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Cub 1811 kohler M18 gas in oil?

kohler cub 1811

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#1 Mark 149 J. OFFLINE  

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Posted October 09, 2016 - 07:56 PM

 I just finished rebuilding the carb. on my free cub 1811 today.  I also changed the oil and I noticed that the oil was very thin and it had a strong smell of gas.  My initial thought  was the float in the carb might have been stuck open which would explain why the spark plugs were fouled.  I also noticed that this engine has a mechanical fuel pump and was wondering if this style of fuel pump will fail and let gas into the motor like some of the old V8's did.  Does anybody know about this?

 

I don't want to start this engine up until I know for sure.


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#2 shorty ONLINE  

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Posted October 09, 2016 - 08:18 PM

If the seal is bad it can. I pulled one off a M18 this summer because the check valves were done for. Decided to go with electric pump.
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#3 olds45512 OFFLINE  

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Posted October 09, 2016 - 08:37 PM

the fuel pump is a common issue on the mags but only because there so old, if you replace it you will be just fine and trouble free for years to come. the kohler pump is kinda pricey so i went with this one and was real happy with it.

 

http://www.ebay.com/...=item20ce8b2a92


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#4 Mark 149 J. OFFLINE  

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Posted October 09, 2016 - 08:51 PM

[quote name="olds45512" post="718859" timestamp="1476063459"]the fuel pump is a common issue on the mags but only because there so old, if you replace it you will be just fine and trouble free for years to come. the kohler pump is kinda pricey so i went with this one

Do they make a rebuild kit for that fuel pump?
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#5 olds45512 OFFLINE  

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Posted October 09, 2016 - 09:21 PM


Do they make a rebuild kit for that fuel pump?

that question gets asked all the time and the answer is no, i guess they use to but it has been unavailable for a long time. 


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#6 Mark 149 J. OFFLINE  

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Posted October 09, 2016 - 09:36 PM

Okay thanks for all that helpful information!
Next step is to remove the old fuel pump and see what it looks like.
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#7 olds45512 OFFLINE  

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Posted October 09, 2016 - 09:40 PM

you can bypass the pump and run the line directly from the tank to the carb, it will run fine that way provided you don't let it go below half a tank, once it gets below half it doesn't have enough pressure for gravity feed to work. 


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#8 EricFromPa ONLINE  

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Posted October 09, 2016 - 10:04 PM

Just replace it with a new pump.Although Kohler wants $120+ for them you can get aftermarket pumps for $30 shipped.Factory part number KH-52-559-01 Aftermarket Stens Part numbers KH-52-559-03-S

 

http://www.ebay.com/...9-03-S&_sacat=0


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#9 Mark 149 J. OFFLINE  

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Posted October 10, 2016 - 12:04 AM

I removed the old fuel pump and worked it by hand but didn't see any gas leaking from the diaphragm.  I've decided to go ahead and replace it just for piece of mind.


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#10 shorty ONLINE  

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Posted October 10, 2016 - 05:13 AM

It's a shame I missed seeing those pumps when I was checking prices. One of the thoughts of getting an electric was it is cheaper than a mechanical. Now I see prices for mechanical for less than I got the electric for.
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#11 CRFarnsworth OFFLINE  

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Posted October 10, 2016 - 07:35 AM

I had a similar problem with a 782.  I replaced ti with an electric pump from NAPA.       Rick


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#12 chieffan OFFLINE  

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Posted October 10, 2016 - 08:13 AM

I picked up 2 electric pumps from Chine for $9 each plus shipping.  So far been working good on my Onan. They are a little big in physical size by don't put out a lot of pressure which is good.



#13 Mark 149 J. OFFLINE  

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Posted October 10, 2016 - 09:20 AM

Just replace it with a new pump.Although Kohler wants $120+ for them you can get aftermarket pumps for $30 shipped.Factory part number KH-52-559-01 Aftermarket Stens Part numbers KH-52-559-03-S

 

http://www.ebay.com/...9-03-S&_sacat=0

Thanks for the link! 

I've got one on the way.



#14 dodge trucker OFFLINE  

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Posted October 10, 2016 - 10:51 AM

I bought a pump for these engines from a guy on Feebay about a year ago. last time I looked he was still selling them. Brand new, but probably 30 years old. Metal body, in an ACDelco box, listed price is $50 with a best offer, he must have an "auto deny" setting on the best offer below a certain price. I put in an offer of $40 and instantly got a decline. I got it for a little less than his listed price but not much. I cant remember, but I think it was $45 or $46. same pumps fit the KT series and the Magnums. even the original pump that I removed was plastic. My engine ran a  whole bunch better with the new pump. something else I do, is that many of these machines were built with rubber fuel line from front to back, which deteriorates from the inside out. I take 1/4" steel brake line and replace that long hunk of rubber, and only use long enough stubs of rubber to connect the tube to the tank and the pump.


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