The only proper way to check for fuel is with a gauge that connects inline. The pressure should build up to 60psi and hold 55psi or higher for a few minutes.
If you hear the pump run for a second or two when first turning the ignition on and the run/stop switch to run then you can pop the fuel tank disconnect and you should notice some pressure built up. This isn't a good way to test anything but it will tell you a little. Its obviously a little dangerous as fuel will spray around. I'd suggest finding a test gauge.
The key symbol is not just for security indication. If it is solid illuminated then it is indicating a trouble code in the turn signal module or cirucits. You can check for those codes via the speedometer. I can help you with those steps if you aren't familiar with it. Only the spark would be affected if there is an issue in the turn signal module so if you do have spark then the problem is likely somewhere else.
Try this first though. Remove the air filter cover and filter. Disconnect the plug from the throttle control motor (TCM) (located just behind and to the rear of the air filter backing plate. With a small screwdriver carefully wedge open the throttle plate very slightly. Try to start the bike. If it tries to start and seems that it wants to run then the problem is likely in that TCM or plug. It is a fairly common problem.
If it won't fire at all on the gasoline then try once again with the throttle plate wedged open to spray starting fluid and, if it fires, try to keep it running with short blasts of the spray. If this seems to work then you know you have a fuel supply issue.
If it acts the same way, running only for a second or so then losing spark and shutting down, then something has to be disabling the ignition. A problem within the turn signal module not allowing the ECM to recognize it will cause this. A diagnostic computer system will be needed to diagnose and fix that problem.
I hope this helps. Please let me know if I can be of further assistance. Also, please leave a positive rating for my service today. Thanks, P.J.