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Eletric fuel pump

kohler m18

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9 replies to this topic

#1 shorty ONLINE  

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Posted January 23, 2015 - 10:55 PM

I have this Gravely with a Kohler M18 in it. The fuel pump is very weak with both check valves leaking. So I am thinking of putting on an electric pump. 

Now the question is, Do you let the mechanical pump on? Pump the fuel through the old pump? Or take the mechanical pump off and put a plate over the hole.

 

How big of an electric pump will I need?



#2 gopher OFFLINE  

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Posted January 23, 2015 - 11:04 PM

Go to Kirk Engines lots of Kohler information and kits. In any case do not use high pressure auto pump.  


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#3 cpg OFFLINE  

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Posted January 23, 2015 - 11:10 PM

We had an old Bolens with a rear tank that didn't feed fuel very well and the vacuum pump died so instead we just got a universal 12v electric pump from an auto supply store. At the input to carb we just put a T and a return line back to the tank. That way once the carb filled it wouldn't just flood since the automotive pump will put out plenty of flow for a GT carb. It worked really well and from that point it became our ditch mowing tractor because it would always feed fuel really well on hills even without a full tank.

 

Just make sure if you do use an automotive pump to be sure it is for carbureted vehicles as they only run a few psi. If you try to use one designed for fuel injection you will end up having issues.


Edited by cpg, January 23, 2015 - 11:12 PM.

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#4 Bill 76 ONLINE  

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Posted January 24, 2015 - 04:54 AM

If its a mechanical pump and it not leaking oil I would leave it on I also would not run your new lines through it in case it starts leaking gas into the engine.  


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#5 shorty ONLINE  

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Posted January 24, 2015 - 04:58 AM

I hope to pick one up today. Got snow to move and another storm on the way.


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#6 Cat385B ONLINE  

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Posted January 24, 2015 - 06:33 AM

Napa 6101051 (plastic) or Napa 6101075 (metal) will work fine. They run 2-4 psi.
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#7 boyscout862 ONLINE  

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Posted January 24, 2015 - 08:35 AM

The mechanical pumps can usually be rebuilt. Someone in the Boston area is selling replacements pumps and kits. Good Luck, Rick


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#8 olcowhand ONLINE  

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Posted January 24, 2015 - 10:03 AM

I always switch to electric.  My reason is after a tractor sits a while, the carb fuel can evaporate.  With mechanical or vacuum fuel pumps, it can take a bit of cranking over before fuel arrives to the carb.....more wear on starter system, and can run battery down.  With electric pumps, turn the key to on a few seconds before cranking, and she'll light right off if all else is right.


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#9 shorty ONLINE  

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Posted January 24, 2015 - 08:11 PM

I was kind of thinking along that line too. It can easily go over a month that I won't use it. Then it is a pain to get started.



#10 Canawler OFFLINE  

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Posted January 24, 2015 - 11:12 PM

A few years ago, I did just what you're doing with my M18. I just bypassed the stock pump and left it in place as pulling it would have required pulling the engine to get the shrouding off. If it's not leaking oil out of it there's no reason to pull it.
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