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SMarquez's avatar
SMarquez
Explorer
Jul 31, 2014

Another No Start Onan

I started out with a no start Onan 4000. Not even a pop. I was getting code 36. I removed and cleaned the carb as best I could. I can now get about a 5 second run and now only flashing 3. i tried to retrieve codes but only now getting 3. Fuel pump is pumping when priming but I didn't check the fuel pressure due to time.
From searching the net, I find that it is generally a fuel delivery issue and the non rebuildable carb seems to get blamed for a lot. So, is it time for a tech or do I throw a carb at it and hope for the best? I don't have a problem attempting more trouble shooting since I am a cheap bastard but just checking to see if I should cut to the chase with a shop.
Steve
  • d-mac1 wrote:
    Do you guys use Stabil or something in the gas? I'm going to guess they're gummed up from sitting with the el cheapo fuel they sell us nowadays. I put in Stabil most every time I fill the gas tank but if I'm going on a trip I'll give it a good dose of Seafoam to clean it out while we're using it.


    Sea foam
  • Do you guys use Stabil or something in the gas? I'm going to guess they're gummed up from sitting with the el cheapo fuel they sell us nowadays. I put in Stabil most every time I fill the gas tank but if I'm going on a trip I'll give it a good dose of Seafoam to clean it out while we're using it.
  • dieseldan723 wrote:
    I had to replace my carb and at the time I also put in a fuel shut off. Now I let it run out of gas every time I shut it off. Haven't had a problem since.

    I'll be doing this. Good idea. I did get 8 years out of it so I guess I'll spring for a new carb. Can't find it on Amazon though so. Off to Ebay.
  • I had to replace my carb and at the time I also put in a fuel shut off. Now I let it run out of gas every time I shut it off. Haven't had a problem since.
  • Just from personal experience, go on-line to Amazon and buy a new carb. I'm as cheap as the come, infact thought I could use my extended warranty to cover the gen problem, only to be screwed by Camping World, who I'm sure knew that the warranty wouldnt cover it, yet didn't have a problem charging me $175 diagnostic fee! The new carb cost $161. Not only do I have a peace of mind knowing it's new, but also I know how to fix it. It took about 15 min to take off the old and put on the new.

    I had the same prob with my son's ATV and after pulling the carb apart and getting into every crack with cleaner, I still ended up taking it to a mechanic. Again, I would highly suggest order a new carb and be done with it. I wish I would have started there? Just my 2 cents?
  • I have no help for you but it cracked me up when you said you are a cheap bastard! I can relate!! LOL