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Old 02-27-2016, 01:36 AM   #1
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Onan generator cranks but wont start

Hi- I have a 1999 Hawkins that has an Onan generator that cranks over real strong but wont start. I filled the LP tank but it still wont start. Any ideas? Thanks!
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Old 02-27-2016, 01:41 AM   #2
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It runs on LP? Did you run it out of LP and have you had it running before?

If the system was run out of LP, you may need to get the air out of the lines.

On my diesel Onan, you can prime the system by holding the switch in the opposite of start for one minute. Sorry, I don't know much about LP gen sets.
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Old 02-27-2016, 05:41 AM   #3
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I had an Onan LP genny in our 2006 WGO View. Really liked it because it was a lot cleaner than our current Onan gas genny.

No offense but did the tech turn off the LP at the tank when he/she filled it? I did that a few times and an expletive or two always jogged my memory. Also, as previously stated, clear the lines by turning on the gas cook top for a few minutes.
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Old 02-27-2016, 11:03 AM   #4
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I had the same issue with my on an lp gen. Ended up being a mud dobber built a nest in the lp regulator vent. The round pancake style regulator in the hose before the genset
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Old 02-27-2016, 11:43 AM   #5
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Quote:
Originally Posted by bcbrowne View Post
I had the same issue with my on an lp gen. Ended up being a mud dobber built a nest in the lp regulator vent. The round pancake style regulator in the hose before the genset
Totally forgot about that. There's a rubber vent tube somewhere near the generator. WGO sent all View owners a mesh "condom" to cover it to stop critters from building nests in there. Seems they love LP. First, run a coat hanger up the tube to dislodge the nest and dead bugs, then use a piece of panty hose or window screen to cover the end.
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Old 02-27-2016, 11:52 AM   #6
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Quote:
Originally Posted by Starhead View Post
Hi- I have a 1999 Hawkins that has an Onan generator that cranks over real strong but wont start. I filled the LP tank but it still wont start. Any ideas? Thanks!
Starhead
This troubleshooting guide was helpful when diagnosing and fixing my
6.3 KW propane generator.
https://www.flightsystems.com/pdf/on...oing-guide.pdf
Mel
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Old 02-28-2016, 08:01 AM   #7
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if you are getting spark and no fuel and have tried the above suggestions, either disassemble the regulator and clean or try a new regulator. I had a similar problem and it turned out to be black tar like residue from propane in the regulator. cleaned it up and no more problems
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Old 02-28-2016, 09:29 PM   #8
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Thank you!!!

I am very appreciative of all your responses and will give them all a try. I will let you know how it goes. Thanks again!!!
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Old 02-29-2016, 05:59 AM   #9
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The first thing I would do is take off the air cleaner, crank it over while squirting a small shot of starting fluid in the carb to see if it fires to see if it is indeed a fuel problem.

Then, if low pressure LP, clean regulator and carburetor.

If high pressure LP, clean carburetor.

I just went thru this with my propane high pressure LP generator. It was driving me mad. 240 bucks at an official Cummins/Onan didn't help much. I cleaned out the carb, which had quite a bit of oil in it from the additives in the propane. It fired right up after cleaning the carb with a can of cleaner. Be cautious taking it apart. There may be a diaphram that you do not want to damage.
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Old 02-29-2016, 09:29 PM   #10
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oil in propane

propane dealer told me that cheaper grades of propane have more of the black crud (oil) that's fine, I'll buy good propane..... right????? no way to tell except with a hydrometer and liquid propane, you gotta trust the guy you buy from.
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