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Onan 4000 microquiet generator Carb fix
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- Опубликовано: 14 авг 2024
- Carburetor fix for Onan 4000 microquiet generator.
Float bowl cover swap
This is the carburetor I purchased from Amazon: www.amazon.com...
Great video! I took off the solenoid, disassembled it and ran the brass nozzle and bowl thru an ultrasonic cleaner. Sprayed out the inside of solenoid with carb cleaner. Removed the altitude adjustment needle and put it in the sonic cleaner too. ( count the number of turns and note orientation of that plastic stop for reassembly). Connected the solenoid up to a battery to insure it worked. It did. Put all back together. It started and ran great. Mine was flooding out and leaking gas out of air cleaner housing too. Gave the “36” code also.
Thanks for the help!
Thank you for info. This video and your comment saved my butt. Bondocking in Southern Az. Need my generator badly on cloudy days.🎉🎉😂🎉😢🎉
I used your method yesterday since I was promised a mechanic, but he never showed after 2 weeks. I reviewed your method after I purchased my new carburetor from Amazon, cheap. I looked at your video a few times and then just went out and done it. My generator works fine now Thanks!
Great info. This led me to finding the altitude adjustment needle valve being clogged up. I sprayed it out with carb cleaner from both sides of the needle valve along with the other gunk at the bottom of the bowl. My onan had very few hours on it and only got ran once a year, so this was a result if letting it sit.
Used the sea foam really to no avail, it did work a little but still had the surging. Try this! unscrew the drain plug (screw with a spring) get a can of carburetor cleaner with a spray nozzle and work the spray nozzle in as far as you can. If you jimmy the red spray nozzle while your pushing it into the drain plug hole it will slide into the bowl just enough to when you spray, 90% of the pressurized spray will go into the bowl. spray for like 15 to 20 seconds. Have the screw in ready position so that when you pull out the spray nozzle put the screw in as fast as you can so you don't lose a whole lot of carburetor cleaner. If you get enough to stay in the bowl, let it set in their for about 30 minutes then start the generator. I did this while still hooked up to a gas can with sea foam. Worked for me!
Thank you for this video! I watched a ton of other videos and changed out the oil, spark plug, air filter, fuel filter, fuel pump, and cleaned the carburetor all to no help. Was about to change out the carb to the cheap Amazon carb when I saw this video and bam! Running like a charm!!
It's a miracle! After many days/hours of messing with this carb issue, it is fixed and runs like new. Basically followed your instructions by substituting the new carb bowl from a new $25 carb off amazon but reused my original metering jet with attached solenoid. I also followed Jason Klein's recommendation and removed the two bolts in the air box which allowed the carb to be rotated in place (linkage attached), giving easy access to the bowl. Fired up immediately after priming. Had previously used the SeaFoam method twice, but it took a good dozen tries to get it started and it ran very poorly (surging) and would not start again after a few days. This was a simple and inexpensive solution for gummed up carbs. From now on, I am draining the bowl after use (using the screw just below the metering jet). PS my generator is the RV QG 4000.
Way to go 👍,if this happens again just remove the Altitude Adjuster,clean up the needle and the orifice,99% of the time fixes the surging problem.
THIS IS HOW I FIXED MINE, IN THE CASE OF....
"I CAN'T START MY GENERATOR"
It's has been two years since last time it was running, so I started by checking oil level full at gen dipstick (it won't start if low oil because of sensors) then I checked gasoline more than 1\4 tank in the RV (also safety sensors), sparkplug checked for good spark, also checked the manual reset circuit braker ( to be ON) at front motorhome engine compartment for 12v current to the generator to be able to start it, also cleaned the carburetor and even installed new one but same situation, then checked wires and found some has been chewed like gum by rats at the back of starting switch generator panel so I replaced them, at this time the generator started but stay running only by keep pushing the switch on all the time, so then finally I knew it was internal electrical problem from the engine itself, so I took the generator out from my RV to work in my garage, (I did this by myself with some tools and old Mayan tricks ) lol, it's really heavy for one person.
