Just go down to your local drug store or what ever and get some good old Isopropyl rubbing Alcohol, turn your truck car or buggy upsided down and drain out all the fuel then fill it about half way with Alcohol and shake the carp out of it with the lid closed. before your dump the alcohol out pull the fuel line off at the carb and the muffler and let it drain out a little. Do that as many times as it takes to clear out all the sediment or dirt if you will in your fuel system. I flush out my tanks with alcohol every time I put a model up........right after I put my after run oil in[:-]