My CAR DIED!?!?

I got the problems down to three things, any the FUEL PUMP, the ALTERNATOR, or the BATTERY...

Help me figure which is probally the right one to fix first.

I be driving fine, then it run rough, then the driving power would reduce. THEN it died - All happened within less than a minute when the truck run rough. The electrical accessories died a second since the truck died. A few seconds after it died I started it subsidise up just fine and drove it home smooth - This happen 2 days ago. Yesterday I started it, but it would stall, then it would start, but run rough, consequently die a couple seconds subsequent.

So... it starts so I don't think its the battery-operated, but it dies so it might be the alternator. BUT when all this first happen, it felt close to the fuel pump died thats why it lost power and shut off. But the bits and pieces died before the engine did.
SO, NOW, I'M CONFUSED.

Help me digit which it is. Thanks
I will run tests to see if my lights and horn work, etc. but im indolent :)

How do I find my vehicle out...

Answers: Uhhhh........What do you drive?

ADDED:
Being the owner of a 1991 Chevy 2500 truck with 350 I know what the problem is.....(because I have to replace mine)
Your fuel pump took a dive on you. (the one in the tank)

GM fuel pumps suck..

ADDED: #2
It's NOT your mobile or alternator because you were competent to start it back up.

I live within Dallas, TX. Where can...

Your fuel pump is an electric motor. If you lose your power source you lose your fuel supply. If you do not enjoy a volt meter o your dashboard buy a cheap one and test the battery-operated with the saloon off. start the motor and test again. Off the battery-operated should read 12v when running with the alternator working it should read 14-15v.

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