getting no fuel,how do I know if fuel filter is clogged,or fuel pump is out or

I pressed on the little air valve looking thing on the fuel rail and no fuel came out

then your fuel pump ids either no good or it is a clogged filter. sometimes they will run but no pressure. good test remove engine side of filter and turn key to run don't start, and have a pail handy if no fuel it could be the filter then try the other side. of course some vehicles don't have one in line