Hi all. I have an older string trimmer - Ryobi 780R. I have replaced all fuel lines on it. The return line is simply pushed inside the plastic gas tank through a hole on the bottom of the tank - a very iffy connection. When things get hot the gas begins to leak out of this connection - where the fuel line goes inside the tank. The fuel line I use is the yellow transparent line 3/16 OD x 3/32 ID. Any ideas on how I can fix this? Thanks.