k3 gsxr 750 electrical issue
 

I just got a gsxr 750 and I have an issue I have no fuel pump power the dash is spitting check at me but I probe the two wire connector and got no response the battery is
garbge I know it will not hold any charge I have checked the TO and it was bad I pulled it out I disconnected the side stand switch. Checked the kill switch but the weird thing is if I roll on the throttle and crank on the starter button bike will start and die. I am sure it dies due to lack of fuel pressure any help will be good help