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Old 03-09-2012, 06:53 PM   #1
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onan generator, 4000

My generator only has 3 hours run time on it, but the coach is a 2010. It will start, but run for only a few seconds and stop. Anyone know what the problem is? Suggestions on where I start.

Thanks,

Whitail
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Old 03-09-2012, 07:06 PM   #2
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Not sure how new to RV'ing you are so I'll toss out an easy one first. How much fuel do you have in your tank(s)? If it goes below a specific amount the gen will not run. Prevents you from running out of fuel by running the generator.
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Old 03-09-2012, 07:11 PM   #3
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Thank you, tank has plenty of gas. What next?
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Old 03-10-2012, 12:02 AM   #4
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Check the error codes? When it stops the control panel should flash error codes, then check those against the owner's manual.
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Old 03-10-2012, 03:59 AM   #5
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If it sat for a long time without being run, it could have gummed up the carburetor.
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Old 03-10-2012, 05:03 AM   #6
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Quote:
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If it sat for a long time without being run, it could have gummed up the carburetor.
Scary. That's what I was thinking
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Old 03-10-2012, 05:34 AM   #7
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I would start with checking for fuel problems such as fuel filter, fuel pump, carb, air filter 3 hours run time in about that many years a clear indication of some thing clogged
up.
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Old 03-10-2012, 06:12 AM   #8
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Hold the start switch in the start position for another 2 or 3 seconds after it starts... It has to tell module it's running and to turn the fuel pump on
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Old 03-10-2012, 06:44 AM   #9
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I assum you have checked the oil level also. It will shut down if it is low. To check the dip stick should not be screwed in or you will get a false reading.
In many systems the genny will be shut down by the ECM if there is no load sensed.
The easiest way to check for a bad pump or clogged fuel filter is to disconnect the line at the carb and hold in the prime button. There should be a steady flow of fuel, and no hammering sound from the pump. Good luck
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Old 03-10-2012, 09:13 AM   #10
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In many systems the genny will be shut down by the ECM if there is no load sensed.
Most transfer switches have a time delay and won't put a load on the genset for 20+ seconds. If it shuts off before it switches, it is not a no-load problem.
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Old 03-10-2012, 09:17 AM   #11
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could be 1 of 3 things spark plug,spark plug or the spark plug.try replacing the spark plug first.its only a couple of $$ for a new spark plug.
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Old 03-10-2012, 09:20 AM   #12
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As posted above about the 5 second rule.
When the engine has started still hold the start button in for 5 seconds then release.
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Old 03-10-2012, 09:37 AM   #13
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I vote for the carb. Did you put conditioner in your gas for storing. If not it's probably a stuck float. Disconnect the fuel inlet inlet line and inject a short burst of air to dislodge it. Squirt some carb cleaner in it before connecting it back up. I started using Stabil all the time whether my rig is going to sit for an extended period or not. I also added gen. run to my maint. list. I usually do it twice a month for 30 mins. at a time.

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Old 03-10-2012, 10:02 AM   #14
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Another thing to remember is in most cases the genny will not continue to run if hooked to shore power.
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