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Old 11-18-2016, 12:54 PM   #1
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Brand: Thor Motor Coach
Model: ACE 30.1
State: Wisconsin
Posts: 51
THOR #3486
Starting an Onan 4000

Quick question....How long(seconds) would you say it takes to start your generator? Ours takes between 20-25 seconds and our dealer says its normal. They say the gas has a long way to travel before it gets to the fuel pump. I tried priming for different lengths of time but no difference. This is on a new 2016 ACE 30.1 that we have owned for 10 months and its been this way from day one.
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Old 11-18-2016, 01:22 PM   #2
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Brand: Thor Motor Coach
Model: Hurricane E34
State: California
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THOR #5924
You may want to go directly to the gen and prime it there and make sure you are hearing the prime, you could also pull the fuel line and see how long it takes to for the fuel to get to the carb.

Another thing you may want to start using Ethanol fuel treatment in the rig, I know first hand that todays fuel eats away the Onan carb parts, as I just sold my last Toy Hauler that after one time I missed using the fuel treatment it got gummed up and wouldn't start.
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Old 11-18-2016, 01:29 PM   #3
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Brand: Thor Motor Coach
Model: 2017 Vegas 24.1
State: Wisconsin
Posts: 57
THOR #3973
Onan 4000

Our 4000 sometimes takes over 30 seconds after priming. The unit times out after 30 seconds, we wait about 5-10 seconds and then it seems to start right away on the next attempt. It always takes longer when the unit has not been started in a day or so.

We spoke to an Onan rep at one of the many RV shows we've been to and he recommended that the unit needs to be primed for 20 seconds before starting (also found that recommendation in the Onan user manual).
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Old 11-18-2016, 08:50 PM   #4
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Model: Axis 24.1
State: Florida
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THOR #4366
Our 4000 is hard to start also. Has nothing to do prime or distance the fuel has to run. It's farther to the V10 and it starts right up. This is just more Onan dark ages starting tech.
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Old 11-18-2016, 09:20 PM   #5
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I continue priming for a couple seconds after the light comes on, try to start for about five seconds, repeat prime sequence then it seems to start right up.

If it has sat for a few months it might take three primes.
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Old 11-19-2016, 06:15 AM   #6
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Model: Hurricane 27K
State: California
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THOR #1226
After a month of sitting mine is hard to start. I crank it for about 10 seconds and then let it set for 10 more. It usually start right up after that.
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Old 11-19-2016, 08:27 AM   #7
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State: Pennsylvania
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THOR #4486
I am just glad that it starts even if it takes what is considered a long time. I believe Onan and Thor recommend starting the generator regularly which would also contribute to how long it takes to start the unit.
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Old 11-19-2016, 12:08 PM   #8
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Brand: Thor Motor Coach
Model: ACE 30.1
State: Wisconsin
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THOR #3486
Thank you for all your replies. It sounds like our generator is "normal". We do exercise it monthly and put in Seafoam if the same fuel sits in the tank for any length of time.
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