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I agree with ken. A rotary pump does not pulsate like a facet valve pump. (facet valve pumps are the small, cheap, square shaped ones) I've always run Dellorto carbs, which are kinda temperamental (I don't think I spelled that right) to changes in fuel pressure and volume. I've used facet valve, and rotary pumps with Dellorto DRLA's and DHLA's and the rotary pump didn't cause full throttle lean-out like a facet valve pump does.
Competition would require additional fuel volume, certanly more than could be supplied by any pump available at your local parts store, so therefore if you want no compromise in fuel delivery, get a high volume rotary pump and most importantly, get a GOOD regulator that can go down to 2.5 PSI.
The Bone
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