Thetbone 3 #1 Posted November 13 When starting the tractor, it takes 10 minutes of on and off cranking to start, choke does not seem to help...when I remove the air filter housing, it starts right up. I just had work done to the carb and new air filter, new gas filter. Any ideas on what is going on?? Share this post Link to post Share on other sites
lynnmor 7,317 #2 Posted November 13 Is the vacuum hose connected from the manifold to the power meter? With no vacuum leaks, carburetor done right and valves adjusted, an Onan will do a cold start with the choke closed and the throttle about one third. After it fires, the choke can be pushed off and perhaps need a quick blip on for a couple of times. My guess is that you had the carburetor worked on by someone that didn't use the Onan Service Manual. Share this post Link to post Share on other sites
Thetbone 3 #3 Posted November 13 I will check that...he most likely did not reference Onan service manual. Thanks Share this post Link to post Share on other sites
Ed Kennell 38,319 #4 Posted November 13 2 hours ago, Thetbone said: when I remove the air filter housing Is the air filter housing housing interfering with governor, choke, or throttle linkage? 1 Share this post Link to post Share on other sites
953 nut 55,388 #5 Posted November 14 4 hours ago, Thetbone said: takes 10 minutes of on and off cranking to start, choke does not seem to help I would start by replacing the fuel hose from the tank to the fuel pump, any slight crack will let air in and the fuel pump won't pump air. Share this post Link to post Share on other sites
Ed Kennell 38,319 #6 Posted November 14 I just put an electric fuel pump on my 520H to solve the slow start from the fuel losing prime problem that exists with most tractors with the tank below the fuel pump. If this one starts easily with the air cleaner off, there must be a different problem. 3 Share this post Link to post Share on other sites
k2wilson 41 #7 Posted November 17 (edited) On 11/13/2024 at 11:40 PM, Ed Kennell said: I just put an electric fuel pump on my 520H to solve the slow start from the fuel losing prime problem that exists with most tractors with the tank below the fuel pump. If this one starts easily with the air cleaner off, there must be a different problem. I am interested in doing the same thing. What are the specs/model of the electric pump you used? Edited November 17 by k2wilson Share this post Link to post Share on other sites
lynnmor 7,317 #8 Posted November 17 3 hours ago, k2wilson said: I am interested in doing the same thing. What are the specs/model of the electric pump you used? While using an electric fuel pump might be a good idea, it will do nothing to fix your problem. Share this post Link to post Share on other sites
