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Generac — Preparation for Storage

Maintenance · Engine/Generator

From a Generac service manual covering: GN-190, GN-220, NP-30G, NP-40G. Check it applies to your exact model before use.

Applies to: Generac NP-30G, Generac GN-190 / GN-220 engine, Generac GN-220 engine

Before you start

  • If a gasoline fuel system and GASOHOL were used, turn off the fuel supply and let the engine run out of gas.

Procedure

  1. Start the engine and let it warm up.
  2. After engine is thoroughly warmed up, shut it down.
  3. While engine is still warm, completely drain the oil and refill with recommended oil.
  4. Attach a tag to the engine indicating viscosity and classification of the oil.
  5. Remove spark plug and pour about one ounce (15ml) of clean engine oil into the spark plug opening.
  6. Crank the engine several times to distribute oil, then install and tighten spark plug.
  7. Remove battery and store in a cool, dry room on a wooden board; never store on concrete or wood floor.
  8. Clean and wipe the generator exterior surfaces.

Full service-parts list: Generac NP-30G →

Source: Generac service 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.

More Generac repair guides →