I have a Shindaiwa T260 trimmer which leaks gas around the fuel tank grommet. Even when the trimmer gas tank is turned up and the fuel tank grommet is above the level of the fuel, I can see air bubbles coming out between the grommet and the tank. I notice this when the tank is in the sun. The grommet feels soft so I didn't know, so I was wondering whether the grommet is likely the culprit or if there is a vent that is stopped up. I wasn't sure if the tank cap vents this or if the breather body could be bad. This leaking of air would stop when I removed the gas cap. I did try a gas cap from another trimmer which didn't have the same problem and it didn't solve the problem. I tried to attach the parts breakdown in case I didn't describe the parts properly. Thanks for any suggestions. I looked at the fuel lines and they don't seem to be leaking.