The pump is in the tank, and there can be one under the bonnet near the bulkhead if you have an early car.
It’s a filter that screws on to the housing, worth replacing if you haven’t done it.
If you only have a single pump system I’d look elsewhere for the issue as the single pumps rarely fail.
Maybe worth a trip back to Russ to see what T4 says.
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Lest we forget..
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