The fuel shut-off solenoid on the C pump has two flat screwdriver slots on it. Two flat-ended screwdrivers will work to take it out. It just unscrews. Take it out and inside there is a little plunger and spring. If you take the plunger and spring out and then put the big piece back in - it is "run" position, all the time. You'll have to stall the tractor though - to shut it off.
I hope you realize that that C pump is obsolete and nobody in the USA has new parts to fix it. A few shops have used parts laying around and can patch those pumps up - but that's about it.
To put the better DB pump on the engine - you just need some adapters.
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