Topic: 1936 Evinrude 4178 carburetor issues. A little help needed… – Page 2

This topic has 21 replies, 5 voices, and was last updated 3 years, 11 months ago by Geer Pyron.

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November 18, 2018 at 10:52 am #153205
huntleybill
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US Member - 2 Years
OK…so I found what I believe is the check valve at the bottom of the bowl. See pictures. I Let it soak in lacquer thinner for awhile, and blew it out. I then put the carb back together and attempted to run the motor. I have attached a youtube link so you can see it running. As long as I pump the primer, I can keep the motor running. As soon as I stop pumping, the motor quits. Notice when I pump, the fuel gushing out the top of the primer.

BTW, adjusting the needle did nothing.

Thoughts???
https://youtu.be/tO4TjNhne5U
- This reply was modified 5 years, 5 months ago by huntleybill.
November 18, 2018 at 11:09 am #153213
The Boat House
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- This reply was modified 5 years, 5 months ago by The Boat House.
- This reply was modified 3 years, 2 months ago by The Boat House.
November 18, 2018 at 11:54 am #153224
huntleybill
Participant
US Member - 2 Years
I’m not sure it was exactly that o-ring. I will order those and see if it makes any difference..
I can see how that might help with the fuel gushing out the top but how would it help the motor run better?
- This reply was modified 5 years, 5 months ago by huntleybill.
November 18, 2018 at 7:02 pm #153350
huntleybill
Participant
US Member - 2 Years
OK…with the help of a 3D printer, I made that O-ring and installed it. I have a lot less gushing out the top but the motor still will not run without drastically choking it. I went through the carb again and find nothing clogged but not ever working with this type of carb before, I don’t know if I got everything either.

Any other thoughts?
November 18, 2018 at 8:15 pm #153365
Buccaneer
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US Member - 1 Year (includes $3 online payment fee)
Only thought I have is that there’s about 20 members wishing that carb was
on their work bench so they could look it over! I’ll be curious to know what
turns out to be the problem!
Evidently there’s no parts diagram that exists for the model?

Prepare to be boarded!
November 18, 2018 at 9:56 pm #153389
huntleybill
Participant
US Member - 2 Years
Bring them over…we can all look at it together!
November 19, 2018 at 10:21 am #153621
The Boat House
Participant
- This reply was modified 3 years, 2 months ago by The Boat House.
November 20, 2018 at 11:39 am #154006
huntleybill
Participant
US Member - 2 Years
Thanks for sticking with me Mr. Tubs. I did blow air through the mixture screw and it does blow through the float bowl and the main jet. I also sprayed carb cleaner through the same way to make sure it is clean, then blew air through again. This is why I am confused. I believe I have all the ports clean but it still acts like something is clogged. ?????

Unless there is a port I am not aware of, I thought I had everything clean.
Maybe it is no longer a carb issue. Maybe the o-ring fixed the carb problem and it is now something else? But I have no idea what that other problem could be! It could be that I’m an idiot too!!! Naaaaaa… that can’t be! 🙂
November 20, 2018 at 8:17 pm #154118
The Boat House
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- This reply was modified 5 years, 5 months ago by The Boat House.
- This reply was modified 3 years, 2 months ago by The Boat House.
November 20, 2018 at 10:20 pm #154174
huntleybill
Participant
US Member - 2 Years
oh well…. I would hate to scrap this motor but if it won’t run, what good is it!
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1936 Evinrude 4178 carburetor issues. A little help needed…

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