Red Line SI-1 Complete Fuel System Cleaner — 4 oz Concentrated Tank Treatment, Cleans Injectors & Prevents Corrosion

Red Line SI-1 Complete Fuel System Cleaner is a concentrated 4 oz fuel additive designed to clean and help prevent corrosion across fuel injectors, carburetors, valves and combustion chambers in a single tank treatment.

Keep modern and classic engines running cleaner with a laboratory-formulated additive that targets deposits and stabilizes gasoline. This compact 4 oz bottle treats a full tank, delivering detergents that dissolve gum, varnish and carbon buildup while protecting metal surfaces from corrosive attack. It’s suited for gasoline engines where cleaning deposits can restore responsiveness and help maintain emissions performance over time.

How does Red Line SI-1 remove deposits from injectors and carburetors?

The formula combines high- and low-temperature detergents that loosen and dissolve fuel varnish and carbon deposits. When added to a tank, these agents circulate with fuel to reach injectors and carburetor passages, breaking films and restoring spray patterns and idle quality.

• Concentrated detergent blend works across temperature ranges
• Targets injector tips, throttle bodies and carburetor jets
• One 4 oz bottle treats a full fuel tank for effective cleaning

Will this help engine efficiency and fuel economy?

Removing combustion-choking deposits improves fuel atomization and combustion consistency, which can translate into smoother running and potentially better miles per gallon. While exact gains depend on vehicle condition, the product improves fuel stability and reduces gum that hinders efficient fuel flow.

• Promotes more complete fuel burn through cleaner injectors
• Reduces formation of varnish and gum that impede flow
• Helps maintain exhaust system performance by reducing deposit-related emissions

How do I use the 4 oz bottle for best results?

Pour the entire 4 oz bottle into a nearly full tank of gasoline, then refill to mix the additive with fuel for one complete treatment cycle. Use as a preventive maintenance step or when symptoms of deposits appear, such as rough idle, hesitation or reduced throttle response.

• Use one 4 oz bottle per tank for most passenger cars and light trucks
• Best used with a full tank to ensure proper dilution and circulation
• Safe for most gasoline engines—follow vehicle manufacturer guidance

Who is this for? Red Line SI-1 is intended for drivers and technicians who want a compact, high-strength cleaner to restore fuel system cleanliness and reduce corrosion risk. It’s a practical choice for everyday commuter cars, performance vehicles, older engines with buildup, and anyone looking to maintain throttle response and combustion efficiency without disassembly. Use it as part of routine fuel system maintenance or before inspections to help ensure optimum engine operation.