we are having trouble adding gas to the gas tank, i start pumping gas on the slow setting and it stops after 10 seconds, i have to add it super slow or i will not get any in the tank, it takes maybe 10 minutes to fill the tank, i removed the gas pipe and looked for an obstruction and found nothing also there wasnt anything in the hose that goes to the tank, not sure what is wrong, can you help me find the problem. thanks mike.