FUEL SYSTEMS

A fuel system (100) can include a total flow line (101) configured to receive a total flow and a primary flow line (103) connected to the total flow line. The primary flow line can be in fluid communication with one or more primary fuel nozzles of a nozzle assembly. The fuel system can include a secondary flow line (107) connected to the total flow line in parallel with the primary flow line, the secondary flow line in fluid communication with a plurality of secondary flow nozzles of the nozzle assembly. The fuel system can include a flow split system (111) configured to control a flow split between a primary flow of the primary flow line and a secondary flow of the secondary flow line.