Red Line Fuel System Cleaner 15 oz (12-Pack) — Concentrated Injector & Carburetor Treatment

Red Line SI-1 Complete Fuel System Cleaner is a concentrated 15-ounce gasoline treatment formulated to clean injectors, carburetors, valves and combustion chambers when used one bottle per tank.

Designed for modern gasoline engines, this concentrated fuel additive restores cleaner fuel flow and helps reduce the buildup of gum, varnish and carbon deposits. Each 15-ounce bottle treats a full tank; this listing supplies twelve bottles for repeated or fleet applications. Red Line’s SI-1 blends high- and low-temperature detergents with stabilizing agents to help keep fuel fresh and fuel-system components free of deposits between service intervals.

How will Red Line SI-1 affect engine performance?

Using one bottle per tank can improve fuel spray patterns and combustion consistency by removing deposit layers that interfere with fuel delivery. Cleaner injectors and valves help restore throttle response and steady idle in affected vehicles.

• Removes injector and carburetor deposits for steadier fuel spray
• Reduces gum and varnish that impede fuel metering
• Helps maintain more consistent idling and throttle feel

How do I use a 15-ounce bottle of SI-1 for best results?

Pour one full 15-ounce bottle into a nearly empty fuel tank, then fill the tank with gasoline to mix the additive. For severe deposits, follow two consecutive fill-ups with an additive treatment; routine use as recommended keeps systems cleaner between services.

• Use one bottle per tank for standard treatment
• Add before filling to ensure rapid mixing with fuel
• Repeat one or two fill-ups for heavy deposit removal

Will this cleaner protect my fuel system or just clean it?

In addition to detergents that remove deposits, SI-1 contains stabilizers that slow gum and varnish formation and help maintain gasoline stability in storage. The combined formula addresses both cleaning and short-term preservation of fuel-system condition.

• Includes high- and low-temp detergents for broad deposit control
• Contains stabilizing agents to reduce fuel degradation
• Works on injectors, carburetors, valves and combustion chambers

Is Red Line SI-1 safe for modern emission systems and materials?

Formulated for use in gasoline engines, SI-1 is designed to clean without harming common fuel-system materials when used as directed. It is suitable for vehicles with catalytic converters and other emissions controls when applied at recommended dosages.

• Compatible with catalytic converters when used per instructions
• Safe for modern engine fuel-system components and seals
• Non-corrosive formulation intended for regular maintenance use

Who is this for: Red Line SI-1 Complete Fuel System Cleaner is aimed at vehicle owners, fleet managers and performance enthusiasts who want a concentrated, professional-grade gasoline treatment. It suits anyone looking to restore fuel delivery components between mechanical services—especially older vehicles showing deposit-related symptoms or machines stored seasonally that need fuel stabilization.