Started p500 and putzed about 300 feet and it stalled. Restarted and traveled about 20 feet and stalled again and wouldn't start. I walk back to where I started and see an empty 1/2 gallon orange juice container. Go check the gas cap and sure enough it was loose and had some orange gunk on it. So 5 year old fessed up to helping me fill tank. Gotta love those grandkids! What do you suggest I do now. Can't find the darn owners manual and don't have a clue where fuel filter is or how to drain tank. Suggestions?