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Old 02-23-2020, 11:07 AM   #21
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The emulsion tube is a small tube with tiny holes in the side, it mixes air with the fuel creating better atomization. They are usually brass and sometimes plastic. It is located above the main jet and can usually be partially seen inside the carburetor bore. When a few of the tiny holes get clogged full throttle power is reduced and the engine likes more choke to help force fuel in. They can frequently be the cause of surging on governed engines.(like a generator)

Many carburetors have been unnecessarily replaced because the tube was partially clogged.

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Old 02-23-2020, 11:21 AM   #22
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It can be a lot of things. If you have time, take it apart, clean everything, put it back together. Since he is (was) on a tight schedule, it's cheap and quick to replace carb and do a tune up. Then you have an extra carb you can repair later.
It's looking like we might not hear the final outcome of this story.
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Old 02-23-2020, 04:42 PM   #23
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A new carburetor is around $300.00. The ones you see on Amazon and ebay are Chinese copy attempts.
Since he would have to R&R either way cleaning would be faster than shipping.
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Old 02-23-2020, 05:36 PM   #24
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A new carburetor is around $300.00. The ones you see on Amazon and ebay are Chinese copy attempts.
Since he would have to R&R either way cleaning would be faster than shipping.
Several years ago, my neighbor who is not mechanically inclined had a problem with his Toro mower. The carb was spitting gas all over the place. He priced a new carb (Kohler), and they wanted $89 for it, plus another $10 for the gasket. He went on ebay and found one for $10 from China. He said he would take a chance on $10 and ordered it. A week and half and it was delivered. It came with a gasket. All we had to do is take the choke linkage off the old carb and put it on the new carb. Installed the carb, pulled twice on the cord and the mower fired right up. It's been running fine for over three years now. Go figure!
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Old 02-27-2020, 07:47 PM   #25
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I always run ethanol free gas in my boat, generators, and any small engine.
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Old 02-27-2020, 09:22 PM   #26
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Parked or boondocking Avi and Laughlin Casino's. I see that a lot of class a and class c Motorhomes are not using their built in Generators but Plugged into Inverter Portable ones. Lots of 3400 Champion Inverter Gens with wireless start. I also see Honda's but inverters. Maybe you should invest in one instead of using that Onan 4000. I asked why to one Guy next to me he said they are a lot quieter than that built in one. Just an idea. Does it have a transfer pump or fuel pump maybe that's failed.
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Old 02-27-2020, 10:05 PM   #27
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I always run ethanol free gas in my boat, generators, and any small engine.
Around here the ethanol free sells for over $1 per gallon more than E-10.

I don't bother and have NEVER run ethanol free in any of my small engines. Funny thing, they all run fine, even the lawnmower that sits all winter with E-10 in the tank.
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Old 02-27-2020, 10:30 PM   #28
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This is great stuff: https://www.amazon.com/dp/B000CCMNAG/ref=dp_cerb_1 to add to fuel.............

and https://www.amazon.com/dp/B0002KKIE6/ref=dp_cerb_3 this to spray into running, rough idle carb to clean and smooth it out.

Get at your local auto parts store like OReiley's, farm and home stores or WalMart.
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Old 02-27-2020, 10:33 PM   #29
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Generator last minute fubar....

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Originally Posted by rsdata View Post
perhaps the adjective NEW should not have been used, as yes, these 10% ethanol blends are used all over the country for many years...

But I do disagree that Stabil does work for keeping carbs and gas from gumming up during over-winter storage. I have added fuel shut-off valves to the fuel lines, but usually try to run the gas tank dry before end of the year storage, which eliminates most of the carb gumming problem.

However I believe the ONAN genny runs off the MH fuel tank, and other safeguards such as adding enough Stabil for the entire tank might be prohibitive.

Certainly would l like to hear back from the OP...
I also want to hear back from the OP. I use Sea Foam in all of my small engines and have never had a problem. If the engine has a fuel shut off, I shut it off and let it run until it stops. I top off all fuel tanks before storage.
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Old 02-28-2020, 09:43 AM   #30
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I learned never use paper towel on a carb, lint and fibers are your enemy. We learned to rebuild them on a cookie sheet and have a low pressure air nozzle with a pointed tip to blow out the orifices along with some small copper wire. Go back and do all of your pm's and pull the float bowl again and spray out with some carb cleaner (no paper towel) just some light air and let it dry. Pay attention to the low idle jet. Top off the gas with fresh gas. I have mixed reviews on cheap carbs and the money invested in an oem rebuild is well worth it.
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Old 02-28-2020, 10:09 AM   #31
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Tilly22

If you sprayed starting fluid into the air intake without any engine response, the problem is no spark. Check your spark plug, and engine coil.
A common problem is the oil level sensor. If your engine has one disconnect, and try again.

If these three things are OK and it still will not start you need a mechanic.

