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Kohler mechanical fuel pump question


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#1 wvbuzzmaster OFFLINE  

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Posted April 09, 2016 - 12:39 AM

On a mechanical Kohler K series fuel pump... Is it possible in it's design to let fuel into the engine crankcase? Or is the design bullet proof in that aspect? And lets just say it is pumping to the carb fine, is it possible that it pumps gasoline into the crankcase as well through some other failure only while running? Would this not create an overfilling situation in an engine crankcase that could result in it breathing a diluted gas/oil mix out of the breather due to an overfull situation. Engines always seem to seek their optimum fill level on their own somehow. And if checked the oil level and color may appear fine, but really be diluted because of gasoline having been pumped into the crankcase by the pump itself?





Yes wise guys, this is in reference to my New Holland S-14, just asking this question in another way. I just can not believe that condensation can replace oil this quickly, and still keep the fill level the same, especially if it is pumping out oil at a rate enough to soak the whole side of the engine, the tire, and catch the whole rest of the side of the tractor thru magic droplet splattering. Just not making sense. Havent torn into it yet, but will once I start getting some facts about the components.
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#2 KennyP ONLINE  

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Posted April 09, 2016 - 04:29 AM

Yes, the pump can leak into the crankcase! After running it for a while (half hour or more), pull the dipstick and see if you can smell fuel on it.


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#3 Alc ONLINE  

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Posted April 09, 2016 - 04:49 AM

Casey I think your on to something with the fuel pump to overfill the crankcase but what's causing your oil to turn milky ? Or is it so overfilled its foamy ?

#4 boyscout862 ONLINE  

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Posted April 09, 2016 - 06:39 AM

You may have two problems at the same time. The fuel pumps leak and it is a common problem. You just need to replace the diaphram. The breather may not be working right. It needs to be checked by the manual, use the troubleshooting guide. The first problem can cause the second problem.  Good Luck, Rick 


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#5 crittersf1 OFFLINE  

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Posted April 09, 2016 - 07:40 AM

If gas is diluting the oil that engine won't last very long. Does the oil smell like gas?


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#6 shorty ONLINE  

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Posted April 09, 2016 - 07:48 AM

Casey, in another thread there was a rebuild kit talked about for the fuel pump. I forget where it was tho. I wonder if that would work for you.
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#7 LilysDad ONLINE  

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Posted April 09, 2016 - 07:49 AM

http://then-now-auto...fuel-pump-kits/


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#8 shorty ONLINE  

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Posted April 09, 2016 - 07:55 AM

http://then-now-auto...fuel-pump-kits/

Thanks LD

#9 dodge trucker OFFLINE  

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Posted April 09, 2016 - 08:46 AM

I have seen the threads on the rebuild kits for them pumps, I have thrown away more Kohler pumps than I can remember, I wish I had them back now, I hate the plastic POS' which are all that is available new for them now a days... terribly "cheapened up" design.



#10 WrenchinOnIt ONLINE  

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Posted April 09, 2016 - 09:19 AM

As an alternative: http://kirkengines.c...ctronicFuelPump. Check out his billet cover for the OEM mounting hole as well. I'm a OEM guy , but a cantankerous engine/mechanical fuel pump combo led me to this conversion on a "worker" unit. No complaints
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#11 wvbuzzmaster OFFLINE  

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Posted April 09, 2016 - 10:25 AM

I had looked at that and I have an electric fuel pump on the hulk of the Caterpillar Craftsman that is 1.5 to 3 psi at 15-20 gph, has been sitting for long time, but would work, if no mud dobbers looked at it... And I may have a Kohler out there I am not using with the blank out plate... And really thinking it might be worth it to "just do it" and see if the oil stops breathing out of the crankcase breather. (Yes I would clean up the engine some so I can tell). If I do that before anything and the problems all seem to go away...

#12 shorty ONLINE  

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Posted April 09, 2016 - 10:28 AM

That would be an easy way to do a test.
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#13 glgrumpy ONLINE  

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Posted April 09, 2016 - 01:21 PM

Think the diaphragms on these get a hole in them and gas leaks to wrong side that is towards engine, leaks into case.  Ebay is full of those new plastic pumps, not sure if any good or not. Not cheap really, and have to get right one.  Was a place selling some kits, seems it was a boat place or something, but heard they no longer respond??  I've never done the electric way on anything I've owned, so can't comment on that idea.


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#14 LilysDad ONLINE  

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Posted April 09, 2016 - 02:37 PM

The 'boat place' sold out to the address I posted, GL.



#15 IamSherwood OFFLINE  

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Posted April 09, 2016 - 03:49 PM

Casey, before you do anything with the fuel pump, how about just

dropping the oil out of it, and let us have a sniff and peek.


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