Generac GT-760 / GT-990 — Long Term Storage / Fuel System
Maintenance
For the Generac GT-760 / GT-990, from the Generac owner's manual.
Applies to: Generac GT-990 engine
Before you start
- Never store engine with fuel in tank indoors
Procedure
- Remove all gasoline from the fuel tank
- Start and run engine until it stops from lack of fuel
- Drain oil from crankcase while warm and refill with recommended grade
- Remove spark plugs and pour about 1/2 oz (15ml) oil into cylinders, crank 2 seconds, then stop
- Install and tighten spark plugs, do not connect wires
- Clean generator outer surfaces and check cooling slots are clear
- Store unit in a clean, dry place
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.