Chevrolet Repair: 2001 blazer 4.3 vortec, camshaft sensor, change lighting

Question
QUESTION: I have a blazer that will not start. it gets fuel to the intake but the injectors are not working, I replaced them and that did not fix the problem. When I prime it, it will start and run until the gas is used up. someone told me that the camshaft sensor tells the injectors when to spray and that if it is bad they will not spray right and that could be the issue. Is that true??? and if so where would i find the sensor???

ANSWER: Did you get a check engine light? If the cam sensor is bad it will throw a code. The sensor is located in the distributor The camshaft sensor send a signal to the ecm and the ecm tell when to fire

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QUESTION: There was not a check engine light. I just shut it off and it would not start again. Does the camshaft sensor control when the injectors fire? If not What does? There also are not any fuses or relays that say anything about injectors. What fuse or relay runs them if there is not one labeled injectors.

Answer
Sorry for the delay I went to my shop and pulled a copy of the wiring diagrams If you can get to where the injectors plug in to the engine circuit and have some one turn the motor over and look for pluses. if that happens the cam sensor is fine and the problem is with the spyder, the centralized injector system in the Vortex, The circuit is engine one or PCM. Was there any reasons for this a recent dead battery? Alternator change? Lighting Strike? The reason I ask this is any type of a voltage spike could smoke your ECM requiring replacement