Onan Surg again!!

[MalMac 1,328]

Alright we have discussed this topic to death. I know aleast with mine its all in the carb. I have two 520's, they both have had the same surg problem. One is now fine but the other has got me thinking its time to junk it. I have cleaned the gas tank to where you could use it to store food in it. Put a new gas line and filter on. I have taken the carb totaly apart 3 times and soak it and ran a number pints of Sea Foam through it. I mow 3.5 acres with it. The tractor will do fine for 2 or three mowings then right back to surging. I get it back to the shop pull the top off the carb clean it and it fine. Then it starts again and I start the whole process over again. This is starting to get way past old. Anybody got any Ideas? I think It is time to junk it. When the Onans run they are great but to me they are just to sensitive to diry enviroments.

[zieg72 209]

Does the surging go away with a little choke added? If so you have a piece of dirt in the carb plain and simple. My 269H does it from time to time, especially if I run it out of gas by mistake. I can usually clear it by running it full rpm and then applying full choke. I do it back and forth and always clears up after messing with it for a while. Good luck.

[stevebo-(Moderator) 8,073]

I found that even cleaning the carb as much as I could did not do it. I bought a new carb on ebay for $100 (new) and it runs perfect now. Save yourself the headache and put a new carb on it if you like the machine. :thumbs:

[Ken B 3,116]

Have you replaced the fuel hoses? They could be deteriorating from the inside. Just an idea :thumbs:

[tranders 0]

Maybe you air cleaner is allowing too much dirt into the carb.

Good luck!

[rickv1957 70]

Have you replaced the fuel hoses? They could be deteriorating from the inside. Just an idea

This very same type problem happened to me a while back,all the cleaners that I had ran though machine to clean fuel system,made hoses deteriorate in inside,replaced and cleaned everything up ,been good 8 years now,Rick

[MalMac 1,328]

Thanks guys for all the suggestions so far. Rick, you might be on to something with the hose's starting to come apart from the inside. I know these hoses are more or less new. I put them on 2 months ago. I have ran a lot of cleaner through them. I was also wondering if you could put 2 fliters on without impeading the fuel flow too much? I think I will put new hoses on and try again. Might have to do what Stevebo suggest. Just worried if I go to and spend money on a new carb I might end up with the same problem. I guess only time will tell.

[stevebo-(Moderator) 8,073]

I have 2 fuel filters on mine and no problems with it.

[Ken B 3,116]

Your welcome.