If the generator cranks over but no start, recall the basics, check fuel supply (I believe there is a lp shut off solenoid), check spark, check compression.
If it is not turning over, try to turn motor over manually, perhaps with ratchet on flywheel. If it turns over manually, perhaps your starter gave out.
My lp genset (marquis 6500) started shutting down when hot. I replace the coil and condenser and so far its been working properly.
Keep us updated on what you find. Good luck.
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