not fully understanding all of what you are saying, so let me ask some basic questions.
did you get a
scan tool to check the obd port for any trouble codes?
how long have you had the car? since brand new or a recent used purchase?
if used, any maintenance records on the car?
any engine modifications?
what is the mileage?
if you bought recently used, has this always been happening since day one of ownership?
when you put the car into ON position, are you saying the fuse pops every time? the car is not supposed to be trying to turn over until you put it in the START position, so that is an issue right there if the car tries to start in the ON position
possible issues?
-petrol pump (high pressure)
-BCM issue?
-ECM issue
-wiring harness issue? relay issue in the IPDM?
does the car eventually start? are you pressing the accelerator when the car is trying to turn over?