98 silhouette doesnt run

My 98 is starting rough takes about 5 minutes to start and runs for like 1 minute and then dies out seems like a fuel problem but i replaced the injectors

Hello.Buy a fuel pressure gauge.Hook it up to schrader valve at the fuel rail. Turn key to on position.Gauge should read around 38-45 psi.If not,Perhaps you have a bad fuel pump.Good luck..Diesel 1962