[TwoToTango]

Own a 1995 Tiara 3100 open since day 1. Rebuilt the 454 in 2016 at 1000 hours. Now have aproblem with STBD engine, starts, runs and suddenly without any indication shuts off, will not restart for same time, than starts and does the same any thoughts?

[Ken Grabowski]

I have 99; 454 EFI,  any mystery problems I have had has gone to the relay switches, and wiring. Or the distributor shaft. 
Rebuild at 1000, seems pretty low for that.

[TwoToTango]

yes its low but they were 20 years old, thinking of ripping them and put 2 yanmar diesels in

[Ken Grabowski]

yes its low but they were 20 years old, thinking of ripping them and put 2 yanmar diesels in

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I’ve got 2600 hours. Still going strong, had top ends done at 1500, but it is fresh water.
Yanmars would make it rocket ship.

[Misdirection]

Own a 1995 Tiara 3100 open since day 1. Rebuilt the 454 in 2016 at 1000 hours. Now have aproblem with STBD engine, starts, runs and suddenly without any indication shuts off, will not restart for same time, than starts and does the same any thoughts?

The first thing I would check is electrical from the dash to the motor. My friends 95 37' Silverton Crusader did something similar to what your describing. The "run" wire from the ignition back to the motor had a bad connection and intermittently would shut the motor off and wouldn't restart. Then later would fire right back up. They chased everything on that motor for half the summer before finding it.

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Oh, and my Crusaders are 34 years old, over 4300 hours now. Had a valve job on them back around 2500ish hours. Still purr like kittens...

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[Redarrow32]

It may sound silly but you need to get to the root problem. Is it electrical or fuel related. The electrical solutions above sound possible. If it is electrical does heating the engines up have anything to do with it, (you said it would run then quite). I have also witnessed fuel problems for this also. The vent for the fuel tank was plugged by mud dobber wasps. While the fuel was being consumed by running, there was no air venting into the tank. When enough fuel was depleted it created a negative pressure in the tank and the engine would quite. Let it sit for a while, and the air pressure equalizes allowing fuel to flow again and the engine will run.

[RCKLAW]

I had a similar problem that took forever to diagnose. Turned out to be a defective anti-siphon valve in the fuel tank serving that engine..

[ReelEnjoyment]

If the fuel tank vents are plugged it can be diagnosed by loosening and tightening your fuel filter caps

[Matta0413]

Does it sputter and die or just die?

[lakesidevu]

Check your temperature switches for the engine and transmission.
Check that they are plugged in correctly and contacts are clean and working