Bill D 1,926 #1 Posted May 19, 2021 I saw a thread on here about Kohler fuel pumps that were operated by crankcase vacuum instead being operated by a lobe on the camshaft. Anyone know why Kohler changed to the camshaft operated pumps? The vacuum pulse pump could be used on any engine without the need for different lever designs. Just curious. Bill Share this post Link to post Share on other sites
ebinmaine 67,618 #2 Posted May 19, 2021 I know the small blocks used a vacuum pulse pump in the early years until at least 67. Trina's 867 has one. Not sure about the big blocks of that era. @OldWorkHorse Steve have you removed the fuel pump from the 12 horse engine on the 1257? Maybe the switchover was done for strength and reliability reasons? Did Kohler ever go back to vacuum pulse pumps in the recent years? 1 Share this post Link to post Share on other sites
Achto 27,604 #3 Posted May 19, 2021 7 hours ago, ebinmaine said: Did Kohler ever go back to vacuum pulse pumps in the recent years I believe that the KT twins had a pulse pump. I also believe that the newer engines are all pulse pumps. 2 Share this post Link to post Share on other sites
pfrederi 17,741 #4 Posted May 19, 2021 KT 17s on C175s used arms as did magnum 18 on 418A 2 1 Share this post Link to post Share on other sites
The Tuul Crib 7,336 #5 Posted May 19, 2021 1 hour ago, Achto said: I believe that the KT twins had a pulse pump. I also believe that the newer engines are all pulse pumps. All the kohlers , kawasakis had the pulse pumps at least 20 years back maybe more. 1 Share this post Link to post Share on other sites
Maxwell-8 4,277 #6 Posted May 19, 2021 (edited) Probably more reliable (more powerfull) as it's also used on a lot of older cars. As fueltanks are further/lower from the carb in those applications. But also in like a 300-series WH. Edited May 19, 2021 by Maxwell-8 Share this post Link to post Share on other sites
