We have a 2015 Massimo MSU-500 EFI was running ok parked it for the night and it would not start the following day.
What I have checked so far:
fully charged battery and checked all fuses unplugged fuse connectors and checked connections visually
checked fuel pump and not getting ground signal for pump to run. i can run a direct wire to ground from fuel pump and it will pump
checked plug and is not firing
checked all of the wiring harness connections by unplugging and visually inspecting
did not notice any error codes on information panel

what else do i need to be looking for or checking. I have ordered a service manual, hopefully that will help.

thanks kf5wvj_rick