I recently turned up the starwheel to increase preboost fueling on our work truck now the truck will not start. It will puff black smoke start for about 3 sec then die. If i hit it with ether and floor it it will start then be fine the rest of the day. How do i fix this

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Its a fuel shut off solenoid

 

How did you tune it? The starwheel gives you full fuel at a certain PSI. The smoke screw determines the preboost fueling.

It does sound like your fuel shut off is going out.