Renault Express challenge, 1.4 Energy

Good afternoon:
Here is a challenge.
A month ago my (Renault Express 1.4 Energy monopunto) I didn't want to start, good battery, starter engine well ...
Entering carburation I realize that as the unique it starts it is injecting some direct gasoline to the carburetor, after that you can be walking with it all day without problem, whenever you do not stop more than an hour, if so you have to inject another little gasoline.
I take it to a friendly workshop where the breakdowns detector connects, it indicates four carburation errors, and apart it blocks the ordering of diagnosis.
Carburer disassembly, clean thoroughly, new filter change, clean injector ..
After changing the filter I spent a few days that started me without problems, but it has returned to the breakdown.
Not even the house with the breakdown.
Can anyone help me?
I attach some photos
, in one of them you will see the step that I have to do to download that little gasoline.
Thanks in advance.
A cordial greeting