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 - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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