STIHL FS 85 - The carburetor does not suck in fuel or sucks in the way it should

Hello.

I have a very big problem with the carburettor FS 85.

A few days ago I replaced the carburetor with a new one (which basically did not do anything), then I replaced the gaskets between the carburettor and the air filter and between the carburettor and the cylinder - nothing.

What is it actually about:
When using a pump, the carburetor does not take fuel from the tank (the fuel pipe normally lies on the bottom of the tank).
I noticed that if you press the pump, it releases fuel through one of the tubes (okay), but if it is released at this point (I think) it should take fuel from the tank and whine as if the tube is in the middle of the carburetor (marked in the picture in red):



Both carburettors (old and new bought on ali) behave the same, although the new one ONE time he took my fuel (maybe he gave it to me, but it was only once after that I did not manage to get fuel again).

First of all, is this how it should behave? Should the carburetor not take fuel from the fuel tube (logic ...)?

And secondly: how to solve this problem, because I'm starting to not believe that I can do anything more about it ...

It looks like there was a problem with valves / diaphragms.
If you have not bought the original, I do not know if it will be something

It's just that the problem is that nowhere else will I find the original: / everywhere quinole ...

Anyway it happened to him once that he caught it and left to work the next day. And the same day for the next day ...

Disassemble the carburetor and check all diaphragms and valves whether they are holding properly

I dismantled the carburetor - probably three or four times. To be sure, I have replaced all the parts that I got with Chinese replacements (basically like a replacement but the logotype on the old carburetor is the same company that sells these carburetors - "zama" or something like that).

Unfortunately, it behaves the same as before

dj_reed wrote:

I noticed that if you press the pump, it releases fuel through one of the tubes (okay), but if it is released at this point (I think) it should take fuel from the tank and whine as if the tube is in the middle of the carburetor (marked in the picture in red):

Are you sure of fuel lines? I had something similar in quinol and the fuel lines were broken in an invisible spot on the rubber stuffing box in the tank once it was ok and once it could not be ignited because it did not consume fuel only air.

Valves can be easily checked by closing the fuel outlet with your finger and pressing the pump in or holding it.

E8600 wrote:

dj_reed wrote:

I noticed that if you press the pump, it releases fuel through one of the tubes (okay), but if it is released at this point (I think) it should take fuel from the tank and whine as if the tube is in the middle of the carburetor (marked in the picture in red):

Are you sure of fuel lines? I had something similar in quinol and the fuel lines were broken in an invisible spot on the rubber stuffing box in the tank once it was ok and once it could not be ignited because it did not consume fuel only air.

Valves can be easily checked by closing the fuel outlet with your finger and pressing the pump in or holding it.

Before you wrote me info about possible wires it occurred to me that there might be something wrong with the fuel filter that is in the middle of the gas tank.

I started to fumble in the fuel tank (a bit of agility you need to have to get him out of the box). I managed to get my grandfather - I cleaned him.

I set everything up as needed and to my surprise, the bubble for gasoline after filling it filled up maybe as high as a millimeter (that is almost at all), but it's always something - I have pressed it so several times and the effect was that it filled up with 2 / 3 millimeters, that is, not much.

I tried to fire the scythe - it went from the kick until I got scared (I was sure it was none of this ).
Of course, it immediately went out because the carburetor was not adjusted at all - so I adjusted it properly and the scythe worked so somewhere 10 minutes at low speed, then I released it a few times high (after a good adjustment it did not go out at all).

I do not know how it is that in other people (eg on youtube or in pictures) the bubble fills up almost completely (there are a few bubbles on top), and in me even when it will be thrown from 20 times, maybe 5% will fill up ( more or less).

The land that works - and the issue that the bubble is not filling up may be the result of problems with the fuel pipes (I bought new ones at the moment and wait for them to reach me).

If I assume new ones, let me know what the bubble filling will look like in this thread.

After purchasing the wires and the filter, unfortunately, the same.

I gave back to the official STIHL website.
It turned out that from the original carburettor after the last cleaning, there was a small eraser that changed the fuel pickup.

There was one more problem (but it was just the last engine seizure that took place the day after I wrote the first post) - the cigar burst into the engine and rubbed it off. Remember to check every now and again (especially when you do not mix the original oil) to check whether the exhaust and the connection of the exhaust with the cylinder does not collect crumb (carbon), which once it will detach and fall into the cylinder at 99% will seize it.

In general, the solution was in the carburetor (the case of a smashed engine is another issue), but I am writing for a warning to avoid a large expense.
The second Chinese carburetor is probably such a beautiful journey, which caught the fuel a few times but then he was already in August and fought the carburetor.

Regards and closing the topic