Re: Generator Refuses to Start Reply #25 – May 05, 2023, 02:17:40 pm Hi Don. Another video from Ritchie showed how to replace the in-line fuel filter. What an awkward place to put that filter! Seems to me that it might be partially plugged in your application. If it were unable to supply as much gas as the generator wanted, it might run for quite a while, until the load switched on, and increased how much fuel per minute the generator needed to stay on. RonB
Re: Generator Refuses to Start Reply #26 – May 05, 2023, 04:28:45 pm Thanks Ron, I am trying to build up the mental fortitude to replace the fuel pump and filter. I have done it before and it was no picnic. Getting the control board back in is a real PIA. I will procrastinate until I finally break down and order the parts, over $200. And there is no guarantee it will solve the problem. It will now run for 2-3 minutes until it fails. I will try to rig a sketchy fuel container hung from over the generator with Sea-foam in it to ensure there is no crud in the carb. I don't see how there would be. BTW, I have not put a load on it yet.
Re: Generator Refuses to Start Reply #27 – May 05, 2023, 09:31:39 pm Quote from: Don Malpas - May 05, 2023, 04:28:45 pmIt will now run for 2-3 minutes until it fails. I will try to rig a sketchy fuel container hung from over the generator with Sea-foam in it to ensure there is no crud in the carb. I don't see how there would be. I was going to suggest this. Assuming you will unplug power to fuel pump? Also, have you tried to pump a cup or so out of the fule line to see if any debris in the catching container?
Re: Generator Refuses to Start Reply #28 – May 06, 2023, 09:36:24 am Quote from: mrfixit454 - May 05, 2023, 09:31:39 pmI was going to suggest this. Assuming you will unplug power to fuel pump? Also, have you tried to pump a cup or so out of the fule line to see if any debris in the catching container? Yes, I will plug the fuel line from the fuel pump. And yes I have pumped out a 1/2 pint from the tank.The carb bowl is clean. Whatever is above the float I don't know about.
Re: Generator Refuses to Start Reply #29 – May 06, 2023, 10:51:39 am I missed 1 monthly maintenance run and my gen wouldn’t run. This time I bought one of the cheap Chinese knockoffs, which did resolve the problem. Now I close the fuel shutoff valve and run it to fuel exhaustion before inactivity longer than a week. I can buy many of the cheap carbs before equalling the cost of another authentic carb.
Re: Generator Refuses to Start Reply #30 – May 24, 2023, 05:37:42 pm I hate to let this thing beat me.Today's test eliminated the fuel in the gas tank as the culprit.I connected a fuel line BEFORE the fuel pump/filter to a container of clean gas. It starts and runs for 3-4 minutes surging all the time. By that I mean the butterfly valve on top of the carb goes back and forth like it possessed. Then it settles down and runs kinda smooth for a few more seconds until it dies.The code is 3-3, which is not a code in the micro quiet owners manual.So I have cleaned the carb bowl and solenoid.The remaining possibilities are:Fuel pump/filterSomething with the carb.I am going to have to bite the bullet and replace fuel pump/filter.Edit: I am betting I did not buy a genuine Onan fuel pump for $150 when I replace it about 3 years back. Probably bought brand X for $30 not knowing there is supposed to be difference in pressure.Would you please look at your carb and see if there is screw where the arrow is pointing to.Question: Do you know the function of the screw just above the arrow pointer?
Re: Generator Refuses to Start Reply #32 – May 24, 2023, 06:14:49 pm In my carb photo it looks like the carb is not connected on the right. This is an optical illusion - there is a glossy black 1/2” spacer between the carb and the engine block that looks like it’s not there! But it is.
Re: Generator Refuses to Start Reply #33 – May 24, 2023, 07:16:05 pm Thanks, they look the same. What I thought could be a missing adjustment screw is just part of the casting Now what could the adjustment screw adjust?
Re: Generator Refuses to Start Reply #34 – May 24, 2023, 07:57:12 pm Don,Was thinking about this the other day. That screw might be an idle screw which you should not really have to mess with.Have you measured how much files comes out if you pump it into a container? I really think you have a clogged Carb. maybe after needle and seat or up the main jet chamber . You would need to take the carb off and spray all ports with carb cleaner and air. I can't find the 4ky carb cleaning video, where you take it apart. I am finding Marquis gold one but those have larger carbs but the process of cleaning might be the same. Or maybe even get a new carb. I feel you have just a code 3 problem (maybe even code 33, a link below explains more) ) .... this is for 5500 but probably the same,,, the fuel part.How to Fix Fault Code 3 on Onan 5500 Generator? (Error Solved!)And an option though yours might be more clogged than this... (soaking even more than 1 time might be key)https://www.youtube.com/watch?v=wX6Pbh7HEMUMore details about codes and more care... If all cleaning does not work, carb needs to be replaced and with a good one.https://www.justanswer.com/small-engine/esnzt-onan-4000-wouldn-t-start-cleaned-carb-start-die.htmlRamonAnd online service manual.https://manuals.heartlandowners.org/manuals/Electrical/Generator/Onan%204000/ONAN-Microlite%204000%20Service%20Manual%20Spec%20K.pdf
Re: Generator Refuses to Start Reply #35 – May 24, 2023, 08:04:39 pm Don, I'd bet on the screw your referring to is a throttle stop screw. Is it screwed in tight or does it have adjustment? At any rate, I wouldn't monkey with it unless I could get it back to the correct position.Jon
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