yet another fuel filter

ok changed fuel pump and filter .
mil light on at 4000rpm comp said problem was with low pressure fuel pump ect .
changed filter again 4000rpm mil on again.
saying same thing we have used 2 pumps and 2 filters .
its getting better will sometimes rev to 4400 no light then next time 4000 and mil on same fault ..
i no there's no need to rev it that high but it should go to 4800rpm with no mil or fault .
so if anyone can help that would be great thanks

:scratching_chin:

weak lift pump methinks.

chromiumuk said:

weak lift pump methinks.

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does mine have a lift pump and if so where is it and where can i get a new one ta