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Is It Bad Or Am I Missing Something

kohler fuel pump

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#1 alans650A OFFLINE  

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Posted May 11, 2013 - 04:44 PM

I have a '96 Sears garden tractor with an 18HP Kohler MV18 engine in it, vertical shaft.

It started and ran 3 weeks ago, when I went to use it last weekend it would not starting.

Engine turns over but never starts, gave it a shot of ether, it starts but does not stay running.

With all the trying to start I never smelled any fuel. Opened the fuel line before the filter good flow, after the filter pretty good to but to be sure I changed the filter still will not start.

Today I pulled all the covers off the motor, took the fuel line loose from the carb and turned the engine over for a good amount of time, never got any fuel out of the fuel line.

This to me points to the fuel pump.

Is there any other test I could do to verify the fuel pump is the problem.

Pump is $80 buck, hate to spend the money and have it not be the problem.

Also has anyone been successful with using an electric fuel pump on this engine.

TIA

Alan


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#2 olcowhand OFFLINE  

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Posted May 11, 2013 - 05:10 PM

You definitely can use electric.  Get a low pressure pump, 1.5 to 4psi or so.  Here is one that will be good for your application:

http://www.ebay.com/...d=380616367220


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#3 olcowhand OFFLINE  

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Posted May 11, 2013 - 05:12 PM

Check your vacuum supply hose from the engine block to the fuel pump.  Could be it just came off or split.  



#4 alans650A OFFLINE  

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Posted May 11, 2013 - 05:16 PM

Check your vacuum supply hose from the engine block to the fuel pump.  Could be it just came off or split.  

From what I can tell by looking and the parts book, the pump is mechanically drive by the engine much like cars used to be.

But will take a closer look.

Thanks



#5 alans650A OFFLINE  

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Posted May 11, 2013 - 05:17 PM

You definitely can use electric.  Get a low pressure pump, 1.5 to 4psi or so.  Here is one that will be good for your application:

http://www.ebay.com/...d=380616367220

Thanks will take a look at it.

So it sounds like a fuel to you as well?



#6 olcowhand OFFLINE  

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Posted May 11, 2013 - 05:19 PM

Oh yes, I think it is a mechanical pump, and I should have remembered.  Either the pump or a blockage in the tank I'd say.  Try taking off the fuel line from the pump.  If it's getting fuel, then it's the pump.  Try blowing back to the tank to be sure it's clear.



#7 alans650A OFFLINE  

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Posted May 11, 2013 - 05:25 PM

Oh yes, I think it is a mechanical pump, and I should have remembered.  Either the pump or a blockage in the tank I'd say.  Try taking off the fuel line from the pump.  If it's getting fuel, then it's the pump.  Try blowing back to the tank to be sure it's clear.

I have good furl flow through the filter which is about 1/2 from the tank to the pump, i will pull the line off the supply side of the pump and blow back to the filter and see if that section is blocked. But there has always been a filter in place.



#8 Guest_gravely-power_*

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Posted May 11, 2013 - 05:38 PM

Slow down, take a deep breath, and Clean the fuel pump. The one way valves, in and out. take very little slime or gunk to stick them open. I have saved dozens of them over the years by cleaning. One of the toughest fuel pumps on the market ever.


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#9 alans650A OFFLINE  

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Posted May 11, 2013 - 05:57 PM

Slow down, take a deep breath, and Clean the fuel pump. The one way valves, in and out. take very little slime or gunk to stick them open. I have saved dozens of them over the years by cleaning. One of the toughest fuel pumps on the market ever.

The book I have does not show an exploded view of the pump itself.

My guess is take the pump off the engine and split it at the 4 screws, check and clean the parts inside?


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#10 Guest_gravely-power_*

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Posted May 11, 2013 - 07:20 PM

The book I have does not show an exploded view of the pump itself.

My guess is take the pump off the engine and split it at the 4 screws, check and clean the parts inside?

Yup! you got it.


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#11 alans650A OFFLINE  

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Posted May 11, 2013 - 08:18 PM

Yup! you got it.

I will give it a shot, will not be able to get to it till Monday night.



#12 alans650A OFFLINE  

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Posted May 13, 2013 - 08:34 PM

Pulled the pump off the engine and split it.

Found the discharge side valve out of it's location and sitting on the metal disc in the center of the diaphragm.

Not sure how it got out, really had to apply pressure to get it back in.

Pulled out the other valve as well, sprayed both with carb cleaner, the pooled some on the valve disk, neither one leaked.

Put it back in the engine, cranked it a few times with the fuel line off the carb, got fuel good flow too.

Put the fuel line on the carb and it started fine.

Thanks to all for your help.
While it is so much apart going to put on new fuel line, filter, plugs and change the oil and filter.

Have another question, fuel line looks like 1/4" correct?

Also I noticed that there is a lot of grass that gets pulled up into the head covers by the fan and there it stays.

Would it not run cooler leaving them off, I will put the top shroud on as that holds all the cables in check.

Good idea or bad?

Thanks again for the help.

Alan


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#13 MH81 OFFLINE  

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Posted May 13, 2013 - 09:18 PM

As a rule, tins are put there to direct air flow for correct cooling. If you see a flaw to the design, attempt to correct by keeping debris out (mesh, screen, etc) but I would not normally advise tins removal unless there isn't a better way.
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#14 pigsitter OFFLINE  

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Posted May 13, 2013 - 09:19 PM

Leave the covers on as they route the air over the head to help keep the engine cool, just pull them off and clean out any debris every so often.



#15 alans650A ONLINE  

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Posted June 09, 2013 - 05:02 PM

Ok bump this back up the list.

Tractor has been running fine since I fixed the fuel pump until today.

Engine stalled and would not restart, pushed it back to the barn and took off the fuel line to the carb, no fuel while cranking.

Pulled the fuel pump and split it, found the same issue, discharge valve was out of it's socket same as before.

Has anyone ever seen this problem before.

Thought about putting the valve back in and JB Weld it in place, not sure what is causing it to come out?

Or should it just be replaced with a new one or an electric pump?

Thanks

Alan







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