My S4 has been running fine this year. I’ve been out this spring on the few warm days there has been so far.  No problems at all.  Out of the blue, won’t start.  When I turn the key, everything indicates fine for power but fuel pumps not priming and nothing at all happens when I push ignition.  What could be faulty that would cause this?  I am thinking that the ecu senses something is not right.  I can think of plenty of situations where fuel pump won’t prime or ignition not working, but is there any problem common for both at the same time?

Update:  The 10amp ecu fuse was bad.  All is well again..

 

Bad as in blown?    If so I'd be asking myself why.