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S1 is the master switch on the operating panel. Put it in the prime and run position (2:00 on the dial). The main fuel pump will be activated and fuel will run to the injectors and then back to the tank through the return lines. This is a good time to check for leaks. Crack the fuel line...

Make sure you fuel pump is pumping fuel. Just bought an 803a and the fuel pump was making noise but wasn't pumping any fuel. I swapped it out with the aux fuel pump and it fired right up. The aux pump is behind the side cover where the fuel fill is.