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Old 03-09-2018, 02:15 PM   #1
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Default 5.7 bogs out and dies

JUst purchased a 2700 my 5.7 liter runs fantastic for about 1 hour then sputters and eventually dies, any ideas?
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Old 03-09-2018, 06:19 PM   #2
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Need more info on the engine. What year and model? Carburated?
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Old 03-09-2018, 08:03 PM   #3
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Welcome aboard

As stated what year and is it carb or MPI?

However based on running good for one hour then dies sounds like a blocked fuel tank vent. Next time it dies open the fuel fill cap, if there a rush of air and the engine now runs the tanks vent is clogged.
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Old 03-11-2018, 12:25 PM   #4
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Its a 1997 5.7, carburated, its funny every one says vent hose. I removed it from tank an could blow out no problem, so yesterday im sitting here thinking i was able to blow out no problem but i never tried to blow in from outside down to tank! Took out the anti siphon valve thinking it was hanging up, it did the same thing. Thinking of installing an electric fuel pump, dont really want to. Iwould rather find an fix the problem. The motor is a complete rebuild on a new block with 40/hrs runs fantastically smooth for 50-60 minutes
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Old 03-11-2018, 05:29 PM   #5
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Could be the fuel pickup in the tank. Might be gas stirring up the bottom and plugging the line. I would also check fuel filter that is in carb where the line comes in.
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Old 03-11-2018, 05:59 PM   #6
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Could be the coil heating up and failing ... But, since it's a fresh rebuild i would assume the coil is new as well.
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Old 03-11-2018, 06:47 PM   #7
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Had the pickup line out, it was clean really clean, we changed the fuel filter 3 times havent checked the carb one is it just a screen in the fuel line? If it was any of the filters i wouldnt think it would fun 1 hour fine for 3 days in a row. Starting to think its electric
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Old 03-11-2018, 08:12 PM   #8
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Switching to an electric fuel pump will not fix the problem.

It could be the coil heating up or the ignition sensor in the distributor, both are know faults to electrical issues once the engine is warmed up.
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Old 03-12-2018, 11:08 AM   #9
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What does the inside of your distributor cap look like? I rec calling ignition system manufacturer and ask if that system is appropriate for your application. That sounds likes the problem to me, if... you are certain that there is no gas tank vent problem.
Next time you take out your boat, try opening the gas cap every 15 minutes or so.
If not vent problem or ignition system mismatch, next suspect is loose wire in ignition system.
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Old 03-12-2018, 12:16 PM   #10
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If it were a vent line clog, it would be in the through hull the vent line connects too. The screens are known to corrode, and occasionally be the home for insect nests. You did say you disconnected the vent line from the tank and tested. I assume the vent line was still connected to the through hull at the time?
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