the ranger has a 2.3 mitsibishi turbo, the earlier ones had a 2.0 or a 2.2 cant remember but they were a perkins design mazda produced motor, the perkins/mazda was the better of the two motors from what i hear, due to timing chain on them opposed to belt on the mitsubishi, the escort was a mazda diesel they were good, as for the nissan/datsun they should be great little trucks as long as its not rusty because they rot bad and the frames snap, as for the pump it should be a nippon denso or a zexel most likely inline i will look into them a bit more and let you know what i find