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Sitting that long is never a good idea. It may be the LP regulator is low on pressure or bad. That would be the first thing to check. A new one is about $25 for a good Marshall regulator. Try that and see if it will fire up and run. If not, you probably need to get to a shop that has a good genset tech. Hope that proves helpful here. Please get back to me if you need more input from me here. All follow ups are included in our fee.
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?