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Aug 30, 2014Explorer
Run it under load until it shuts down. Immediately check the fuel line at the carb for fuel. If there's none, you've almost surely got a fuel pump failure. That was my first diagnostic procedure last year when I suspected pump problems on my Onan 2800; worked first try.
Another likely culprit is the voltage regulator. If you've got the service manual & a volt-ohm meter, there are step-by-step procedures in the manual for troubleshooting.
I also had a spark arrestor partly plug up once with somewhat similar results, but it'd restart immediately. Dunno if your 4000 has one or not.
Jim, "I'm not hard of hearing. I'm hard of listening."
Another likely culprit is the voltage regulator. If you've got the service manual & a volt-ohm meter, there are step-by-step procedures in the manual for troubleshooting.
I also had a spark arrestor partly plug up once with somewhat similar results, but it'd restart immediately. Dunno if your 4000 has one or not.
Jim, "I'm not hard of hearing. I'm hard of listening."
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