1995 buick lasabre fuel problems

hi yes I am working on a 1995 buik lasabre i have to straight wire the fuel pump but it only runs for 30 seconds and dies (i found both the fuel pump relays gonna replace both of them and i have replaced the fuel filter) is the fuel injectors running off of one of the fuel pump relays or does it run off of something of its own relay or what? i need some more info on it im lost now and dont know what else could be wrong with it. it gets gas at the fuel rails but hesatates and doesnt stay running after 30 seconds, any help would be nice thanks