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Hi all, have this Ozito chainsaw, which is probably sold under many different brand names, and I have seen many saws with this same carby, so someone may be able to assist. I have four brand new carbs that I have tried, all the same result. I cannot get the primer bulb to pull fuel through the carb to prime. The primer bulb, all fuel lines are new, the fuel tank strainer pickup is clean. I can draw fuel by suction from the tank, but not with the bulb. The carbs are off ebay from China, but I have seen them used on saws before, and they are ok. Just this saw I cannot get right. The carb has a line fitting on the top, which I think would be the pump, and the fitting on the side would be the return, but trying all sorts of plumbing has failed to get the carb primed. I have posted the pic of the carb as it may help to confirm my ideas for the lines. I have tried the line from the tank direct to the top fitting, and the suction nipple on the bulb to the carb side fitting, and the output from the bulb direct return to the tank, but no go. Any help would be great. Many thanks.

Firstly no Ozito products are designed to be repaired, they are 100% use once & throw away items and priced accordingly.
I do not service them because 1 hour of my time is $ 60 & the 2 hours required to repair them exceeds the purchase price.
To understand how they work go to the Walbro web site and download the service manuals using the link at the bottom right of this page.
http://www.walbro.com/parts-services/
Won't hurt to watch the videos up top either.
Ozito comes out of the same factory as Ryobi but they are not the same.
The carbs are a mix of Walbro & Zama to avoid patient infringements as both Zama & Walbro have factories in China, so to repair them you need to buy 2 service kits which exceed the price of a replacement carb.
Under Australian law Bunnings have to supply spare parts for Ozito products they sell for 5 years .
They will lie through their teeth to avoid doing this but the service center can be forced to do.
You will most likely need to make a complaint through fair trading to do this.
Do not expect to be treated like a human being and do not expect to see your parts before your next birthday.

In general the flow goes from the tank to the carb then from the carb to the primer then from the primer to the tank return.
The carb has 2 one way valves in it as dose the primer so they only work one way round.

and remember

BUNNINGS where lowest prices are just the beginning OF YOUR PROBLEMS ( they just forgot the last 3 words )
and have a NICEEE day:smile:smile::smile::smile::smile::smile::smile::smile::smile::smile::smile::smile::smile::smile::smile:

To test put a piece of fuel line on each barb and with a container of fuel above the carb, one line in fuel at a time pump the bulb to see if you have suction. If you do not then they are bad carbs.

Thanks both. The service manual link is very helpful.

The very best EWE Foob videos on hand held carb testing are by Joe Pace who was a teacher a the Husqvarna service school
this is his channel https://www.youtube.com/user/PACEequipment/videos