JohnsonEvinrude 24 Fuel Conditioner The JohnsonEvinrude 24 Fuel Conditioner protects the complete fuel system, conditions fuel, and extends the shelf life of fresh fuels. This fuel stabilizer is recommended for day-to-day operation, particularly during long periods of engine non-use. The 2 4 fuel conditioner extends the useful life of fuel in a number of ways. Metal deactivators render brass and copper alloy chemically inactive toward gasoline. Anti-oxidants in this formula slow the chemical bre