So I have a 2002 Yamaha fx 140 I got just this year and have been trying to fix it up. It has a bad ecu, I’m waiting on a new one in the mail. Anyways, I see a part in the waverunner that I have no clue what it is and I can’t find the part of information online. I’m adding pictures to this post, the part I’m talking about is the clear tank that says GDO. Could someone please tell me what this is called? And what it does? I’m trying to figure out where is belongs.