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The easiest way is to drop the Fuel Tank from its mountings as the hole under the back seat is not big enough for access. (check 1st tho as some people butcher the floor to it).

Escort cosworth Standard fuel pump is the one to use-but only if you intend to tune /modify your car, if not the standard one is fine, be sure its an RST one tho as the XR2i one isn't the same.