Is it diesel or gas? If it's running the old detroit diesel, you could be looking at a field FCM. It's a computer that controls the fuel pump. It's a common fail point because stock, it's mount right on the fuel pump which sits in the hottest valley the truck has.
Computers + Heat = Failure
If it is, you will need to replace, at that time you may want to look into an FCM relocation kit that would move it outside the hood entirely. If you keep it in there, it will simply fail again. And they are not cheap either. Normally $400-$700 depending on your current and where you live.
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yes the cps does tell ecm when to fire injectors the thing to know is right after all this bucking and stuff starts what is the fuel pressure on the injector rail ???? (caution hi pressure) this would tell you what direction to go in (low to no fuel pressure ,means go back to fuel system parts) normal pressure means go forward to fuel delivery systems
Your truck has an antitheft system called passlock. It runs thru you bcm. When this system fails, your truck will start for 1-5 seconds and then stall. The fuel enable is switched off, and injectors fail to squirt. This may be your problem and is a "bypassable" problem. This link explains.
loosen one fuel line to one of the injectors, try to start the truck and look for the fuel to spray out of the line. it should spray rather hard if the injector pump is working right. if it just dribbles or trickles out you have a weak pump.
Did you change the fuel filter or bleed the injector lines? You need to get that gas out of the system if you haven't already. Once the filter is changed and filled with diesel I would loosen the injector lines and crank the engine until the gas is cleared out of the lines. Tighten the lines and see what happens.
this could be a fuel filter or worse a fuel pump this could be anywhere from 500.00 to 10000.00 . to find out if its the fuel pump you will have to have someone turn the key to position just before engaging the starter and listen for the fuel pump turn on . these are a known chevy truck problem. this could also be a bad injector or dirty ones .
Sounds like the injectors may be bad or just really dirty. You say that the truck is only used as a plow truck, so I would assume that it sits alot. If you dont add any fuel stabilizer to the tank, the fuel will start to degrade and the will gum up your injectors. One thing you can do is to pull the air cleaner assembly off and look at the injectors while the truck is running. Look at the bottom of the injectors while it is running. The injectors shouldbe spraying fuel with a fan spray of fine mist. If you see any drips of fuel in the this fine mist, that injector is at least dirty or on its way out. I would recommend that you change your fuel filter and then get some fresh fuel and the purchase some Seafoam fuel injector cleaner from your local parts store. Dont mess around with anything else. GET SEAFOAM. If it is in a plastic bottle it is not strong enough to do anything. Seafoam is in a metal can. Dump the seafoam in and run the truck as much as you can. This will help clean out the injectors.