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Forgot all about Andy at SIM, used him a lot when I had a smaller boat. Just ordered the Candopro Yamaha Diagnostic tool from him, hoping that may shed some light on the issue and probably a good thing to have in my toolbox.

Blew fuse (5A) going to low pressure fuel pump, replaced, same thing. Decided to replace low pressure fuel pump, everything looked good (engine ran, did not bog down for 10+ minutes, then shutdown. Once again, fuse blown. Against my better judgement, installed a 10A fuse (which is shown in...