I know that the computer takes at least 10 volts but a good alt.
should put out 13.6... There fore the alt. should keep the engine running.. Unless there is a dead cell in the battery which caused a dead short.. It sounds like your experience it the exception rather than the rule.. But I understand your point.. Thats why I suggested checking the coil and fuel pressure .
SO you can be sure its the pump before you change it..
Just a thought.. With the dead cell did the starter drag .
I am just wondering how it could have started the vehicle ,which takes much more current , and then not be able to keep it running., which should take next to nothing from the battery..
Sounds a little strange.. But I guess stranger things have happened.