Thanks for your replies guys,
well,I am pretty sure the filter is clogged,I had it in the shop for 10 days for transmission warranty call and X was returned to me with 19 kms left on the range estimate(f#$%,I would say) along stuck caliper and a bunch of fault codes stored...anyway,it was about 3 weeks ago.
I owe the X for 2 years and hadn't changed the filter myself yet,so there are some chances it wasn't replaced ever since the X was new.
About a fuel pump,I can hear it from time to time,shouldn't I? If it's that loud it should be an indicator of a bad filter or it's its normal operation ?
I am gonna get the filter ordered anyway,pity they are a bit costy .

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e53 '00 4.4i Oxford Green II Freshly rebuilt tranny(2nd one) and transfer case/front shaft
e70 '08 3.0si Sapphire Black cinnamon leather 7 seats
e61 '06 530XI Sports Touring Silver - SOLD