Hello dear scooter screwdriver. Leonardo 125ccm BJ 96 EZ. July 96 I try here once to describe how I understand the function of the vacuum gasoline pump and the connected hoses, I call the 3 hoses on the pump A, B, C. Hose A with filter to the pump via membrane through vacuum.. Hose B from intake nozzle to tank to pump to pull the membrane down by vacuum and fill the room above with gasoline. At the end of the U-pressure, the fuel will you So much for my idea of the process in the tank, because the pump is installed in the tank. If I look into the not full tank I probably see the U-pressure hose, is that right? In an earlier article by me I had described the problem that the scooter did not sprung any more with really full tank and there was pointed out the, possibly porous or cracked vacuum hose. I would have the d The next effect of the said Maroden hose, no problems with normal driving, with longer driving at a higher speed 70,80,90 it may happen that the membrane does not have the same effect as the previous one, but it does not have the same effect as the previous one. t is pulled far enough because the hose pulls the wrong air out of the tank and thus the additional tank is no longer supplied enough and then the carburetor does not. If I have understood the problem so correctly, then I ask for confirmation. If not then please correction. A big thank you to all interested for your answers and stay healthy. Peter