New to the forum guys, cut me some slack.

Having problems with the mud buddy 37 efi. Took it out fishing the other night, ran for about 30 minutes, turned it off. About a hour later I tried to crank it up and it turnes over just wouldn't crank. Thought I might've got water or junk in my gas so I took it home and drained it and put new gas and spark plugs in it and still wouldn't crank. Came out the next morning and it fired right up. Ran it for about a hour in the yard turned it off and it wouldn't crank back up??? Any help would be nice.

Something loose in your wiring harness more than likely. Take the front and side covers off and start shaking wires while you try to crank it.

I suggest bringing it to a service center to actually find the issue and repair it properly. It is under warranty and it will be fixed for you.

Does Mudbuddy have a mercury switch in the start circuit like GoDevil has?

I am not sure but EFI should be under warranty, if that is the case let someone else fix it for free. You could possibly void warranty by trying to fix it yourself. Just my 2 cents.

Had the same issue when mine was new. I looked at the fuel forwarding pump mounted under my hunt deck and a wire was not connected properly. When you turn the ignition on you should hear it click. If you don't hear that click that's probably your issue.