Possible reasons not to start:
- Check the oil level.
These generators have a low oil level sensor that won't allow you to start it when there is no enough oil in the engine. Oil DOES evaporate (and leak) when left for several months.
There is a specific blink pattern of the control light that I don't remember, but is listed in the manual.
An oil change after a several months of storage is advisable anyway.
Try a starting spray. A good thing to have handy when you have rarely used internal combustion engines. Gas station sell them at extortive prices.
Simply an empty carburettor and pump. Just try harder - e.g. 10 x 5s attempts with ~30 seconds pauses in between.
A wasp or spider nest in the air filter/inlet. Clean accordingly.
A dried out gasoline in the carburettor.
The gasoline has ingredients that are not volatile, so it leaves behind a viscous oily substance that prevents the fresh gasoline from flowing into the carburettor and its dosing system. In the extreme cases the substance left after the evaporation is not really liquid and the carburettor needs removing and soaking in gasoline first, disassembly and cleaning or simply a replacement.
- A dried out gasoline in the fuel pump (at least EU2000 has one, not sure about EU3000). The effect is the same. The cure is disassembly and cleaning.
p.s. I have an EU2000 that I haven't started for more than a year.
Considering that I live in a country #3 in the Comrade Putin's TODO list, I will try to start it right now.
Thanks for the hint.
edit: Yes, I did try to start my generator and no, it did not start.
What I discovered:
The fact that you see a liquid on the bottom of the tank does not mean there is enough gasoline to be sucked by the pump. It happened that there is a spoonful of gasoline on the bottom.
Fresh premium gasoline is much easier to ignite than somewhat stale regular (the car I siphoned runs mainly on propane and the gasoline tank is topped once in 2-3 months)
The original spark plug has an iridium equivalent (CR5HIX) that is better in any regard, including the ease of starting. 10 euro well spent.