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Old 07-04-2015, 02:16 PM   #1
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Need generator advice

I am not familiar with generators so need a little advice. We have an Onan 4000 Genset emerald plus. It cranks but wont start. Any suggestions please?
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Old 07-04-2015, 02:37 PM   #2
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Originally Posted by janellemay67 View Post
I am not familiar with generators so need a little advice. We have an Onan 4000 Genset emerald plus. It cranks but wont start. Any suggestions please?
First, verify you have well over a 1/4 tank of fuel.

With compression, spark and fuel, it should at least make an effort to light off. The easiest methods to narrow down are as follows;

Spray a little starter fluid in the intake track and see if it attempts to fire off...

...Yes? More than likely a fuel delivery problem, either gummed up/dirty carb, bad fuel pump, fuel filter and/or vac leak...

...No? Check for spark with an ignition tester or remove and ground the sparkplug while another momentarily cranks the starter over visually inspecting the plug gap for a bright blue arc. (KEEP AWAY from the sparkplug hole/flammables!)

No spark? Try another plug...no spark? Ignition problem. Further diag req'd.

Good spark and still No start with starter fluid? Check compression and/or leakdown test.

If fuel and air enter in the ballpark of the right ratio and you got sufficient squeeze (compression), old sparky should light her off assuming nothing else is major off.

Good luck!
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Old 07-04-2015, 11:46 PM   #3
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Originally Posted by cutlooselily View Post
First, verify you have well over a 1/4 tank of fuel.

With compression, spark and fuel, it should at least make an effort to light off. The easiest methods to narrow down are as follows;

Spray a little starter fluid in the intake track and see if it attempts to fire off...

...Yes? More than likely a fuel delivery problem, either gummed up/dirty carb, bad fuel pump, fuel filter and/or vac leak...

...No? Check for spark with an ignition tester or remove and ground the sparkplug while another momentarily cranks the starter over visually inspecting the plug gap for a bright blue arc. (KEEP AWAY from the sparkplug hole/flammables!)

No spark? Try another plug...no spark? Ignition problem. Further diag req'd.

Good spark and still No start with starter fluid? Check compression and/or leakdown test.

If fuel and air enter in the ballpark of the right ratio and you got sufficient squeeze (compression), old sparky should light her off assuming nothing else is major off.

Good luck!
Thanks so much☺
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Old 07-04-2015, 11:52 PM   #4
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Here is the manual on the one you have.


https://www.cumminsonan.com/www/pdf/...s/965-0128.pdf
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Old 07-05-2015, 03:17 PM   #5
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Originally Posted by janellemay67 View Post
I am not familiar with generators so need a little advice. We have an Onan 4000 Genset emerald plus. It cranks but wont start. Any suggestions please?
We have a Onan 4000 on our Minnie and had a hard time starting it until we were at the Winnebago factory for some repairs and the Tech showed us that we needed to hold down on the Stop side of the switch for 15-20 seconds before we try to start the generator from a cold start. This primes the carb with gas and makes the generator easier to start. Prior to that we would crank the generator several times before it would start from a cold start. Hope this helps.
Pete
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Old 07-06-2015, 02:34 AM   #6
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We have a Onan 4000 on our Minnie and had a hard time starting it until we were at the Winnebago factory for some repairs and the Tech showed us that we needed to hold down on the Stop side of the switch for 15-20 seconds before we try to start the generator from a cold start. This primes the carb with gas and makes the generator easier to start. Prior to that we would crank the generator several times before it would start from a cold start. Hope this helps.
Pete
Thankyou Pete
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Old 08-07-2015, 03:25 PM   #7
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Sounds like everyone is under the same impression. The rocker switch is a 2 way. push down on the rocker switch till the light on the top lights up. Then let go. It is now primed. Push up starting the genny. Make sure you have 1/3 of a tank of fuel and no load on the electricals.
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