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sensitive fuel gauge and low fuel level warning light

  Focus RS + S3
the fuel gauge in my van has been strange since ive had it,

when i initially start the van (on a flat surface) it'll show the fuel as about a bar below what was in there before i turned the engine off, and as i travel up the road it'll gradually increase a fair bit,
is it normal for it to be so sensitive as my 182 one is nowhere near as bad?
also the low fuel light rarely comes on, if it does, within a few seconds it goes back off, and ive ran it pretty low on purpose to see if it works lol

is there any contacts that may need cleaning in the sender/pump or is it a case of just fill it with diesel and live with it?