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Look on the top of the fuel filter for a white knob that will unscrew. That is a manual pump.

Crack the nuts on top of the injectors. Use that pump until no bubbles come out of the cracked fittings.

Some generators may have had an electric switch added to power the fuel pump.

If you don’t have either of the methods of pumping the system. Crack the injector nuts and crank the engine over. You may have to do it several times. Don’t engage the starter for more than 15 seconds at a time.

I’m familiar with the screw on top of the water separator housing.  Do I unscrew that, crack the nuts on the injectors, and then press the start switch to spin it over??  I guess I don’t understand how this manual pump works