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Generac 3500iO / GP3500iO — Prepare Fuel System/Engine for Storage

Maintenance

For the Generac 3500iO / GP3500iO, from the Generac owner's manual.

Applies to: Generac 3500iO, Generac GP3500iO

Before you start

  • Eye protection required to avoid spray from spark plug hole when cranking engine
  • Store fuel in a well ventilated area, away from fire and sparks

Procedure

  1. Add fuel stabilizer, run engine 10-15 minutes to circulate stabilizer (fuel can then be stored up to 24 months)
  2. If not stabilized, drain fuel into approved container, run engine until it stops from lack of fuel
  3. Change engine oil
  4. Remove spark plug
  5. Pour tablespoon (5-10cc) of clean engine oil or spray fogging agent into cylinder
  6. Pull starter recoil several times to distribute oil
  7. Install spark plug
  8. Pull recoil slowly until resistance is felt, then gently release

Full service-parts list: Generac 3500iO →, Generac GP3500iO →

Source: Generac owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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