5 Best Additives for Water in Gas Tank [In 2025]

Keeping your vehicle’s fuel system free from water and corrosion is crucial for optimal performance and longevity. Water in the gas tank can lead to a range of issues, from engine misfiring to fuel line freezing. To combat this problem, there are several highly effective fuel additives on the market. In this comprehensive review, we’ll explore the top contenders and help you determine the best additive for your needs.

5 Best Additives for Water in Gas Tank Reviews

HEET Water Remover & Premium Gas Line Antifreeze

Overview

HEET is a trusted brand when it comes to removing water from fuel systems and preventing gas line freezing. Their Gas-Line Antifreeze and Water Remover is a versatile product that works in all four-cycle engines, including fuel-injected models.

Specs

• Removes water from the fuel system
• Prevents gas line freeze-ups
• Safe for gas and diesel engines
• Cleans fuel injectors

Pros

• Highly efficient at removing water from the fuel system
• Prevents rust and corrosion by absorbing excess moisture
• Safe for all four-cycle engines, including fuel-injected models
• Affordable and readily available

Cons

• May not be as effective in extremely cold climates for preventing gas line freezing

Customer Reviews

Customers find the HEET Gas-Line Antifreeze and Water Remover to be an effective solution for removing water from fuel tanks and preventing gas line freezing. Many report that it helps their engines run smoother and start more easily, especially in cold weather.

STAR BRITE Star Tron Enzyme Fuel Treatment

Overview

The STAR BRITE Star Tron Enzyme Fuel Treatment is a comprehensive fuel additive that addresses a wide range of issues, from ethanol-related problems to old fuel rejuvenation.

Specs

• Works in all engines and all fuels
• Prevents and cures most ethanol-related issues
• Stabilizes fuel up to 2 years
• Removes and prevents gum, carbon deposits, and varnish build-up
• Disperses water throughout the fuel as submicron-sized droplets
• Reduces smoke and emissions

Pros

• Comprehensive fuel treatment that addresses a wide range of issues
• Effective in preventing and curing ethanol-related problems
• Stabilizes fuel for up to 2 years, making it ideal for long-term storage
• Improves fuel economy and engine performance
• Easy to use, can be mixed with other fuel additives

Cons

• More expensive than some other fuel additives

Customer Reviews

Customers are highly satisfied with the STAR BRITE Star Tron Enzyme Fuel Treatment, praising its ability to keep engines running smoothly, even after prolonged periods of inactivity. Many report improved fuel efficiency and reduced emissions after using the product.

STA-BIL 360 Marine Ethanol Treatment & Fuel Stabilizer

Overview

The STA-BIL 360 Marine Ethanol Treatment & Fuel Stabilizer is specifically designed to protect marine engines from the harmful effects of ethanol-blended fuels and water contamination.

Specs

• Cleanses the entire fuel system, including fuel injectors, lines, and fuel pumps
• Provides industry-leading rust and corrosion protection for internal fuel system parts
• Optimizes fuel performance, contributing to enhanced gas mileage and improved engine power
• Stabilizes fuel for up to 12 months

Pros

• Effectively cleans and protects the entire fuel system
• Prevents rust and corrosion, ensuring long-term engine health
• Improves fuel efficiency and engine performance
• Stabilizes fuel for up to 12 months, making it suitable for long-term storage

Cons

• Primarily designed for marine applications, may not be as effective in other types of engines

Customer Reviews

Customers highly recommend the STA-BIL 360 Marine Ethanol Treatment & Fuel Stabilizer, reporting that it keeps their boat engines running smoothly and prevents fuel-related issues. Many appreciate its ability to maintain fuel freshness and protect against corrosion.

Red Line 60103 SI-1 Complete Fuel System Cleaner

Overview

The Red Line 60103 SI-1 Complete Fuel System Cleaner is a concentrated blend of high-temp and low-temp detergents designed to clean and prevent corrosion in fuel systems.

Specs

• Cleans injectors, carburetors, valve, and combustion chamber deposits
• Enhances fuel stability and reduces gum and varnish formation
• Reduces the need for octane by up to two points
• Contains synthetic upper cylinder lubricant
• Suitable for use with oxygenated fuel

Pros

• Highly effective at cleaning and maintaining the entire fuel system
• Enhances fuel stability and reduces harmful deposits
• Helps improve engine performance and fuel efficiency
• Safe for use with oxygenated fuels

Cons

• More expensive than some other fuel system cleaners

Customer Reviews

Customers report that the Red Line 60103 SI-1 Complete Fuel System Cleaner works exceptionally well, keeping their engines running smoothly and improving fuel efficiency. Many appreciate its ability to clean and protect the entire fuel system, including injectors and combustion chambers.

