So i only instaled Kas on ksp to see if the error was becuse other mods butt it isnt... when i link one fuel tank to another there are no keys to clic (out fuel) And( in fuel) +-.....

So im i doing something wrong?

I guess it was fixed long time ago.

Need to start the link from the sending side, then link to the receiving side
(basically a big version of the transfer pipe from propulsion)
Then enable pump here on the sending side.

hey i need help because my pipes not working Pleas help me do screenshot for me what link the pipes with ground pylon or video PLLSS

I have the same problem. After watching the video on the forum thread:
https://www.youtube.com/watch?v=1fDvy1o8VAI
I think it's because you need to link tanks to tanks to transfer fuel. I could be wrong and it would be great if someone can clarify.

In the pic above I think you need to place a tank on the ground pylon and then connect the fuel hoses to it, not the pylon.

I did it through pylons before, but that was on .25

I managed to get it to work through pylons in .090 the other day.

It seems like it works if you link from the main tank/ship to the pylon, then from the pylon to another tank/ship. The link order seems to matter. If you find you can't transfer, unlink all connections and the redo them starting at one end, and work your way, in order, to the other.