I have a 2008 Polaris Sportsman 500 HO ATV. In the past year or so, the original fuel pump went out and I've replaced it twice myself, and once by a local ATV shop. Now the fourth pump is out. I only get about 2-5 starts out of a new pump before it burns up. The main symptom is that the pump does not start when the key is turned on. There is no sign of overcurrent or anything like that. Does anyone have any idea what could be a place to start looking?!?!