I have repaired small engines for 58 years. Hope this message helps.
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Old 02-28-2020, 10:37 AM   #32
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First, welcome to the forum!

Since the op is short on time now would be the time to find a small engine shop to fix the problem.

It sounds like he's flooding the engine, possibly damaged the float or main jet. He has gone from a running geny hunting to one that doesn't run any more. You seem to have some knowledge of engines but this has now gone fubar. Just for info, gas engines as a whole need 18 to 1 air/fuel mix to run, anything either side of this will make it run poorly or not at all, running above 18/1 is lean running and will burn out your engine.

On stabilizer, we have 26 or 27 small engines at the resort, genys, fire pumps, mowers, boat engines, etc; we don't drain we just put a double dose of stabilizer in the tank and run 5 minutes. No issues in 17 years I've been here.

To the op, go easy on the quick start, it will wash away any oil film in your cylinder and can damage the engine if too much used including blowing the head gasket or worse.


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Old 02-28-2020, 11:24 AM   #33
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My two-cents.

Unless you are a certified mechanic or a simple external cleaning doesn't work....

Find your regions Cummins Power service center and bring it in.

Not saying you did any permanent damage or that this is a serious issue but a new generator will cost you thousands.
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Old 02-28-2020, 03:26 PM   #34
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If it helps, the issue I have with my gen. is the fuel pump at the engine. It appears to rust internally and plug when in storage. I use Seafoam in all of my toys to stop ethanol-shellac buildup in the carb. Now, every season I replace the fuel filter, blow/suck out the fuel pump and run the fuel fill station pump every month to lube that pump.
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Old 03-03-2020, 10:04 PM   #35
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Just so you all will know, George W. Bush advocated for alcohol as a partial replacement for fossil fuel (gasoline) during his presidency and signed a bill into law requiring its usage nationwide. I believe it was in 2007. That was 13 years ago. I suspect Onan and other small engine manufacturers have been able to design engines that will run successfully on 10% alcohol since then.
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Old 03-03-2020, 10:35 PM   #36
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Quote:
Just so you all will know, George W. Bush advocated for alcohol as a partial replacement for fossil fuel (gasoline) during his presidency and signed a bill into law requiring its usage nationwide. I believe it was in 2007.
I think if you do a little more research you will find that E-10 gas and tax subsidies were well entrenched in the early 1990's.

Unless you want to spend $4 for a quart of gas in a retail can at the hardware store for 100% gas, you cannot find a NO-ethanol filling station in OH or KY.
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Old 03-03-2020, 10:51 PM   #37
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The National requirement didn't happen until 2007. I don't intend to survey all 50 States to find out what State requirement were previously. My point was that small engine manufacturers have had a very long time to re-engineer their products to run on gas with alcohol and that is absolutely no longer an issue.
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Old 03-03-2020, 11:10 PM   #38
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While they can run on it fine, that has nothing to do with the phase separation of the fuel itself. Once it does that it doesn’t work very well.
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Old 03-03-2020, 11:15 PM   #39
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First, welcome to the forum!

Since the op is short on time now would be the time to find a small engine shop to fix the problem.

It sounds like he's flooding the engine, possibly damaged the float or main jet. He has gone from a running geny hunting to one that doesn't run any more. You seem to have some knowledge of engines but this has now gone fubar. Just for info, gas engines as a whole need 18 to 1 air/fuel mix to run, anything either side of this will make it run poorly or not at all, running above 18/1 is lean running and will burn out your engine.

On stabilizer, we have 26 or 27 small engines at the resort, genys, fire pumps, mowers, boat engines, etc; we don't drain we just put a double dose of stabilizer in the tank and run 5 minutes. No issues in 17 years I've been here.

To the op, go easy on the quick start, it will wash away any oil film in your cylinder and can damage the engine if too much used including blowing the head gasket or worse.


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Where did you get that A/F ratio
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Old 03-04-2020, 07:33 AM   #40
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The National requirement didn't happen until 2007. I don't intend to survey all 50 States to find out what State requirement were previously. My point was that small engine manufacturers have had a very long time to re-engineer their products to run on gas with alcohol and that is absolutely no longer an issue.

Apparently someone never told them as nearly every item purchased with a small gas engine, 2 cycle or 4 cycle, has stated in the owners manual NOT to use ETHANOL fuel of any percentage.
I NEVER buy the "crap gas" as it's known here for any vehicle or gas engine.
Sadly there have been a few times been forced to buy 'crap gas' as it was the only one available.
BTW alcohol bended gas was known as gasohol and was worse than ethanol blend sold today.
Ethanol blend is cheaper at the pump ONLY because the ethanol industry is subsidized with our tax dollars in billions of dollars annually. And ethanol blend gives poorer mile per gallon than 'real' gasoline in any vehicle been forced to use it.
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