1996 Polaris 500 not getting fuel

I've searched the forum for a specific answer, but haven't gotten exactly the info i need to know. I'm very new to the snowmobile world, and a little familiar with small engine repair. I recently bought a 1996 Polaris 500 Trail for $100. Had sat for 3 years and doesn't run. A few weeks ago i also bought a 1998 indy 500, which runs beautifully. The 96 trail though, i'm not sure where the problem lies. The engine does fire when fuel is dumped in the cylinder. There is no fuel getting to the carbs, nothing even in the fuel filter. Is this indicative of needing a fuel pump rebuild? This may sound like a dumb question... but how does fuel even get to the filter for a first start in years? Is it pulled in everytime the recoil is pulled? Thank you guys very much

1996 Polaris 500 not getting fuel