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Tjohnson1258
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2018/05/11 11:11:45 (permalink)
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'Wits End' AFTER switch to ethanol free

I recently decided to make the switch from regular gasoline in my small engines to ethanol free gasoline. My equipment was difficult to start and wouldn't run very well due to gum deposits I'm assuming from ethanol.

I took my lawn equipment and I broke it all down, opened up the carburetors, replaced the pieces with carburetor repair kits, or replaced the carburetors altogether. I cleaned it all up with carburetor cleaner, cleaned out the crevices, and use compressed air to blow out all the junk particles. So I put my carburetors back together nice and clean with new parts. I bought cans of ethanol free fuel with the oil mix already included and used the appropriate one for each piece of lawn equipment.

They ran great for three or four times. Now my Stihl backpack blower and my echo weed eater won't start. Why would they run so great for three or four times on that good quality fuel after breaking the carburetors down and cleaning them, and now they won't even start?

Thanks for any help.
Tyler
Mikel1
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Re: 'Wits End' AFTER switch to ethanol free 2018/05/12 10:58:29 (permalink)
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Are the ones with new carbs having problems as well?
Tjohnson1258
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Re: 'Wits End' AFTER switch to ethanol free 2018/05/12 13:08:50 (permalink)
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Yes. Stihl blower new carb.

Echo weed eater, carb kit.
Mikel1
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Re: 'Wits End' AFTER switch to ethanol free 2018/05/12 13:54:07 (permalink)
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So if you put a little fuel in carb, will they try to start?
Tjohnson1258
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Re: 'Wits End' AFTER switch to ethanol free 2018/05/12 23:08:05 (permalink)
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Haven't put too much time into blower, but weed eater I tried spraying starter fluid in and it still won't. I might not be doing it right because it's hard to get it in such a small hole.
But remember, they worked great for a few uses. Now it's like this new ethanol free fuel bogged them down. I have to take the weed eater carb apart again because the primer bulb does not seem to be pushing fuel like it should.
Mikel1
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Re: 'Wits End' AFTER switch to ethanol free 2018/05/13 00:02:54 (permalink)
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Did you replace fuel filters as well? Also may want to check spark arrestor, they can clog up, just a thought.
Tjohnson1258
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Re: 'Wits End' AFTER switch to ethanol free 2018/05/15 10:31:13 (permalink)
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Yes, did a complete overhaul on both since I was switching to the good quality fuel. I was very meticulous (or so I thought) to avoid problems like this.

One thing I did notice, both seemed to seep fuel out of the carb into the air filter. Once they had difficulty starting and I began to dismantle them, the air filters were soaked with fuel. What's the deal? I never tipped them over or anything.
AVB
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Re: 'Wits End' AFTER switch to ethanol free 2018/05/15 16:42:39 (permalink)
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Most Echos use reed valves on the intake side so spraying fuel mix or starter fluid into the carburetor throat will not work. Only direct injection into cylinder works.
 
When you rebuild both carbs you did set the new metering lever and installed the gaskets and diaphragm in the correct order?
 
As for the fuel seepage did you pressure the fuel pump side of the carburetor cubes? I am sitting here right now with a C1Q-W11D that is leaking fuel and there is nothing that can be done for it as it is the needle seat that is leaking.
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Re: 'Wits End' AFTER switch to ethanol free 2018/05/16 21:46:21 (permalink)
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Hmm, I use stihl and use premix when not using much. If using alot use ethanol mix 50 to 1 ratio and don't have any problems.
AVB
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Re: 'Wits End' AFTER switch to ethanol free 2018/05/17 08:22:28 (permalink)
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I actually strictly 10% ethanol blend here in my shop with a Pro Multi Mix oil that contains the stabilizers and other additives for the fuel systems. It goes into anything using from 50:1 to 16:1 so I don't have but fuel can with 2 cycle mix; saves a lot of headaches. Be careful of the convenience fuel oils as I have seen multiple customers with problems using these.
Jonnywalter
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Re: 'Wits End' AFTER switch to ethanol free 2018/06/04 04:35:45 (permalink)
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Do a compression test on the cylinder of weed eater . Odds are when you were running the machine with a plugged carb you had a lean burn condition and as such didn't have the proper amount of fuel going into the cylinder which can cause the cylinder head to burn . The fuel acts as a cooling agent for the engine and if theres not enough fuel in the cylinder it doesn't get the cooling it needs . If the cylinder head is burnt you wont have proper compression. Hope this helps
That work for and my Echo SRM 225 Trimmer.
Jon
post edited by Jonnywalter - 2018/06/07 03:08:02
Tjohnson1258
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Re: 'Wits End' AFTER switch to ethanol free 2018/06/04 13:16:27 (permalink) ☄ Helpfulby Jonnywalter 2018/06/04 14:06:23
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So after several times of breaking them down and troubleshooting, I think the problem may have been simple, and I just couldn't wrap my head around it. The old fuel had the lines and the carb all hummed up probably. I knew how to get it working with the old ways. It was old and tired, but I was able to get them running with tried and true methods.

So after my complete overhaul of everything carb and fuel related, the machines were much more efficient. Also, I only was using the correct premix I bought in the can, the good stuff, ethanol free. I continued to try and start them the same old way.

Not good, I kept flooding them. I had to adjust the way I start them since the new equipment was so much more efficient. They now take very little priming.

However, I still have troubleshooting to do because the weed eater seems to not want to stay running if I try and restart after it's been working for a while. I'm learning that new clean equipment and new clean fuel also comes with their own NEW sets of problems.

Thank for all the replies, if you have any other advice please let me know.
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