Just went through this recently as the gas in my tanks was a few years old and almost full. Wasn't a fun process but necessary. It's on the bottom, in between the tanks closer to the left side of the car(diagram is backward from looking at the engine bay). It's a silver plug with an Allen head. 24 and 25 in the diagram. Image Unavailable, Please Login
Here's my experience even though I don't use Stabil in my car. At my house in Fl I keep a Generator at ready for a worst case scenario during one of my visits. Last year I came up during a blackout and needed the power to open the garage door. I couldn't get the generator to start. The jet in the fuel bowl was gummed up after only 8 months (last time I ran it). My neighbor brought his generator over to assist and suggested I add Stabil to prevent exactly that from happening. Cleaned it 2 days later and she ran. I sold it soon afterwards. Now I use a Firman (no affiliation) dual fuel and keep the fuel tank empty but connected to a full propane bottle. Starts every time.
The absolute simple and most reliable method of keeping a small engine carburetor from fouling due to old fuel is to run it out of fuel. For a generator, it almost certainly has a fuel shut off. Start the engine, and turn the fuel off. When the engine stops running, it will be completely out of fuel in the carb and the float bowl. That will stabilize the engine. As far as the fuel, the best thing to do is drain the tank. Barring that, using a fuel stabilizer will help. Old fuel is damaging to an engine. Best to leave the small engine without any fuel at all and it will last for a decade without degradation.
Since I’m back under the car I snapped a pic of it…it’s right in front of the Ac compressor Image Unavailable, Please Login