump, and comes back saying it is the single biggest improvement they have ever made to their truck. No tune required. No drama. Just cleaner fuel, better starts, and an engine that finally runs the way it should. In this buyer's guide, we are breaking down the entire AirDog product line so you can figure out exactly which model fits your truck, your budget, and your power goals.

What Is an AirDog Fuel Pump and Why Does Your Diesel Need One?

Here is the deal: your factory fuel system has a dirty little secret. Your stock lift pump uses a vacuum-side delivery system that actually pulls fuel from the tank. That vacuum can introduce air, water vapor, and debris into your fuel stream — all of which are murder on your injectors. Stock filtration runs somewhere between 10 and 30 microns. That sounds fine until you realize modern diesel injectors have tolerances measured in single-digit microns.

An AirDog fuel air separation system flips the script. It uses a gerotor pump to push fuel under positive pressure through a multi-stage process: first, air and vapor are separated from the fuel and vented back to the tank. Then the fuel passes through a 2-micron water-separating filter — that is 5 to 15 times finer than your stock filter. What reaches your injection pump is nothing but clean, air-free, water-free diesel. The result? Smoother idle, better throttle response, improved fuel economy (our customers consistently report 0.2 to 0.3 MPG gains), and injectors that can last the life of your engine instead of failing at 100,000 miles.

Think of it this way: your injectors are the most expensive wear item in your diesel. A set can run $2,000 to $4,000+. An AirDog fuel pump costs around $600 to $700 and protects that investment for the long haul. It is not just a performance mod — it is insurance.

AirDog FP-100 vs FP-150 — Which Flow Rate Do You Need?

This is the question we get asked most at our Tampa shop: “Do I need the 100 GPH or the 150 GPH?” The answer comes down to one thing — how much horsepower are you making (or planning to make).

FP-100 (100 GPH) — This is your go-to if your truck is stock to moderately modified. If you are running up to about 500-550 rear-wheel horsepower, the FP-100 has all the flow you need. It handles daily driving, towing, and moderate tuning without breaking a sweat. For the vast majority of diesel truck owners, this is the right call.

FP-150 (150 GPH) — If you are pushing past 550 RWHP, running aggressive tunes, or competing in sled pulls, step up to the FP-150. Its 3,000 RPM motor delivers 50% more fuel flow, ensuring your injection pump never starves under heavy demand. It costs only about $28 more than the FP-100, so if you are on the fence, the FP-150 is cheap insurance.

Here is a quick sizing guide:

• Stock to 550 RWHP: FP-100 (100 GPH) — plenty of flow, quietest operation
• 550 to 750+ RWHP: FP-150 (150 GPH) — extra headroom for big tunes and heavy towing
• Any power level + latest tech: AirDog II-5G — newest generation with boost compensation

AirDog II-5G — The Best AirDog Fuel Pump for 2026

The AirDog II-5G is the newest generation in PureFlow's lineup, and it represents a meaningful leap over the 4G series. If you are buying new in 2026 and your budget allows an extra $85 over the FP-150, the 5G is the one to get. Here is why:

Integrated diaphragm fuel pressure regulator — The 5G builds the pressure regulator directly into the unit, eliminating the external regulator that older models required. This means a cleaner install, fewer potential leak points, and more consistent fuel pressure delivery to your injection pump.

Boost-compensation capable — This is the big one for tuned trucks. The 5G can adjust fuel pressure based on boost levels, ensuring your injection pump always has the right amount of fuel pressure under load. Pair it with the AirDog Boost Compensation Kit and you have a fuel system that dynamically responds to your engine's demands.

Upgraded electrical — Larger porting, 12-gauge wiring, and weatherproof Metri-Pack 280 connectors. These are the kind of details that matter when your truck lives outside year-round or when you are running hard in summer heat.

AirDog vs FASS — Why AirDog Wins for Most Diesel Owners

Let us address the elephant in the room. FASS makes a great product, and we carry both brands at NLP Performance. But when our Tampa customers ask us which diesel lift pump to recommend, we lean AirDog for most applications. Here is the honest breakdown:

Both AirDog and FASS use 2-micron filtration and offer lifetime warranties for the original owner. Both do an excellent job of separating air, water, and debris from your fuel. The core technology is comparable. Where AirDog pulls ahead for the average diesel owner is in three areas: noise, build quality details, and price.

AirDog units are noticeably quieter in operation — something you will appreciate if you daily-drive your truck. They ship with thicker 20-foot fuel lines (not the thin stuff) and include an adjustable fuel pressure regulator. And they typically cost $50 to $100 less than the equivalent FASS unit.

