Thanks for the pointers. I got a good tip from a Cummins tech. He said to install a shut off gas valve in line just before it goes into the carb. When you're ready to store for a while, turn off the gas valve, start the gen, and let it run out to empty the bowl. He said you will never have to replace the carb if you do this.
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 shared. If this can help eaven one person to save time and $$$ it'll make me more happy, thanks for reading!!!
I've been searching all day for a video to show how to remove the carburetor. Thank you so much for taking the time to make this video, my dad will be very happy.
I appreciate the view inside the aircleaner. It is difficult to see the bolts when unit is installed and telling us that they are 10mm heads would have helped much if I had known that before I finally found out the hard way. Now, no one shows the problems re-installing in place. How do you get those thin gaskets in place without tearing them? Otherwise an excellent video.
These generators suck! Mine is a 2019 QG4000 and it's hard to start (always has) and has failed to start for the 2nd time last month so took the float bowl off just to find it missing the washer at the bottom. Did the RV dealer we bought it from lose it? I know I did not. Wanted 350.00 in parts for a carb + labor when a .50 cent washer was the biggest problem. Of course you can not buy the washer from Onan/Cummins. Seems a scam to me. How many RVs are driving in the US with these garbage generators???
Mine is missing this brass/ copper washer as well seems to run very rich and only for about a minute and shutdown. I just acquired this rig and gen has 0 hours on it . I’m assuming this has been a problem from new and no one has delt with it. Thanks for your comment, this is how I discovered this. Thanks
@@southernillinoisrazorrider3459 I made my own replacement crush washer from a larger aluminum one I had by drilling out the center hole and rounding off the outside on a bench sander. Also installed an inline manual fuel shut off valve to keep gas from getting into the bowl during storage so now I store the RV with the bowl drained and inline valve closed so no way for gas to just sit in there and get nasty... I really feel this is a scam! You carry this huge heavy generator around everywhere you go and the one or two times you need it the thing won't start without an overhaul. I will add after replacing the washer it needed to have the fuel/air mixture re-set as it was never correct and to do that the little black plastic 1/4 turn restrictor/cap had to be popped off to allow more than a 1/4 turn. It runs great now with no surging and starting is much improved after cleaning/replacing the fouled/flooded plug. These things are a scam IMO and Cumins should be held accountable. If this helped for one person it was worth the effort to keep these crooks form selling and installing a new carb at ridiculous cost......
Everyone seems to enjoy wasting time and money replacing carbs, fuel pumps, fuel filters and circuit boards instead of doing a little basic mechanics and doing the free checks first. I am confident there was little to nothing wrong with the carb.
Like I said I’m not a professional videographer the install went fine and it ran great. I just sold it three months ago so the RV is gone but not forgotten thanks for the watch
Anyone that watches this should be aware that those knock off carburetors on Amazon are more cheaply built internally, they have a hard tip needle and seat assembly where the genuine Onan has a soft tip, etc.
Ike Stewart Well if the knock off company can manufacture the whole thing for 10% of what Onan charges I’m sure Onan can lower their prices because I can buy six more at the same price each time they fail their own and it’s just way overpriced anyway you slice it
No joke, I need to make a video and show everyone how to fix this very simple carburetor when this doesn't work. The hardest part is getting the carb out....and that's not that hard. Did mine this afternoon today. 12-13-20 Save yourself 4-5 hundred bucks by replying to me. Hint.....the problem is where you can see the choke butterfly valve.
@@str8baller928 I've learned to run my generator (with stabilized, relatively fresh gas) about once every 1-2 months for 5-10 minutes. In California, stored gas lasts about 5-6 months before it starts to go bad. But if my carb ever gets clogged again, I'll make a video.
