As already said - the lift pump is a mechanical pump (as opposed to later models electric pumps).
i believe it works off a cam in the engine, (as AL203 said), as the engine is running, the cam is rotating and turning the pump.
I changed mine while the engine was out as it was said on here ages ago that (as Rougharse said) a knackered or worn pump can lead to a loss of performance and my defender was struggling at 50mph.
Obviousley its not out the garage yet so cant compare - but then the Alisport full intercooler and new radiator, new parts, tweeked as per Alisports instructions and soon to be rebuilt injectors - i might actually not know if the new lift pump is any better LOL
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