Where FASS has an edge: if you are building a competition truck north of 800 HP and need 260+ GPH, FASS offers higher-flow options that AirDog does not match. They also have more product tiers for niche applications. For 95% of diesel truck owners, though, AirDog gives you everything you need at a better price.

AirDog vs Stock Fuel Pump — Is the Upgrade Worth It?

Short answer: yes. Long answer: absolutely yes, and here is why.

Your factory lift pump was designed to meet the bare minimum requirements at stock power levels. It uses coarse 10 to 30 micron filtration, delivers fuel via vacuum (which introduces air bubbles), and has no dedicated air/vapor separation. As your stock pump ages — or as you add power with a tune — it becomes the weakest link in your fuel system. Common symptoms of a failing stock lift pump include hard starting, rough idle, power loss under load, and eventually, catastrophic injection pump failure.

An AirDog fuel pump replaces this entire weak link with a purpose-built system that delivers clean, pressurized, air-free fuel. The 2-micron filtration alone is a game changer — it catches particles 5 to 15 times smaller than your stock filter. Add in the air separation and positive-pressure delivery, and you are protecting injectors that cost $250 to $500 each to replace.

At NLP Performance, we have seen trucks come through our Tampa shop where the owner spent $3,000+ on injectors because of fuel contamination that a $617 AirDog would have prevented. Do the math — this is one of the smartest investments you can make in your diesel.

How to Choose the Right AirDog for Your Truck

Picking the right AirDog comes down to three questions: What engine do you have? How much power are you making? And do you want the latest technology? Here are our vehicle-specific recommendations:

AirDog for Cummins (Dodge/RAM 5.9L & 6.7L)

The Cummins is the most popular platform for AirDog installations, and for good reason. The factory CP3 injection pump on these trucks is incredibly sensitive to fuel quality. For stock to moderately tuned Cummins trucks (up to ~550 RWHP), the FP-100 at $617.12 is the sweet spot. Installation typically involves a frame rail mount. If you are running bigger tunes or towing heavy loads frequently, step up to the FP-150.

AirDog for Duramax (Chevrolet/GMC 6.6L)

Duramax trucks benefit enormously from an AirDog because the factory fuel system on LB7, LLY, LBZ, and LMM engines is notoriously vulnerable to fuel contamination. The FP-150 is our most popular seller for Duramax trucks — the 01-10 model at $644.67 is a huge seller. Installation uses a frame jig that mounts in front of the fuel tank. For 2011+ Duramax trucks, we also carry year-specific FP-100 and FP-150 models.

AirDog for Powerstroke (Ford 6.0L, 6.4L, 6.7L)

Powerstroke owners, this one is for you. The 6.0L and 6.4L Powerstroke engines are infamous for fuel system issues. An AirDog replaces the factory low-pressure pump on the frame rail, giving you clean, positive-pressure fuel delivery that these engines desperately need. The 6.4L in particular is notorious for fuel-related injector failures — an AirDog can save you thousands in the long run.

AirDog Installation — What to Expect

One of the most common concerns we hear from customers at NLP Performance is: “Can I install an AirDog myself?” The answer is yes — but set realistic expectations for your first time.

Here are the typical install times we see:

• Professional shop: 2–3 hours
• Experienced DIY: 3–4 hours
• First-time DIY: 6–10 hours (take your time, it is not a race)

The installation process varies by truck:

Cummins (Dodge/RAM): Frame rail mount. Straightforward on most years, though some configurations may require dropping the fuel tank for routing the draw straw. Plan for the longer estimate on your first install.

Duramax (Chevrolet/GMC): Uses a frame jig that mounts in front of the fuel tank. Generally considered the most straightforward install of the three platforms. Good lighting and a lift or jack stands make a big difference.

Powerstroke (Ford): Replaces the factory low-pressure pump on the frame rail. The 6.4L install is well-documented and fairly clean. The 6.0L can be a bit tighter depending on the truck's exhaust and accessories.

Pro tip: After installation and after every filter change, you will need to prime the system. AirDog includes a priming procedure — follow it carefully. Skipping this step can result in air in the lines and a hard start on first fire-up.

Boost Compensation Kit — Worth the Add-On?

If you are running the AirDog II-5G and have a tuned truck, the Boost Compensation Kit is an accessory worth considering. It allows the AirDog to dynamically adjust fuel pressure based on your engine's boost levels. Under heavy load and high boost, fuel pressure increases automatically. At idle or light cruising, it dials back. This means optimal fuel delivery across the entire RPM and load range — not just a static pressure setting.