GT40 No Start

I think you said the pumps prime and the engine cranks.
Are you getting spark? I experienced similar problems and it turned out to be the coil. Standard automotive coil will work.

Nautique dealer we bought it from, only one around. The lanyard button definately activates the low pressure pump, and it cranks, would the HP be somehow controlled separately by that?.

I have a new to us '99 Air Nautique. This boat was so great for the first 50 hrs this summer, correct hull and storage for our family which has grown to 4, and the GT40 EFI which gave an amazing pull. I was hoping that it would be super safe/reliable compared to the '83 2001 that we have used pre-kids. But after 50hrs of phenomenal skiing it just started to die intermittently (at first after sitting for an hour or two of rest after morning sets while trying to go for round 2) then it just died and would not restart at all. I did the things that I saw as inevitable which I didn't mind: relays, cap and rotar, fuel filter, checked pickup in tank and antisiphon, had alternator tested, then I started getting a little more serious, putting pumps, regulator, even got ahold of a known-to-be-good ECM but to no avail! I do not have access to a STAR tester. At that point I got frustrated, brought it back to the dealership and three weeks later they told me they were going to put in a HP pump to which I said don't bother and took the boat back. Now mechanic #2 (good guy so far) has told me that the fuel pressure is just not there and he is also feeling stumped. My question is what do I do? I am going to meet and talk to mechanic tomorrow after work to talk about the plan/options. Anyone around Norther Illinois that can get this sorted out? Do I need to get my hands on the STAR tester to get to the bottom of this? What specifically could cause the pump to not run? I saw the info about the heat sinc (TFI) and the symptoms described in that post are resembling my scenario almost exactly. Please help, summer is slipping into fall and away....