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Onan 4000 Randy 2-24-17  
I have a onan gen 4ykfa26100k in a horse trailer. It starts and runs like crap and smokes from fuel and all so spits fuel from carb throat.While its running i can unhook fuel line or unplug fuel solinoid and it will smooth out and run fine until it runs out of fuel.i have cleaned and soaked carb 2 times in chem dip new spark plug and have 150 psi on compression any ideas thanks
Re: Onan 4000 Bubba The Bus Tech 2-25-17  
I recommend you do four things: Do a seal check on your needle valve and check your float height setting.

Then check your fuel pressure, if someone put on a higher pressure electric fuel pump it will easily cause this.

Many of these Gensets had a fuel return line, if it is kinked or blocked the fuel pressure will be too high

Good Luck
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