I disassemble the unit at my garage and started by removing the cover, then the cooling fan or flywheel unit (it's 2 items in one) until finally I was at the gen rotor and brushes assembly area and this is what I found: one more wire chewed by filthy rats plus the stinky rat nest in the middle of the generator motor coil, I fixed the wire and sanded the commutator copper contacts where the brushes are sitting becouse they were real duty with old urine from the rats, and of course I got rid off the stinky nest, lol!!!
Then I assembled everything back together and... bingo it's runing like a champion!!!
For this project materials involved was about $60.00 including an aftermarket new carburetor and an harmonic balancer/steering wheel puller (available at any auto parts for $25.00) to pull the aluminum fan out and (flywheel).
Just picture this: (Any gasoline engine run smooth if gasoline and DC current aren't interrupted) so following this important principle you'll always find the problem to be fixed.
Also if you have a onan microlite 4000 like mine, don't run it for more than a minute without the cover because you'll cook the engine real fast, also keep the eye on the aluminium fan and your fingers after cranking it in case you missing one or two members...just kidding, lol!!!
After testing the gen then I did put the air cooling assembly back and the rest of components including the cover, now it's ready to be installed at my RV.
Once the gen was installed back at my motorhome I started it to be tested for electric power but not before flipping the electric switch (on) at the gen starting control panel (sometimes hiding under or around the panel) to transfer power to my RV GFCI main outlet and electric panel as well, my motorhome it's equipped with GFCI so I reset it and tested for green led light indicating power is ready at my main breakers panel, so I turned my main breaker (on) along the others ones but no power was present at my breaker main switch (faulty main braker) so I flipped it many times, sometimes you can make it work again, mine did work, lol!!!
I'm happy because everything works now including the ref for cold drinks and AC for this crazy summer, lol! Later I'll buy me a new main braker, for now this is a resurrected generator story that needed to be sheared.
If this can help eaven one person to save time and $$$ it'll make me more happy, thanks for reading!!!
I just fixed my generator today using this technique! I bought a $42 carb off Amazon and swapped the bowl and the Brass Jet assembly. Mine looked the same as the original too. Thank you for this guidance! Awesome! I got the carb delivered from Amazon in one day. Swapped it today and it runs awesome. Saved me a tom of money and time!!!!!
Glad to hear…..I’m up for saving some money. Especially when it’s a TON. 😝😉
This method works and saved me a ton of time! Here was my slight modification in the process: I removed the fuel lines and 2 bolts holding the carb in place, then I rotated the carb to make the float bowl and wires easier to access (all linkages still connected), then swapped out the original float bowl and plunger with one from a carb I bought for $50 on Amazon. Total process took about 30 mins and the generator fire right back up without any hiccups. I cannot thank you enough for this trick!!
Hey Jason, I’m glad I could help you out and save you some time. I worked on my generator for over a month before I figured this out. And I wasn’t going to buy a Factory Replacement Carb for $500.00.
Thanks so much God blessed you for your contribution, after many hours I fix generator with your advice thank so much.
Thank you for all your tips, I will be doing this when mine arrives:)
My generator was doing the same thing after after I replaced the carburetor. I have been literally working on it for the last year trying to figure this out. Thank you! Thank you! I literally rebuilt the whole generator trying to solve this problem.😀
I wonder if simply removing the restriction of the plastic "knob" from the altitude adjustment screw and setting it to what would be a negative altitude would work without doing anything else. The zero altitude setting lets more fuel flow than the higher altitude settings. When varnish forms in there it restricts the flow so zero altitude setting works more like the 5000 ft setting. It would seem just opening the jet a bit more would let enough fuel to flow that the thing would run. To avoid the problem, put an inline fuel valve a few inches from the carb. Stop the generator by shutting off the new valve so it runs dry. No fuel in the bowl to turn to muck. No oxygen gets past the valve to form varnish. Of course running the generator for an hour every month at half load as called out in the manual actually works perfectly.
