I have a Ryobi 2200 inverter generator. I was having some trouble getting it started. It took probably 6 pulls to crank. Once it finally started on the 6th pull, I noticed there was a lot of fuel leaking from the fuel line down into the engine. I shut off the engine. I waited bout 30 minutes then restarted the engine and it fired up on the second pull and there was no fuel leaking. What might have caused the fuel leak and is the generator safe to use?