[Scott Douglas]

My wife's '04 Mustang 3.8l wouldn't start for her today.
It ran fine as recently as Monday.
I checked the battery voltage first thing as it was suspect a few weeks ago when she said it wouldn't start for her then. It measured 12.3v.
When I went to start it this afternoon, it cranked just fine. It wouldn't crank for her at all this morning when she wanted to go to the store.
I pulled a plug and had her crank it while I checked for spark. It has a nice spark, nice and blue.
Will an OBD reader tell me if the fuel pump is having a problem?
I checked the fuel pump switch in the trunk and it was/is fine, ie not tripped.
I'm stumped as I'm old school (or should that be electronically challenged?), Chrysler Trouble Shooting Contest trained from high school. This new EFI stuff is great when it works but...
Any ideas from the trusted brain trust here would be appreciated.
Thanks.