Tgalo 121 #1 Posted August 2 If using an electric fuel pump, should you eliminate the mechanical vacuum pump? Thanks, T Share this post Link to post Share on other sites
peter lena 9,309 #2 Posted August 2 @Tgalo, thats what I did on my set ups , replaced the pump with a blank bolt on , eliminating the chance of pump lever arm break off dropping into oil pan / crank areas . years in use , no issues , pete Share this post Link to post Share on other sites
rick 257 #3 Posted August 2 When I put an electric fuel pump on my 416H and 314-8, I bypassed the OEM pump. You don't want to keep the OEM pump in the line, if a diaphragm should crack the crankcase will fill with fuel. On the 314-H I replaced the OEM pump with a Kohler blocking plate because the original pump base had warped. Share this post Link to post Share on other sites
rick 257 #4 Posted August 2 Keep in mind that an electric fuel pump is more efficient at pushing fuel than pulling fuel. I mount the electric pumps as close and as low as possible. Be sure you have a fuel filter between the fuel tank and the fuel pump. I add another fuel filter closer to the carburetor. 2 Share this post Link to post Share on other sites
Tgalo 121 #5 Posted August 2 I read a few other threads on this too. I don't ever plan on using a rock shaft so was going to mount it under the seat right next to the tank out valve. It's an Onan with the original vacuum pump mounted on the fan shroud. What do you do with that style pump? Tired of 3 minutes of cranking after it sits for a week. T Share this post Link to post Share on other sites
rick 257 #6 Posted August 2 I just left mine on the shroud, but by passed it. When I pull the shroud (and a lot of other parts) to adjust the valves I will block the vacuum port and the hole in the shroud the hose passed through. I have a rock shaft on the 416-H, I bent a steel strap and mounted the pump on the left inside of the fuel tank mount. It is just low enough to clear the fender pan. Share this post Link to post Share on other sites
