How to Replace Fuel on a Ryobi Trimmer


Ryobi makes three types of trimmers. One of them is electrically powered, which means it has no fuel source. The other two types are gasoline powered trimmers that require either a 2-cycle gasoline and oil mixture, or a 4-cycle engine that takes regular pump gasoline. The correct fuel replacement is critical for each type of gasoline powered trimmer, and incorrect fuel replacement could lead to a catastrophic failure of the engine.

Step 1

Determine what type of Ryobi gasoline powered trimmer you have. The 4-cycle version will be clearly marked on the engine compartment in bold and easy to see letters and numbers. The 2-cycle, which is the more common of the trimmers, will generally have an embossed marking saying "2-cycle" on the gasoline cap.

Step 2

Pour pure gasoline, straight from the pump or out of your gas can, into your 4-cycle engine's fuel tank. All gas cans come with a funnel extension which will fit inside of the tank and allow easy pouring with little or no dripping.

Step 3

Mix gasoline for your 2-cycle trimmer with 2-cycle oil before you fill your gas tank. Ryobi 2-cycle trimmers take a 32-to-1 gas to oil mix. Add 4 oz. of oil to 1 gallon of gasoline, then agitate the gas and mix them together for about 60 seconds. Mixing oil with the gas is crucial because 2-cycle engines get all of their lubrication from the oil/fuel mixture. Leave the oil out, and your engine will burn out within minutes.

Things You'll Need

  • 1 gallon gas can filled with regular gasoline
  • 2-cycle Ryobi oil or equivalent 2-stroke engine oil


  • Ryobi Tools: 2-Cycle Trimmer
  • Ryobi Tool: 4-Cycle Trimmers
  • Hammerwall: Ryobi Manual for 2-cycle Engine--Section 9, 32 to 1 Fuel Mixture
Keywords: ryobi, 2 cycle fuel, 4 cycle engine, 32 to 1, trimmer gas tank

About this Author

Dale Y the Maintenance Guy, has been involved with do-it-yourself projects, household and auto maintenance, property management and worked as a consultant with home and industries, while running a successful home repair business for more than 25 years. His written work has appeared in the "Lacrosse Tribune," "Women's Day," "New Home Journal," and on many DIY websites across the Internet.