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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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