Take out a spark plug after a failed start atemped. If its wet there is petrol of not there is non. Hold the spark plug against the engine while starting to see if there are sparks comming. If there are there is no prtrol if not its an electrical problem.
You can also pull of the tube of the carborator to chep if petrol is comming. If petrol is comming to the carborator but not out of it clean the jets inside. After 22 Jears everyday use i recently hat the same problem. After 30 Minutes she is running like new again
Edit: I just read that you found the problem allready. Great! Yes it sounds like a little dirt or that the pump is about to die slowly. I would replace it just in case. Its a known issue after 23 Years http://www.ebay.de/itm/Benzinpumpe-K...4AAOSwIclZhzNf
Good luck!!!
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