eric8 7 #1 Posted 13 hours ago (edited) My 93 520h originally had a Nikki -0479 carb. I bit the bullet and ordered a brand new one directly from Cummins (-0496 model) which is the newest part number and direct replacement for the 0479. There is a round port on the new carb that isn’t cast into the old one. I believe this is the accelerator pump casting, but I was under the impression the 0496 is a non accelerator pump carb. Is there some type of block off plate that needs to go there? Edited 13 hours ago by eric8 Share this post Link to post Share on other sites
eric8 7 #2 Posted 5 hours ago (edited) Upon closer inspection all 3 holes in the accelerator pump cavity are blocked off/blind holes. The bottom right hole looks open, but it’s blocked. Perhaps Nikki has gone to one universal casting. I’m assuming the non emissions carb part #’s have the holes plugged and the emissions spec part #’s get them drilled. This was ordered directly from Cummins. Edited 5 hours ago by eric8 Share this post Link to post Share on other sites
