I have had a 656 gas & 756 gas that had those electric fuel shutoffs. There is no fuel adjustment , either they're on or off , works or doesn't work. You can remove it & put in the old style needle valve if you want. I never tried it, some say it helps & some says it doesn't.
Sounds more like you have a restriction somewhere in your fuel supply. If you have checked your screen going into the carb & the one in the sediment bulb I would pull the sediment bulb housing out of the fuel tank & see if the inlet opening is plugged. On older tractors I like to put a piece of copper tubing into the fuel inlet of the housing so that it will stick up about 3/4" to 1" higher. That way if there's any crud in the bottom of the gas tank in the inlet will be above it.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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