The high alcohol level in flex fuel pulls the water into the fuel and holds it tightly. Pure alcohol and water will mix to form a clear uniform solution in all concentrations. North American fuels contain only about 10% alcohol, so most of the fuel is hydrocarbon. A small amount of water will mix clearly […]

Probably not but in hot, humid coastal climates phase separation can begin within a week. If you are constantly driving the vehicle though, the risk is very low.

No. When used as directed, Gumout fuel additives will not degrade or harm oxygen sensors, catalytic converters, hoses, fuel lines or fuel level sensors.

All Gumout fuel additives include specific directions for use. But each product has also undergone rigorous “no harm” testing and can be used as often as every fill-up. Our usage recommendations for each product are based on testing in a number of different vehicle types, though the benefits in your vehicle may vary. For best […]

The treatment rates vary depending on the product. All additives have directions on the back label. They may also be used in about the same proportions in smaller fuel tanks. However, any additive added to 2-cycle fuel is treating the gasoline, not replacing the oil. Add the full amount of oil recommended by the engine […]

Using Gumout fuel additives when your tank is nearly empty facilitates better mixing with the fuel and allows you to get the most from the product chemistry due to longer use at the recommended concentration. If you use a Gumout fuel additive when your tank is full, it will just take longer for the additive […]

While we recommend using our fuel additives as directed, each product has been through rigorous “no harm” testing and may be used as often as every tankful. However, a stronger concentration of the product may not provide any additional performance benefit over the recommended dosage.

Most of our products are intended to be used within 1-2 years. We cannot guarantee the performance of our chemical products if older than 4 years.

Yes.

Gumout Multi-System Tune-Up is recommended for use in all types of engines. Other Gumout fuel additives may be used at the recommended dilution rate in the gasoline. For example, the 6 oz Regane Complete Fuel System Cleaner treats 21 gallons. To five gallons, use 1.5 oz – or ¼ of the bottle. The rest may […]