Stalling Issue

My 94 stalls just a few seconds after it starts up. Me and my dad have really no idea what it could be I was told by someone it could be the crankshaft sensor. It ran just fine until one day it just stalled once and then twice in a row the next day. Then it couldn't be ran for more then a few seconds without giving out. We tinkered around with it and managed to get it running just fine drove it around for 10 minutes starting and stoping slowing down, and turning it off and back up again no issues. Tried it again a few hours letter and it was back the way it was and nothing we did helped.

Welcome to AF. No mention of engine, but check the fuel pressure when the problem occurs.

sorry about that The engine is a 3100. And I'll check the fuel pressure this weekend.

We tried checking the fuel pressure but didn't have a gauge for it. But while trying to check it we discovered some thing. When the car turns on we can hear the fuel pump working, a few seconds later the fuel pump turns off then a few seconds later so does the car. We believe it to be the fuel pump now is there any thing else that might be wrong other then the pump?