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getting no fuel,how do I know if fuel filter is clogged,or fuel pump is out or on 2003 BMW 325i

could it be a fuel pressure regulater ,I do hear a hum at the engine when I turn key on but do not hear a hum at the tank.i poured gas in the intake and it started right up

Asked by for the 2003 BMW 325i
ck fuel pressure at eng if fuel pump is needed repl filter at the same time
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
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