2008 chevy 5.3 not staying running?

Truck was running rough and it sat since last april I
decided to pull out fuel pump and clean it also fuel
pump is a year and a half old but the inlet was
clogged and a few other things were in the bottom
pulled off bottom cleaned strainer put it all
together put it back in truck and now it starts but
stalls out 30 seconds or less later... idk if it's a
security issue or a fuel pump reset or what help
please!!