if its not a lux - u can access the pump from the removable panel in the boot.

tip - use lots of wd-40 on all the bolts for the straps - i ened up having to angle grind them off and fit a new stud like in the hole as the tin plante that anchors the facotry nut snaps off cos its so rusty.

i believe the grp a GGR unit pumps 195 l/h and is a large unit that is twice the size of the std one, its actually one from a audi quatro - so ive been told