I put it in with a half tank still in the gas tank then filled up will that effect how well it works?

This Rislone stuff works REALLY well, especially if you've never used a fuel system cleaner to clean your fuel lines & intake. To get the maximum cleaning effect, you should run your tank down to 1/5 of a tank, and THEN put in the whole bottle and drive your car around until you get down to only 25 miles left and THEN, fill up to ONLY a 1/2 tank. This is my only "system" and it's not what they say to do on the bottle. In essence, when you put the bottle in, with 1/2 a tank and THEN, filled up.....you just diluted the strength of that 1 x bottle, by adding all the extra fuel. Try doing what I suggested and it will clean your fuel lines out very very well plus any carbon buildup within your intake or combustion chamber. Good Luck.

How does this work in a 2 stroke outboard boat engine?

Thank you for your question, and for considering using Rislone Gasoline Fuel System Treatment (part number 4700) in your 2 stroke outboard motor. This product was developed for use in the automotive sector, and has not been tested for use in marine applications. We sincerely appreciate your interest in this product, but are not able to recommend you use it for this type of application. If you have any other questions or we may be of further assistance, please feel free to contact our Tech Support Team at 1-800-345-6572. We are here to assist you Monday through Friday, from 8 am to 5 pm Eastern.

how come i was charged tax on a fuel treatment additive being sold by amazon...but not on other items being sold by other sellers

From my understanding it’s because the seller is in your state. When you buy product from seller or of state there are no taxes. That’s why the government is trying to pass new laws to be able to tax the products.

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⛽ Unlock peak performance and never settle for less on the road!

SMOOTH OPERATOR - Eliminates noisy injectors, rough idling, and hard starts for hassle-free driving
POWER UP YOUR DRIVE - Enhances octane, power, and fuel economy for a smoother, more responsive ride
FUEL EFFICIENCY CHAMPION - Engine tests prove improved mileage and reduced fuel consumption
ALL IN ONE FUEL SYSTEM SAVIOR - Combines injector cleaner, lubricant, stabilizer, dry gas, treatment & octane booster in one bottle
WARRANTY FRIENDLY ECO SMART - EPA registered formula that protects your engine without voiding warranties

Rislone 4700 Hy-per Fuel Complete Fuel System Cleaner is a powerful 16.9 oz multi-functional additive that cleans, lubricates, stabilizes, and boosts your fuel system. Designed for universal fit, it improves engine power, fuel economy, and smoothness while being EPA registered and safe for modern vehicles with oxygen sensors and catalytic converters.

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Brand	Rislone
Vehicle Service Type	Car
Flash Point	42.2 Degrees Celsius
UPC	078615047000
Automotive Fit Type	Universal Fit
Global Trade Identification Number	00078615047000
Manufacturer	Rislone
Size	1 Pack
Model	4700
Item Weight	1.09 pounds
Product Dimensions	3.2 x 3.6 x 8.4 inches
Item model number	4700
Is Discontinued By Manufacturer	No
Manufacturer Part Number	4700

Rislone 4700 Hy-per Fuel Complete Fuel System Cleaner, 16.9 oz.

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