Don't try and start it on 4 year old gas you are asking for trouble. You need to drain the tank and lines of the old gas and refill with some fresh stuff. If you can't do that in the garage and need to move the car hook up a 6 gallon outboard fuel tank and bypass the cars currant fuel system completly.

I was looking at the insides of a set of carbs off a Merc outboard the other day. 18 month old gas was enough to clog them up with varnish to the point the motor wouldn't run.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200