Kevippolito 3 #1 Posted September 18, 2022 so i have a 12 hp kohler engine, and the fuel pump is functional out of the engine because i can feel suction but when i put it in the engine nothing happens, i know the finger of the fuel pump is supposed to go somewhere but i’m not to sure we’re, can anyone explain we’re the finger goes, if you have pictures that would be great? Share this post Link to post Share on other sites
ineedanother 1,364 #2 Posted September 18, 2022 20 minutes ago, Kevippolito said: so i have a 12 hp kohler engine, and the fuel pump is functional out of the engine because i can feel suction but when i put it in the engine nothing happens, i know the finger of the fuel pump is supposed to go somewhere but i’m not to sure we’re, can anyone explain we’re the finger goes, if you have pictures that would be great? That arm rides on a cam lobe. This pic is not a Kohler cam and not one to drive a fuel pump but it might help. Worn lobes or a damaged or incorrect pump = no go juice. Replacing with an electric pump is an option. Lots of discussion on this site about that. 1 Share this post Link to post Share on other sites
peter lena 7,979 #3 Posted September 18, 2022 @Kevippolito https://www.amazon.com/CarBole-Universal-2-3-5P-S-I-Operating-Self-Priming/dp/B01IR6BNKY/ref=sr_1_3? have this carbole on my horse for years now , no problems , super quiet , hooked it up to starter switch , is self regulating , or you can also replace the original with same type , also have the opportunity to ad a vertical fuel check valve , 5/16 " , between pump and carb , evil energy https://www.amazon.com/EVIL-ENERGY-Return-Petrol-Aluminium/dp/B07ZB42CGT , pretty simple easy possible fix / upgrade . thats what I do to every problem , fix it , and also enhance it , only a suggestion . have lots of hours on my upgrade , works with out issues , pete Share this post Link to post Share on other sites
pacer 3,159 #4 Posted September 18, 2022 Hmmmm, thats odd. Dont recall ever seeing that particular problem. @ineedanother pic shows the lobes that open the valves, the fuel pump is much smaller - it only moves 1/8-3/16". Take something like a ....pencil/match stick/etc and stick it in the opening to where it touches the cam -- gently - hold pressure on the stick and turn the engine by hand and you 'should' feel the changing/lifting of the stick, if not???? get an electric, thats the best shot anyway. Share this post Link to post Share on other sites
pfrederi 17,027 #5 Posted September 18, 2022 Is it the correct pump. Small Block and big block Kohlers use different pumps. They look identical except for the shape of actuator arm... 1 Share this post Link to post Share on other sites
Handy Don 10,439 #6 Posted September 18, 2022 4 hours ago, pfrederi said: Is it the correct pump. Small Block and big block Kohlers use different pumps. They look identical except for the shape of actuator arm... Share this post Link to post Share on other sites
Bill D 1,577 #7 Posted September 18, 2022 Convert to an vacuum impulse pump. They work great. If you go this route use a genuine Briggs or Kawasaki pump. They are made in Japan and very good quality. Make a mounting plate and mount it as shown. 2 Share this post Link to post Share on other sites
Bill D 1,577 #8 Posted September 19, 2022 More mounting plate pics. Not my best fab work, but it gets the job done. I put one of these on my Dad's 312-8 and one on a 312-8 I sold to my neighbor. Both are still going strong. 1 Share this post Link to post Share on other sites