You are absolutely correct,My Onan 4000 is 4 yrs old and started to surge,I noticed if I turned the Altitude adjustment counter clockwise to zero it would smooth out,so I removed the Altitude adjustment and cleaned the needle and orifice,reinstalled it and set it back to the factory setting fixed the surging problem,👍.Also the screw just below the Altitude Adjuster is for draining the fuel out of the carb,I suggest if you are not going to use or run the Gen for some time open this screw and drain the fuel in the carb,this will prevent the fuel from evaporating in the carb and leaving the varnish that clogs the carb.
Thanks Todd. I have a Microquiet 4000 that was surging. I used this info to simply remove the solenoid and pull the bowl off. Then I cleaned the bowl & solenoid wirh carb cleaner and reinstalled. Generator runs perfect now...Thanks again.
No problem…just remember to start them every other week or they start to gum up again.
I just wanted to see where the washer went above the plunger! Thanks for that
Thank You. I just spend all day trying the amazon carburetor. It never start untill I unplugged the electrical cable. Thats why i found you. I will do exactly what you just teach and hope it will work.
This video just saved me a ton of time. I did this and after a lot of priming she fired right up.
Nice to hear. I love it when someone gives you some free information and it solves your problem.
Thanks it actually worked,the generator runs good and It only cost 70.00! Thanks again
No problem. It took me a little more than $70.00 and three weeks to figure this fix out. 👍🏻
$35 amazon carburator, 30 minutes, she fires up like a champ! We did what he said except we used the new big brass jet also, because it matched the old jet. We didn't extend the wire either.
I've found mine yeahhh
I just had to drop mine off the frame for the second time and dissemble all the way down to slip rings, could you tell me how the hot (black wire) comes up from the liquid tite conduit and over to the breaker? Does it go under the bristles or through a hole. Thanks
Well I’ll be damned ! I put the new carb on and flooded out also! Just thru it in the corner and put the old one back on ! Still same problem can’t find a fix . It runs after a bit it dies. Going to dig out the new one and try your trick thanks 🙏
Works as advertised.
On the silver piece, did you use the new or old "rod" "Jet" or whatever that piece is that moves up and down. I currently have the new bowl how you suggested, bottom silver piece is new, I put the old "rod" or "Jet" in and then put the old brass piece on top. I noticed the new "rod" or "Jet" was longer than the original. The old "rod" or "jet" moves up and down freely in the new silver piece. I also cleaned the old rod with Seafoam. Recap- Silver piece new, rod inside new, bench tested and it moves freely. Bowl is new, Float is old, Upper carb is old. I am firing it up tomorrow and see how it goes. I removed the carb and did the work on a bench inside because of the weather. Also, how do the top pieces fit for the throttle?I want to make sure I have these hooked in right. I took pictures, but I just want to make sure it matches and moves correct. When I tried the Amazon new carb on its own...it flooded....made my Onan 4000 have white smoke, and I think dumped fuel into the oil. I am going to drain the oil, change the plug, and fire it up. I will update here how it works. I hope your video is my answer.
Thanks for the tips
any tips on how to install the carb. giving me a hard time of it.?.
Sorry to say, this didn't work for me. Left my generator un-run for 6 months. Seems it got clogged up. Tried the Seafoam and gas can with Seafoam and gas. Would start when primed with Seafoam but would not stay running without spraying in the seafoam thru air intake. Got the cheap Amazon carb and swapped out the bowl and solenoid and brass jets as they looked identical to Onan jets. Started up when primed with seafoam again just like before. Same results. Runs when spraying in the seafoam but dies after no more spraying. Will not run. I had replaced the fuel filter earlier with Onan filter and unhooked fuel line at carb and turned over and fuel was spraying out so it's getting the fuel to the carb, just not staying running. Wondering if I should just replace the complete Onan carb with the cheap Amazon one, but have read so many horror stories about gas spraying out and problems with the amazon carb. Any suggestions are appreciated.
Thank you!!!!!
