Any tricks for finding a leak in fuel line ?

So I threw a new fuel line on and still bubbling .. I figured the line might be getting too hot and boiling the gas because there’s a point where it gets real close to the exhaust manifold so I bought some heat insulation shroud stuff from Orielly’s, put it on where I thought it’d be getting too hot and took it for a drive. Same bubbling now I’m going back to thinking there’s a leak somewhere:(