Fuel line came off the nipple inside the tank, the end of the tube was perfect, was my first drive with nb48, so everything was brand new.

The stock lines are very soft and loose like you said mr240, specially on the nipple inside the tank.

I was on the track this morning, I put another piece of line and the end of the fitting to make it tighter, works great so far, But also I'm gonna try different brand of line. I like the soft ones inside the tanks so the clunk can turn easily upside down.

If this doesn't solve 100% the problem! I would say the fittings on the tank needs to be a little sharper.