"Manic-Mechanic" 1,249 #1 Posted September 14, 2020 (edited) I bought this generic fuel pump quick from Amazon. It ran great but leaked through the housing profusely! The original pump had developed a bad diaphragm and more than likely leaked fuel into the block, not wanting to have any issues I drained the oil. You can see the wicked dark thinned oil and smell the stench of fuel! I found a couple rebuild kits that worked thus far for the original fuel pumps. NAVARME 230675 Fuel Pump Rebuild Kit for Kohler Onan Tractor Generator with Spring Gasket 230675. Edited September 14, 2020 by oldman tried to seperate pictures-failed 1 Share this post Link to post Share on other sites
WHX?? 51,272 #2 Posted September 14, 2020 Those plastic pumps get mixed reviews so be careful. The diaphragms from fleabay ain't no better. They are cheap but that's what you get and do not contain the valve plate gasket or valves if needed. The original diaphragms have three stacked on them to keep the fuel out of the case these don't. Best off rebuilding the OEM pumps from here. https://www.then-now-auto.com/kohler-fuel-pumps-2/ 3 1 Share this post Link to post Share on other sites
briankd 819 #3 Posted September 15, 2020 (edited) 6 hours ago, oldman said: I bought this generic fuel pump quick from Amazon. It ran great but leaked through the housing profusely! The original pump had developed a bad diaphragm and more than likely leaked fuel into the block, not wanting to have any issues I drained the oil. You can see the wicked dark thinned oil and smell the stench of fuel! I found a couple rebuild kits that worked thus far for the original fuel pumps. NAVARME 230675 Fuel Pump Rebuild Kit for Kohler Onan Tractor Generator with Spring Gasket 230675. i have bought 2 kits from then and now auto one was a pulse diafram and worked the other was for my k 301 like is pictured here with the T rod on the diaphram and couldn't get it to pump had it apart 3 times and called then and now and they told me to try something and stillwon't work ended up putting the original back in and works for now guess will buy an electric pump if mine ever starts to go bad good luck Edited September 15, 2020 by briankd spelling Share this post Link to post Share on other sites
"Manic-Mechanic" 1,249 #4 Posted September 15, 2020 (edited) I know the rebuild kits are not the best quality and the valves in the pump also must be clean and moving freely. I had one I rebuilt and it didn't have any suction at all, I put it on and the gas makes it to the carb. I know the carburetors are sometimes missing the little clip that holds the needle to the float and that can cause issues. I just rebuilt the carb on the m12 and it wouldn't start this afternoon. I sprayed cleaner through the intake and it fired up. There is a kit out to replace the needle, it's around 25 bucks or so. I do have a very old fuel pump that I rebuilt it really pumps! I am getting burned out tho'/ Oldman WH89-90 #T45 Kohler Engines Hard Starting.pdf Edited September 15, 2020 by oldman correct pdf Share this post Link to post Share on other sites
