On my gryphon programmer i ran a diagnostic check and it came up with Error P0148: fuel delivery error..? my truck would only start sometimes and now it doesnt start at all. Im thinking fuel pump? or maybe even fuel filter but i have no clue. Any ideas?

 

I assume you changed your fuel filter before...don't know what year truck you have, check that first and check the relay too.

 

I see you have an 05', check the FPCM first. If that checks out then if the fuel filter hasn't been done in awhile change it and check the fuel pressure.