This past weekend I rode my 2003 Nomad 1500 to Shenandoah Valley. It has been running great and starting within a couple of seconds after pressing the starter button. On 3 different occasions during this trip it failed to start easily. I press the starter button for a few seconds and it didn't start. I'd have to repeat this many times before my bike would start. Once I almost ran the battery down. I'm thinking it may be a problem with the fuel pump (EFI). Any advice?