Low oil level sending unit. These are known to leak. You can take the tank off, remove sender, clean the area good use silicone on sender, reassemble everything, and you will be good as new. I have had to do it to all of my Polaris's. There is a TSB out on this, can't find the #.
Anything stock pretty much sucks!
2001 Polaris 600xcsp(sks) 1.5 paddle
2002 Polaris 500xcsp 1.25 paddle
1996 Polaris Ultra SP
2000 Polaris XCR 120
2000 Ski Doo Formula 380
2000 Polaris trail blazer 250.
2001 Yamaha Big Bear 400
2000 Honda TRX 90
1995 Jeep Wrangler
2008 John Deere 2520, FEL, snowblower, cab