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tommy3horse

GT 14 fuel delivery issues

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tommy3horse

:ychain: Hello to all, especially the ones who have greater knowledge than I!

I continue to struggle with my GT 14 and trying to get fuel to the carb.

Everything is super clean, including the fresh carb. I can get fuel as far as the shut-off valve. Then it works its way across the front of the block and thru the Kohler filter and up to the carb.

Now, the motor is fresh, just rebuilt with all Kohler parts and a mechanic who still believes in doing it right. Anyway, the fuel pump is brand new and the newer plastic Kohler type. :ychain:

I can get the motor started by gently pressurizing the fuel tank. I guess this pushes just enough fuel to the pump and carb the let it idle fine. But if you try to adjust anything, including the throttle, it just quits :scratchead::hide:

I realize the fuel delivery equation does not include "gravity" :ychain:

What in the world am I missing. Please enlighten me before I become tommy2horse. :ychain:

THANKS!!

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N.C. horserider

:scratchead: Make sure the shutoff valve is not clogged. Check to see if arrow on the filter is going the right way, sounds dumb but in a hurry it happens. If you have clear tubing can you see the fuel in line? If you pull the line off at the fuel pump it should blow all the air out and fill the pump with a steady flow of gas.

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tommy3horse

Thanks Mike, I will try the clear fuel line. I will also leave the line from the pump off the carb to push the air out. :scratchead:

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kj4kicks

Sounds silly, but are you SURE the fuel pump isn't installed upside-down? that's a common mistake.

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tommy3horse

Anything is possible, but I will check that too. Thanks! :scratchead:

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tommy3horse

Hello again fellas;

I used the clear fuel line as Mike suggested,and saw the fuel go right to the new pump. However, not to the carb. At the time of the rebuild, the original cam was replaced because it was slightly out of tolerence. I pulled the pump off and stuck my finger in the hole and could feel the boss on the cam. I removed the spark plug and spun the motor by hand and to my surprise, found NO LOBE to drive the pump. The replacement cam came from another motor that must have been set-up with an electric pump. :hide::ychain:

Option #1: What options exist for an electric pump set-up?? Where would I even find one?

Option #2: tearing the motor apart and replacing the cam... again?

One way or another, I am comitted to success, any other ideas?? :scratchead:

Tom

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TT

Here's an option you missed:

Pick up one of these and mount it close to the front of the engine.

You can either buy an OEM Kohler fuel pump block off plate (Cub Cadets used them, so you might find a used one) or make one from 1/8" steel. (use the gasket for a pattern) Drill a hole and install a 1/4" barbed fitting in the center of the plate. (vacuum port for the pump) Bolt it on in place of your fuel pump, hook up 3 lines and go!

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tommy3horse

Thanks for the great suggestion TT. :scratchead:

Will there be enough vacuum to run it?

If so, I'll order one immediatly and fab-up a plate.

Thanks again, maybe there's hope afterall....

Tom

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TT

Will there be enough vacuum to run it?

Some of the early small Kohlers actually used vacuum fuel pumps as did many Tecumseh and Briggs engines.

As long as your engine is mechanically "well", there's no reason why a vacuum pump won't work.

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tommy3horse

Thats what I needed TT, some reassurance that this will be the thing that gets me going. The motor is very well indeed, fresh as a daisey! You got me fired up enough to go to the garage and play! Thanks again :scratchead: :hide:

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tommy3horse

Allright, I have decided to retain the originality of this GT 14. Do it right, replace the cam with one of two spares i have aquired for another project.

The tractor is very original including the motor and was cherished by the previous owner, until the rod broke.

I just wanted to say thanks for everyone's help. :scratchead:

I will be taking some pics soon...

Tom

St. Clair, Missouri

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