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Since you have had the IP off, double check the function of the pump internals and correct assembly of the cover to pump. The governor pushes the linkage back, turning the metering valve closed. This is also how the shutoff cuts fuel flow. If the linkage does not move forward under spring...

Try that lithium ion booster on the front battery to assure voltage during cranking.

Starting the engine will bring voltage down to 10.5 volts each..more voltage loss at the terminals. I have not measured the required voltage for the fuel shutoff solenoid but it is possible. Solenoid coils have a knack of pulling a good in rush current, causing significant voltage drop. Check...

Turning up the maximum fuel is something that should only be done if you have an exhaust gas temperature gauge. The plungers rarely get stuck to where it limits fuel. Smoke is not a good indication of maximum fuel, by the time you get smoke, you could be well over 1200 °F.