my tank holds 33 gallons, would i have to fill it up only will 20 gallons after i pour in Max Clean or could i fill right up?

Put in a bottle & fill your tank 3/4 of the way up. That way you get the improved performance, but only have to buy one bottle. That's what I do as I have a 26 gallon tank.

How to use this ? Can I just put this to the fuel tank ?

Dump it in the fuel tank and fill it up with gas. This large can will treat up to 20 Gallons. I use it in my motorcycle, so I just put a small amount in. It also has a fuel stabilizer in it which is good cause I don't ride the bike that often.

Does this work in small gas engines?

What do u mean by small gas engines? Im running a 1500cc engine and works well with it. Is this small enough?

Does MaxClean come with the application funnel for capless fuel tanks like some of their other products?

It does come with a plastic funnel that attaches to the bottle. Depends what fuel your vehicle takes if it will work or not if it's a caplesss filler neck vehicle tho.

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Royal Purple Max-Clean Fuel System Cleaner and Stabilizer 11722 20 Ounce

Product ID: 1290602

Details

Brand
Royal Purple
Global Trade Identification Number
Item Weight
1.3 pounds
Number of Items
1
Unit Count
20 Ounce

⛽3.2% fuel economy boost

🌿Up to 18% emission reduction

🏎️2.6% horsepower increase

Description

🚀 Maximize your ride’s potential—clean, boost, and stabilize like a pro!

ECO FRIENDLY DRIVE - Cuts hydrocarbon, NOx, and CO emissions by up to 18%, making your ride cleaner and greener
PERFORMANCE AMPLIFIER - Unlocks an average 2.6% horsepower gain to keep you ahead on the road
UNIVERSAL COMPATIBILITY - Works seamlessly with gasoline, diesel, ethanol blends, and biofuels—fit for all your vehicles
TRIPLE ACTION POWERHOUSE - Cleans injectors, carburetors & combustion chambers for peak engine health
FUEL EFFICIENCY GAME CHANGER - Boosts your MPG by an average of 3.2%—because every drop counts

Royal Purple Max-Clean Fuel System Cleaner and Stabilizer is a premium 3-in-1 additive designed to restore and enhance engine performance by cleaning fuel injectors, carburetors, and combustion chambers. It improves fuel economy by 3.2%, increases horsepower by 2.6%, and significantly reduces harmful emissions, all while being compatible with gasoline, diesel, and biofuel engines. EPA and CARB compliant, it’s the trusted choice for millennial professionals seeking efficient, eco-conscious vehicle maintenance.

Specifications

ASIN	B00B1VBQRS
Best Sellers Rank	#14,909 in Automotive ( See Top 100 in Automotive ) #31 in Fuel System Cleaners
Brand Name	Royal Purple
Customer Reviews	4.7 4.7 out of 5 stars (3,330)
Global Trade Identification Number	00641330117220
Item Type Name	Fuel System Cleand and Stabilizer
Item Weight	1.3 pounds
Manufacturer	Royal Purple
Model Number	11722
Number of Items	1
Part Number	11722
Size	20 Ounce (Pack of 1)
UPC	641330117220
Unit Count	20 Ounce

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