Full Force Diesel Injectors: The Complete Buyer's Guide for the 7.3L Power Stroke

If you own a 7.3L Power Stroke and you've started shopping injectors, you've run into the name Full Force Diesel, and probably a wall of confusing part numbers, CC ratings, and "stage" labels that nobody fully explains. This guide fixes that. By the end you'll know exactly what Full Force builds, which injector matches your power goal and supporting mods, what each set costs, and what else has to be in the truck before you bolt them in.

We've been selling and installing Full Force injectors on Ford Super Duties for years, so this isn't a spec sheet copied off a box. It's how to actually choose.

Who is Full Force Diesel?

Full Force Diesel Performance builds new and remanufactured fuel injectors for the Power Stroke, Cummins, and Duramax platforms. They've earned their reputation on the 7.3L Power Stroke specifically, where their hybrid injector designs and consistent flow-matched sets have become the default recommendation for OBS and Super Duty builds chasing 350 to 650+ horsepower.

Two things set them apart for the 7.3 crowd. First, flow matching: every injector in a set is calibrated to deliver the same volume, which is what keeps a high-mileage 7.3 idling smooth and pulling clean instead of stumbling and running rough. Second, the warranty: Full Force backs their injectors with an 18-month, unlimited-mileage warranty, which matters a lot on a part that lives in a brutal environment and isn't cheap to replace.

For the 7.3L Power Stroke, the injector is the single biggest fueling lever you have. The HEUI (hydraulically actuated, electronically controlled) system means your injectors do double duty: they're fired by high-pressure oil, and the nozzle and plunger size dictate how much fuel actually reaches the cylinder. Upgrade them correctly and you wake the whole truck up. Get them wrong and you'll fight high EGTs, poor drivability, and a no-start.

The Full Force 7.3L injector lineup, explained

Full Force organizes 7.3L injectors into stages. The stage tells you roughly how much power the set supports and how much supporting hardware you'll need. Use the selector below to filter by how you actually use your truck, and click any stage to see the full detail. The configurations shown are the ones we stock for the 1994-2003 Ford F-250/F-350 7.3L Power Stroke.

A few terms worth decoding so the part numbers stop looking like alphabet soup:

CC rating is the injector body's fuel volume: bigger CC means more fuel and more power potential, but also a higher demand on your turbo and oil system and more sensitivity to tuning. Nozzle percentage (the "30," "80," "100" in a part number like 205CC/80) is how far the nozzle is opened up over stock; a higher nozzle number atomizes more fuel for more power but needs tuning to keep combustion efficient. Hybrid means the injector mixes a larger nozzle with a smaller plunger (or vice versa) to get power without the drivability penalty of a full single-shot, which is why hybrids are the sweet spot for street trucks.

AA, AD, AE refer to factory injector codes. 1994-1997 OBS trucks use AA-style; 1999-2003 Super Duty trucks use AD, with the 1999 "early" trucks needing a long-lead injector in certain cylinders. This is the #1 fitment mistake people make: buying the wrong code for their year. (More on that below.)

How to choose the right Full Force injector

Forget the biggest-number-wins instinct. The right injector is the one that matches three things: your power goal, your supporting mods, and how you actually use the truck. Work through these in order.

1. Start with how you use the truck. If it's a daily driver or a tow rig, drivability and EGTs matter more than peak dyno number. A 7.3 hauling a trailer with oversized injectors and no tuning will make heat, not power. If it's a built play truck or competition piece, you can lean into the bigger single-shots.

2. Match the injector to your turbo and oil system. This is where most builds go sideways. Injectors above roughly 250CC need more high-pressure oil than a stock HPOP (high-pressure oil pump) can supply, and more air than a stock turbo can move. If you're running stock supporting hardware, stay in the Stage 1 to Stage 2 range. Going bigger without a turbo and HPOP upgrade just means high EGTs, turbo lag, and disappointment.

3. Add tuning once you pass Stage 1. Stock-nozzle Stage 1 injectors will run on factory programming. Anything with an opened-up nozzle (Stage 1.5 and up) wants custom tuning to control timing and fuel delivery; otherwise combustion stays inefficient and you won't see the power you paid for. Budget for a tuner in the same build.

4. Don't forget the under-valve-cover harness. On OBS 7.3s especially, the under-valve-cover (UVC) wiring harness is a known failure point and a common cause of injector-driver and misfire codes. If you're already pulling the valve covers to do injectors, replacing the UVC harness at the same time is cheap insurance. Full Force makes a direct OBS harness kit.

Our recommendations by goal

• "I just want my 7.3 to run right again." Reman stock injectors. Flow-matched, warrantied, and a massive improvement over a worn or contaminated factory set, without touching tuning or hardware.
• "Daily driver / tow rig, want more power without drama." Stage 1 (350HP) if you're staying stock-ish, or Stage 1.5 (380HP) for the best balance of power and clean drivability. This is the most popular pick for a reason.
• "Street truck, I want it to move and don't mind tuning." Stage 2 (400HP) with a tuner for strong midrange and clean street manners.
• "Built truck, turbo and tuning done, towing heavy and having fun." Stage 3 Hybrid in the 205-250CC range (425-525HP). The hybrids keep it streetable.
• "Max effort build." Stage 3 single-shots up to 400CC (650+ HP). Bring a built bottom end, a big turbo, and an upgraded oil system.

What else you need in the build

Injectors don't make power in a vacuum. To get the most out of a Full Force set (and to keep your 7.3 alive), plan for these supporting pieces:

• Tuning for anything past Stage 1, to control fuel and timing and keep EGTs in check.
• Turbo capacity: a stock turbo is fine through Stage 1.5/2; bigger injectors need more air.
• HPOP (high-pressure oil pump) capacity for larger injectors, which demand more oil volume to fire fully.
• Fuel supply: a healthy lift pump and regulated return system so your injectors actually get the fuel they're sized for.
• Exhaust: a free-flowing turbo-back exhaust to evacuate the extra fuel you're now burning and help keep EGTs down. (A Diamond Eye turbo-back is a popular 7.3 pairing.)
• Gauges: at minimum EGT and boost, so you can actually monitor the heat your new fueling makes.

Build the truck as a system and your injectors will reward you. Bolt big injectors onto stock everything and you'll be back to troubleshooting in a month.

Fitment: get your year and engine code right

This is the part that causes the most returns, so read carefully.

• 1994-1997 OBS 7.3L uses AA-style injectors and the OBS-specific UVC harness.
• 1999-2003 Super Duty 7.3L uses AD-style injectors.
• "Early" 1999 trucks need a long-lead injector in specific cylinders. Full Force offers reman stock sets that include the correct AE long-lead injector to cover this.
• Full Force also builds injectors for the 2003-2007 6.0L Power Stroke (155CC and 175CC reman options) if you've got the next-gen truck.

Full Force Diesel injectors: FAQ

Ready to build your 7.3?

We stock the full Full Force Diesel 7.3L Power Stroke lineup: stock reman sets, Stage 1, 1.5, 2, and the complete Stage 3 hybrid and single-shot range, plus the OBS under-valve-cover harness kit and single injectors for spot replacement. Every set ships with Full Force's 18-month unlimited-mileage warranty, and we'll price-match and ship free over $70.