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I fitted this mechanical fuel pump to my year 2000 1kzte and it's from a daihatsu fourtrack. A denso pump but it has a rather small 9mm plunger in it. As said before but not really enough detail about it.
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It fits on the 1kz perfectly but you have to remove the AHSC unit as the pump was designated to fit on the other side of the engine on the daihatsu 2.8td and it prevents you from fitting it to the 1kz. You have to switch and grind a bit off the throttle link as it pulls on the daihatsu and pushes on the toyota.
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I set the pump up to 1.57 plunger stroke and I've found that gets the sweet spot on the pump advance/retard
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Because I've only got a 9mm plunger and have read about hybrid pumps being setup. I've been fiddling with the 12mm e pump to extract the best bits to make the daihatsu pump more to spec with the 12mm 1kzt pump. The juicy parts are the high rise cam plate, the 4 rollers on the top left and the 12mm plunger sleave, plunger, springs washers and top plate.
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This is how it is set up inside the e pump. The round part on the center at the bottom is a pressure advance/retard that adjusts just that as you rev the engine the pressure adjusts the stationary plate/drum that the rollers are sat in.
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If your looking to manualise your 1kzte engine you want a VE4 then the higher the number the better but VE4 12 pumps arent on many engines. Then most importantly you need a RND pump which is designated for the front of the engine. If you see a LND then it is for the back of the engine run from the flywheel side, so it is designated to run in the other direction. It's been a while since I've looked into that but I believe that to be correct!
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This is the problem... you have the 12mm plunger in the middle and then the sleave. Between the sleave and the body there's a really hard to remove C clip! I have bent and broken pick kits, then you get 2 small screw drivers in there they bend and the clip just clips back into place! Last summer sitting in the sun on many occasions and no joy!
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Quite a fiddle to get the throttle linkages setup.. I think I used the modified setup from an auto hj60 which tonytoyota gave me, a link bar off an 80 and the cable off a bundera! Not exactly pretty but fully functional!
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So it's still running off a 9mm plunger pump. But it goes like stink and can do 95mph it's a bit under fueled when you have a really heavy trailer on the hills! Be real good to get that C clip out tho!