No problem. Glad I could help you out. 👍🏻
I think this is going to work for me. I have tried and tried to figure out what's wrong with it. I bought an RV that has been sitting for a while and the generator won't stay on if I don't keep the on switch pushed in. Will let you know if it worked
Yes it worked. Thank you so much. It only took me about an hour and the hardest part was trying to figure out how to unbolt the copper jet thing out of the bulb cus my wrench wouldn't fit and didn't have much room in there. But I thought my ac would work with the generator but it doesn't unless it's plugged in to electrical outlet so I'm not sure what the generators purpose is for then. But thanks again.
I bought the replacement carb off of Amazon.
Sounds like the solenoid was the problem, not the bowl.
More holes means less chance of clog?
Thanks for the info….I didn’t know if it would flood it out or not. So, I used my OEM one.
Hi and thank you for your video I am wondering if I should order a carburetor off of Amazon for some reason mine is running super rich and I have clean the carburetor and it’s still running rich I’m wondering if that solenoid deal that is on the bottom side of the carburetor that has the two wires going into it is faulty.In your video you refer to what I’m talking about to a solenoid
Hi, if you order a carb off of Amazon….I would only use the Carb for Parts for your Original Carb. The carb I bought off of Amazon flooded out and wouldn’t run after 30 seconds. That’s when I took a long look at the Float Bowl Cover and noticed the small hole in the bottom of it where the solenoid screws into it. I replaced the old float bowl cover with the new one and Presto…it worked.
So essentially you replaced the bowl and the solenoid and that fixed the no-start problem ?
Yes…it worked for mine. Others have committed on what they did too.
The apparatus you called a jet is actually the automatic fuel shut off
Do you recall the wire number and where it hooked to on the extension you put in? I am trying to put one back together and don't know where it lands. Thanks
Hey Ren, I don’t have a wire number, I think it might be a 14ga wire. What I did was just cut the solenoid wire from the motorhome (leave an inch from the connector to splice new wire in), and connector the new wire (with crimp connectors) to the old wire & the old connector.
Thanks.
Hey thank you very much for getting back to me. Good advice and great video btw.
I would like to know how you got the part of the generator? It is about a 17mm, but you can't get a wrench or socket onto it. So curious as how you removed the old one from the unit.
Hey Kirk, what part are you talking about? Can you provide a picture?
@@toddc6912 You removed to old solenoid and brass looking nut from the carbuertor installed and changed it out with an aftermarket bowl and used the 2 hole jet. I can't get anything between the altitude adjustment and the parts to remove. Just wondering how and what tool you used to take the old one off.
Hey Kirk, I think I used an adjustable crescent wrench.
is there any reason not to just replace the whole carb? seems as if it probable the not much more time?
I didn’t replace the whole carb because of Cost. I couldn’t afford to pay $500.00 for an OEM Carb. I bought this replacement carb off of Amazon, but it wouldn’t stay running with it in.
What’s the part # for the carb?
where u buy the $60 part???
Awesome video. I guess I'm just missing the point of swapping the bowl cover. Can't it just be cleaned? Or is that something you tried and it didn't work?
Hey Carlos, I tried to clean the bowl out before buying the new Carb. Their is a small Pilot hole in the bowl that gets gummed up and clogged.
@@toddc6912 I see. Yeah I just finished cleaning it. Going to pop it back on and see if that was my problem.
@@toddc6912 hey so now it actually starts! Now it runs and surges for about 2-3 minutes and then dies.
@@carloslugo6684 have you tried mixing “Seafoam” carb cleaner with gas and run it? I mixed mine @ one can to one gallon of gas. It helped some.
@@toddc6912 before all this, I drained the gas tank and put in 5 gallons of fresh gas. I put one can in so far. I'm going to disconnect the fuel line going to the carb and dump it out and fill the line with seafoam. That way when I prime it, it'll be a strong mixture.
ebay or amazon 400 onon carbs work great just get 2 new ones and keeps other one for spare parts the factory one are 500 what a joke
🤣🤣🤣 you said simple.........