STA-BIL In-Season Protection Fuel System Treatment

Overview

The STA-BIL In-Season Protection Fuel System Treatment is a comprehensive fuel additive that helps maintain the health of your vehicle’s fuel system throughout the year.

Specs

• Cleanses the entire fuel system, including fuel injectors, lines, and fuel pumps
• Provides industry-leading rust and corrosion protection for internal fuel system parts
• Optimizes fuel performance, contributing to enhanced gas mileage and improved engine power
• Stabilizes fuel for up to 12 months

Pros

• Effectively cleans and protects the entire fuel system
• Prevents rust and corrosion, ensuring long-term engine health
• Improves fuel efficiency and engine performance
• Stabilizes fuel for up to 12 months, making it suitable for long-term storage
• Can be used in combination with STA-BIL Storage for year-round protection

Cons

• May not be as effective in extremely cold climates for preventing gas line freezing

Customer Reviews

Customers highly recommend the STA-BIL In-Season Protection Fuel System Treatment, praising its ability to keep their engines running smoothly and improve fuel efficiency. Many note that it effectively protects against the harmful effects of ethanol-blended fuels and helps extend the life of their fuel systems.

Buying Guide

HEET Water Remover & Premium Gas Line Antifreeze

• Specs:
  • Removes water from the fuel system
  • Prevents gas line freeze-ups
  • Safe for gas and diesel engines
  • Cleans fuel injectors
• Pros:
  • Highly efficient at removing water from the fuel system
  • Prevents rust and corrosion by absorbing excess moisture
  • Safe for all four-cycle engines, including fuel-injected models
  • Affordable and readily available
• Cons:
  • May not be as effective in extremely cold climates for preventing gas line freezing

STAR BRITE Star Tron Enzyme Fuel Treatment

• Specs:
  • Works in all engines and all fuels
  • Prevents and cures most ethanol-related issues
  • Stabilizes fuel up to 2 years
  • Removes and prevents gum, carbon deposits, and varnish build-up
  • Disperses water throughout the fuel as submicron-sized droplets
  • Reduces smoke and emissions
• Pros:
  • Comprehensive fuel treatment that addresses a wide range of issues
  • Effective in preventing and curing ethanol-related problems
  • Stabilizes fuel for up to 2 years, making it ideal for long-term storage
  • Improves fuel economy and engine performance
  • Easy to use, can be mixed with other fuel additives
• Cons:
  • More expensive than some other fuel additives

STA-BIL 360 Marine Ethanol Treatment & Fuel Stabilizer

• Specs:
  • Cleanses the entire fuel system, including fuel injectors, lines, and fuel pumps
  • Provides industry-leading rust and corrosion protection for internal fuel system parts
  • Optimizes fuel performance, contributing to enhanced gas mileage and improved engine power
  • Stabilizes fuel for up to 12 months
• Pros:
  • Effectively cleans and protects the entire fuel system
  • Prevents rust and corrosion, ensuring long-term engine health
  • Improves fuel efficiency and engine performance
  • Stabilizes fuel for up to 12 months, making it suitable for long-term storage
• Cons:
  • Primarily designed for marine applications, may not be as effective in other types of engines

Red Line 60103 SI-1 Complete Fuel System Cleaner

• Specs:
  • Cleans injectors, carburetors, valve, and combustion chamber deposits
  • Enhances fuel stability and reduces gum and varnish formation
  • Reduces the need for octane by up to two points
  • Contains synthetic upper cylinder lubricant
  • Suitable for use with oxygenated fuel
• Pros:
  • Highly effective at cleaning and maintaining the entire fuel system
  • Enhances fuel stability and reduces harmful deposits
  • Helps improve engine performance and fuel efficiency
  • Safe for use with oxygenated fuels
• Cons:
  • More expensive than some other fuel system cleaners

STA-BIL In-Season Protection Fuel System Treatment

• Specs:
  • Cleanses the entire fuel system, including fuel injectors, lines, and fuel pumps
  • Provides industry-leading rust and corrosion protection for internal fuel system parts
  • Optimizes fuel performance, contributing to enhanced gas mileage and improved engine power
  • Stabilizes fuel for up to 12 months
• Pros:
  • Effectively cleans and protects the entire fuel system
  • Prevents rust and corrosion, ensuring long-term engine health
  • Improves fuel efficiency and engine performance
  • Stabilizes fuel for up to 12 months, making it suitable for long-term storage
  • Can be used in combination with STA-BIL Storage for year-round protection
• Cons:
  • May not be as effective in extremely cold climates for preventing gas line freezing

FAQs

1. How often should I use a fuel additive to remove water from my gas tank?
It’s generally recommende