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So had to update. I FUCKING FIXED IT. What a long summer last year chasing this issue. Had to run it 3 times this summer just to confirm I actually ACTUALLY fixed it.

It was the IGNITION COIL....

Update, going to water test tomorrow.

New steps taken:

1) Replace ignition coil (cheap and easy)
2) Clean transmission oil cooler, not really clogged or anything. I just inspected each end....

When yours went into limp mode, did it make popping sounds after 2k RPM? My dealer said it would be 1200 RPM and there would be a buzzer. Other people online said it would be more akin to running...

Another update,

Unfortunately, it isn't related to the tan wire going to the temperature gauge. Pulled it and still had issues. Took 1.5 hours to for the issue to start happening today. Finally...

Did not replace the ignition control module, only the cap and rotor.

Got an update! Could use some help on these final steps.

Talking to a mechanic buddy and he recommended unplugging the tan wire w/blue stripe. It's some type of temperature sender that could be...

Ok, maybe I'll do that tonight. I haven't done it before, but I'm guessing you buy a fuel pressure gauge and hook it up somewhere between the pump and the throttle body?

Another update. The...

[QUOTE=Zkdk3000;129765]Hot days only? Could be vapor lock. When you're not in motion are you venting the engine compartment?

The boat restarts with ease every time, and the coughing/spitting...

Update:

Followed all fuel lines. Only one fuel water separator. On the new one I installed it is printed "fuel water separator/filter".

Ran hand along both lines from tank to to throttle body...

My fuel water separator was located on the aft side of the engine on the port side. It says "fuel/water seperator" WIX #33225. I'll go hunting for a fuel filter. Where is yours located?

Diagnosis recommendations? I can think of inspecting fuel tank/lines internally, external fuel tank, fuel pressure monitoring, and/or replacing fuel pump.

The fuel/water separator is the fuel filter unless I am mistaken?

Hi all,

I have an issue that started after being on the lake for several hours.

Boat: 2003 Supra Launch SSV 350 TBI (5.7L Vortec)

It consistently follows the same pattern:

1) Go on lake...

Thanks so much! We are looking at one this weekend so I just wanted to confirm.

Hi everyone. I'm looking to buy a 2003 Supra Launch SSV. The current representative selling the boat is unsure whether the boat has a ballast system.

According to these posts, A ballast system...