I know this may seem obvious to some but this is a commonly over looked part of a build....
After a lift, fuel linesgenerallyyaren'tteffectedd unless a body lift isexecutedd then lines can becomestretchedd or chafed...Check this..
Check your fuel filler hoses .... Buggy whips and revolveshackleal set ups cainter fearar with the filler in a big way (as the filler hose passes through the spring arch)...
Some leaks can be located easilyaly as looking under the car at idle See se if it is spotting....
Couldcoincidententa,l but if it didn't have this problem before the lift ,Iprobablyubly being caused by the lift...
Hope this helps....Bopxcar...