Does the Rancher FI have an additional filter screen where the fuel comes in? Some injectors do and they can clog with trash and effect fuel flow. Maybe there is a diagram of the injection in the manual showing all parts of it,,or someone here has cleaned one before and could tell you. A fuel pressure check would be a good idea. You can make your own,,do a search on YT to show you how,,,its not expensive to make one. Good luck.
05 Suzuki DR650, Mikuni TM40 flatslide pumper carb,JE 10.5:1 piston,stage 2#190 Webcam,open airbox, Twin Air,full FMF system,Pingel fuel valve,Ricor Racing rear shock, Ricor Racing fork Intiminators, Progressive springs, Sargeant seat,DRZ250 tailight,custom plate,LED's,GPS,sumo fender,PT bars,Cycra brushguards IMS lowered pegs, aluminum skid,bearing chain roller,Pirelli,tank bag(gone)
06 Zuk KQ700, Kenda Bearclaw HTR radials Warn RT25 w/ syn. line, 1.5mm clutch shims