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Gas blowing out of carb


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#1 Vaughn726 OFFLINE  

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Posted August 27, 2016 - 08:18 AM

 Hi all. Cub Cadet 2146 with the 14hp Linamar (Onan) engine. Will crank and run but spits back out of the carb at idle. Seems to level off at higher r.p.m. but still pours gas out of the carb. It has a Nikki carb that has been taken apart and cleaned. 

  I checked and adjusted valves to .006.   I would like to check timing but can't find the timing marks. Any help or idea on why I have the back fire, spitting gas problem would be appreciated.


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#2 MH81 ONLINE  

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Posted August 27, 2016 - 08:22 AM

Sounds like float level or float failure to me.
Does it have an electric fuel pump, by chance?
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#3 Vaughn726 OFFLINE  

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Posted August 27, 2016 - 08:46 AM

Thanks for the reply. No sir, not an electric fuel pump. It runs well at full throttle and cuts good but it blows and leaks a bunch of gas. I cleaned and checked the float and needle valve and it seems to be working. It only leaks when running. 

  Also, it is a nikki carb so no adjustments on float or jets.


Edited by Vaughn726, August 27, 2016 - 08:47 AM.

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#4 larrybl OFFLINE  

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Posted August 27, 2016 - 09:06 AM

Yep, crud in the carb somewhere, https://www.youtube....h?v=-XwxYD5_kBc

 

This was my culprit.

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#5 Vaughn726 OFFLINE  

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Posted August 27, 2016 - 09:15 AM

Thanks for the reply. I've had the carb off twice. Cleaned both times and can't find any thing in any passages or in or around the needle and/or seat.


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#6 chieffan ONLINE  

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Posted August 27, 2016 - 09:31 AM

Having the same issue with an Onan with new electric fuel pump.  Worked fine with the old weak pump but when it gave out and put the new one on it floods at all speeds.  New needle and seat will be here today.  Hopefully that will fix the problem.  Been regulating the fuel flow with the shut off valve.  Tricky.


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#7 ol' stonebreaker OFFLINE  

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Posted August 27, 2016 - 09:35 AM

  I had an 8 HP Briggs doing that and finally found the intake valve was sticking just enough to not close completely yet  it still had enough compression to start. I fed a bunch of Marvel oil straight into the carb intake while at WOT for about 30 seconds and the problem went away. All the bugs and mosquitoes went away while doing this, LOL!!

                                    Mike


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#8 Vaughn726 OFFLINE  

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Posted August 27, 2016 - 09:37 AM

Problem is that from what I read the needle and seat can't be replaced on the nikki carb. This isn't the first nikki I've had problems with. Dealer said the only cure for this carb is to replace it and hope it's a good one.


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#9 crittersf1 OFFLINE  

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Posted August 27, 2016 - 09:50 AM

Time for a new carb


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#10 larrybl OFFLINE  

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Posted August 27, 2016 - 08:42 PM

Here is another Carb issue I had. Cleaning fixed it. https://www.youtube....h?v=myyie42Lmdk


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#11 Vaughn726 OFFLINE  

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Posted August 29, 2016 - 12:41 PM

Update........changed carbs and it now runs great except it is dripping gas out of the bowl. A pretty good amount. The carb was clean and it ran great on the other mower with no leaks. Would it be possible that the fuel pump is pumping too strong? Is there a pressure test for the pump? This is a picture of the pump.          http://www.manualsli...?page=32#manual

 

Would it be possible to use a regulator of some sort? The mower runs and cuts great except for the gas pouring out.

Would a pump for say a Kohler work? They are $20.00 and the Cadet is over $100.00


Edited by Vaughn726, August 29, 2016 - 12:57 PM.

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#12 larrybl OFFLINE  

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Posted August 29, 2016 - 06:22 PM

That looks like a regular pulse pump so it would be low pressure. I would check the bowl fit and gasket.


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