Why won't my 2001 Buick Lesabre start?

I can hear the fuel pump run. I found a leak at the fuel rail at the top of the engine. I don't
know if that would cause enough of a pressure loss to keep it from starting. Also the
security light flashes. I believe it has for a long, long time though. One more thing I
thought was odd, i check the relay and fuses under the seat. When I did I unhooked the
battery just to see if it would kill the security flash. When I hooked it back up the left turn
signal arrow on the dash turned on steady. I put in the key and turned it forward and it
flashed quick like a bulb was burnt out even though that wasn't the case. I took the key
back out and a few minutes later the blinker flashed normal 5 or 10 times and the arrow
turned off.