While driving to work this morning I got on it and when I let off I looked down and the truck was dead like someone just turned the key off. Tried to start it again and nothing. Got it towed home and I cracked the 3 and 4 injector lines and cranked it, it bled fuel all on the ground I wasn't able to see it while cranking but fuel came out all on the ground. I tightened them back up and attempted to start and it started up. Shut it off and started it again and it fired right up. Any thoughts as to why this happened and will it happen again?