MYTH: fuel additives can cure or prevent all issues from ethanol-blended fuel.
TRUTH: there is no practical additive that can prevent phase separation from occurring. The only practical solution is to keep water from accumulating in the tank in the first place. In addition to using high-quality fuel additives, you should purchase quality fuel from trusted sources, check fuel filters and fuel tanks periodically for sediment and water, and keep up with manufacturer-recommended preventative maintenance schedules.
MYTH: Fuel additives can make phase-separated fuel (that has separated into layers of water and low-octane gas) usable.
TRUTH: “Bad” fuel should be completely removed and replaced with fresh fuel. Nothing can rejuvenate old fuel. To prevent fuel from going bad, most manufacturers recommend high-quality fuel additives to prevent sediment, gum and varnish buildup that forms when fuel goes bad, control moisture, help prevent phase separation and prevent fuel system corrosion.