i stil have this problem

the engine only start when i the cold starter injecter is ON when the cold starter injecter is OFF the engine cut directly off

my thermo switch sensor is ok
my engine temperatur sensor is also ok i check the ohm


i turn the CO screw maximom to the right but then turn it back well i don t know where i am now with the co srew if it is rich or poor ..

well i need help..

maybe my fuel pump?