98 GMC ECM B fuse keeps blowing

I have a 98 GMC 6.5 Diesel, today when i started it, it ran for about 5 minutes and then died, when i tried to restart it the glow plug light wouldn't come on, but the check gauges light was on. I started looking for blown fuses and i found the ECM B fuse was blown, so i replaced it. Tried starting again end it fired up, ran for about 20 seconds, and then died. The ECM B fuse blew again, after a few more trys the fuse kept blowing and here i am, any suggestions on what could be causing it and what to check?