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Old 11-04-2016, 04:31 PM   #1
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THOR #5409
Onan 4000ky turns over but wont fire to start

ANOTHER Onan 4000 ky question:
yes another question/problem
last problem solved with new fuel pump and oil level
NEW PROBLEM
Generator will turn over but will not fire to start.
Steps that I have taken to fix the problem
checked fuel pump. working
check fuel line - clean
Changed spark plug. working
Clean carburetor. Working
Gas tank full
oil level on the dot
wires are connected and working
used starter fluid to try to help start nothing.
turns over no fire
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Old 11-04-2016, 05:15 PM   #2
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Just a few thoughts.
When you say spark plug is working, have you verified that you have a spark?
If you do have spark, can you smell gas in spark plug hole?
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Old 11-04-2016, 06:32 PM   #3
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Originally Posted by mcr1010 View Post
Just a few thoughts.
When you say spark plug is working, have you verified that you have a spark?
If you do have spark, can you smell gas in spark plug hole?
no i do not smell gas but has spark
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Old 11-04-2016, 06:51 PM   #4
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THOR #1249
There is a rocker switch that has a prime on it. Try that and see if you can get some gas up to the carb and into the combustion chamber. Sounds like it is not getting the gas.
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Old 11-04-2016, 10:19 PM   #5
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THOR #2601
Don't know what model RV you have -- but, on my Vegas the Onan generator start switch is a rocker switch. One side to stop the generator the other to start it. If you press the rocker to STOP and hold it, it primes the generator. Hold the rocker until the red stop light flashes. Then press the rocker to Start. Mine starts every time.
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Old 11-04-2016, 10:24 PM   #6
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Model: Axis 24.1 KC's Big Box
State: Kansas
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THOR #3510
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Originally Posted by bevedfelker View Post
Don't know what model RV you have -- but, on my Vegas the Onan generator start switch is a rocker switch. One side to stop the generator the other to start it. If you press the rocker to STOP and hold it, it primes the generator. Hold the rocker until the red stop light flashes. Then press the rocker to Start. Mine starts every time.
Agree....often, we push start and it does not start immediately..push button again and it kicks over and is running !
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Old 11-04-2016, 11:19 PM   #7
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THOR #3952
Take the plug out, hook the wire to it and ground on the motor. Turn it over to check for spark. You can also squirt a little gas in the plug hole, put plug back in and try.
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Old 11-04-2016, 11:59 PM   #8
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THOR #5869
Had a similar problem, required taking the unit to repair center and found problem internal to unit. Fixed and has been working great.
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Old 11-05-2016, 01:33 AM   #9
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THOR #4282
Mine I have to take in to see whats going on but with mine it will not start unless the chassis motor is running. No idea why.
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Old 11-05-2016, 01:51 PM   #10
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Runs but now carburetor floods or runs weak
.
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Old 11-05-2016, 02:01 PM   #11
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THOR #5196
Sounds like you have a stuck float valve too, try gently tapping with a rubber mallet, that might free it up. Generators are sometimes sensitive to poor grades of gasoline. Go to TopTier.com and look at the available brands. I keep a list of dealers in my glovebox when traveling and don't buy anything but Top Tier brands.
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