1994 Mustang GT 5.0L wont start, need help

[ConfusedDude9888]

ok first of all, mustang was running great, no problems except for the EGR valve......I left for three days (car was sitting for 3 days) and when I came back home, I tried to start her up but she would not start. When I turn the key over to try and start it, battery instantly dies, and clicking sounds start coming from fuel tank (probably from fuel pump) and the little black box on the side of the coolant overflow resivour. While the clickin sounds are going on, I can put my finger on the the fuel line connecting to the Fuel Rail and I can feel a pulsating feeling, as if the fuel pump is tryin to pump (car is not running while this is happening) When I remove the key out of ignition, clickin sounds continue, and the tempature gauge and oil pressure guage goes to the max. When I put the key back in ignition, in the position before you start it, the temp. gauge and oil pressure gauge goes back down. Only way I can get the clickin sounds to stop, is to disconnect the battery, when I reconnect the battery clickin sounds start again. I have no clue as to what the problem is. please can anyone help me with this?

[ConfusedDude9888]

Also, I forgot to add,the check engine light blinks with the clicks

[K5Calamity]

I suspect that your ccrm (constant control relay module - the black box behind your coolant overflow tank) has an internal electrical failure