2011 Silverado LS starting

[Jerporter]

It's only happened twice in the last month but when went to start my truck that has the 4.8 it cranked for about 5 seconds then stopped and when I turn the key again it started right up like its supposed to any ideas? Hopefully it's not the timing 

[Colossus]

Fuel pump and or fuel pressure regulator for starters..

[Jerporter]

That's exactly what it is colossus! I threw a code had it checked and it was the fuel pressure regulator you nailed that one on the head