Yamalube Outboard Fuel Stabilizer & Conditioner Plus (ACC-FSTAB-PL-12) – 12 oz Bottle

Yamalube Fuel Stabilizer & Conditioner Plus is Yamaha’s alcohol-free outboard fuel stabilizer for ethanol-blended gasoline. Made for boats, WaveRunners, and other gas engines that sit between uses, it helps fight moisture, oxidation, and phase separation so fuel stays fresher, starts are easier, and storage-related deposits are less likely.

If you’re shopping for Yamalube Fuel Stabilizer and Conditioner 12 oz, this genuine Yamaha part number ACC-FSTAB-PL-12 is the yamaha yamalube outboard fuel stabilizer many owners use for routine protection and storage prep. It’s especially useful as a fuel stabilizer for ethanol-blended gasoline, including E10 and, where the engine manufacturer allows it, higher ethanol blends in non-outboard gasoline applications.

At a glance

• Part number: ACC-FSTAB-PL-12
• Size: 12 oz bottle
• Formula: Alcohol-free conditioner for gasoline fuel systems
• Best for: In-season tank treatment, storage over 2 months, and ethanol-related fuel protection
• Use on: Yamaha outboards, WaveRunners, generators, and other gasoline-powered engines

Why use a fuel stabilizer in a Yamaha outboard?

Modern gasoline can start breaking down in weeks, not months. Treating fuel regularly helps reduce the oxidation, moisture-related issues, and deposit buildup that can lead to rough running, hard starts, and clogged fuel passages during the season or after storage.

What it helps prevent

• Gum and varnish buildup caused by fuel oxidation
• Moisture-related corrosion risk inside the fuel system
• Storage headaches like hard starts, sticky passages, and dirty injectors or carburetors

Important: No fuel additive can bring already-stale fuel back to life or remove water that is already in the tank. If fuel is old or contaminated, address that first before treating fresh fuel.

How Yamalube Fuel Stabilizer & Conditioner Plus works

In plain terms, this alcohol-free formula fights moisture so it can help reduce oxidation and phase separation in ethanol-enriched gasoline. Used as part of a regular routine, it helps keep fuel fresh and helps reduce gum and varnish formation during use and storage.

How to use Yamalube Fuel Stabilizer & Conditioner Plus

Yamaha provides two treatment rates: one for normal in-season operation and one for storage over 2 months.

Quick answer

• Operational / in-season: 1 oz per 3 gallons of gasoline
• Storage over 2 months: 1 oz per 1 gallon of gasoline

Dosage quick chart

Fuel volume	Operational / in-season	Storage > 2 months
1 gallon	—	1 oz
3 gallons	1 oz	3 oz
6 gallons	2 oz	6 oz
9 gallons	3 oz	9 oz
12 gallons	4 oz	12 oz
15 gallons	5 oz	15 oz

When to use it

Scenario	Recommended use	Why it helps
Everyday boating / regular use	Treat every tank at 1 oz per 3 gallons	Helps keep fuel fresh and reduces oxidation-related deposits
Boat or equipment sits between trips	Use the operational mix rate consistently	Helps protect fuel that may otherwise degrade in a matter of weeks
Storage over 2 months	Use 1 oz per 1 gallon, then run the engine and top off the tank	Helps reduce condensation, oxidation, and storage-related fuel problems
Old or contaminated fuel	Do not rely on additive alone	Stale fuel and water contamination should be corrected before treatment

Best-practice steps

1. Add the correct amount of stabilizer to the tank or gas can.
2. Fill with fresh gasoline so the additive mixes evenly.
3. Run the engine for several minutes to circulate treated fuel through the system.
4. For storage over 2 months, top off the tank with treated fuel to help minimize condensation.

For broader fuel-system care, many owners pair this product with Yamalube Ring Free Plus as part of a regular maintenance routine.

Compatible with

• Yamaha outboards and WaveRunners
• Portable generators, small engines, and other gasoline-powered equipment
• Ethanol-blended and non-ethanol gasoline, always following the fuel limits set by the engine manufacturer

Ideal for

• Owners running E10 fuel who want a Yamaha-approved routine treatment
• Boats and PWCs that sit for days or weeks between trips
• Winterizing or preparing equipment for storage over 2 months
• Anyone trying to avoid hard starts, oxidation-related deposits, and moisture-driven fuel issues

Why it matters

Ethanol-blended fuel can attract moisture and break down faster than many owners expect. That can leave behind deposits, increase corrosion risk, and create frustrating starting or performance problems later. Using Yamalube Fuel Stabilizer & Conditioner Plus as part of your regular routine is a simple way to help protect your fuel system before those problems start.

Frequently Asked Questions

→ Can I use this with fuel that already contains ethanol, such as E10 or E15?
It is designed for ethanol-enriched gasoline. For Yamaha outboards specifically, follow Yamaha fuel guidance and do not use E15 or E85 in the engine.

→ How long does fuel stay fresh with this stabilizer?
When used as directed on an ongoing basis, it can help keep fuel fresh and free of gum and varnish for up to one year of storage.

→ Should I use it every fill-up or only before storage?
Routine treatment is the best approach. Use the operational mix rate for normal use, and switch to the storage mix rate when fuel will sit for more than 2 months.

→ Can I use too much fuel stabilizer?
It is best to follow the label mix rate for normal use versus storage. A small overdose is usually just wasteful, and topping up with fresh fuel helps bring the concentration closer to the intended range.

→ Is this for diesel engines?
This product is intended for gasoline fuel systems. Use a diesel-specific treatment for diesel equipment.