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  #1   IP: 209.121.229.215
Old 08-13-2022, 01:30 AM
Marty Levenson Marty Levenson is offline
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Shuts down after 1 minute

Wondering where to start troubleshooting. Engine ran great in June, but now, after recent exhaust rust out and rebuild, starts fine and then dies after one minute or less....then won't restart. When I come back a few days later, same behavior.
Shut down is sudden. I see plenty of oil pressure when I'm cranking.(yes, closed the water intake). Turns over strongly.
Engine is fresh water cooled, electronic ignition, electric oil pump.
OPSS? Seems too quick to be an overheating coil. Seems like an electric problem, but not certain.
1- tempted to jump the OPSS
2 - if that doesn't fix it, replace the coil
3 - check the spark at the main coil lead.
Any suggestions are gratefully received!

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Old 08-13-2022, 03:41 AM
tenders tenders is offline
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Are you sure the fuel valve is open?
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  #3   IP: 100.36.81.23
Old 08-13-2022, 02:40 PM
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edwardc edwardc is offline
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One minute is about the time (depending on throttle setting) that the engine will run on the gas that is in the carb float bowl. Check that your fuel pump has sufficient pressure AND flow.
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  #4   IP: 104.174.83.118
Old 08-13-2022, 03:04 PM
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Marty, it seems to me the first thing to do is determine if it is fuel or spark related. Either are easy to determine at the time of shutdown. Only then can you take a logical approach to troubleshooting rather than guessing.
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  #5   IP: 32.211.38.220
Old 08-13-2022, 03:35 PM
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Al Schober Al Schober is offline
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Agree with Neil - Give it a shot of starting ether when it quits, then try it. If it stays dead, it's spark. If it roars for a bit, it's fuel.
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  #6   IP: 138.207.177.95
Old 08-14-2022, 09:49 AM
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The ether trick works.
Also I have to throw in the 534th recommendation for a fuel pressure gauge. Mine has paid for itself over and over again.
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