Chasing a no run situation, need to verify a few things.

[mopar346]

Good evening all,

It seems I am involved in another 1 ton square body, This is a 87 2WD 3500 tow truck, hydraulic boom and wheel lift, FI454 & SM465 (I think). Fairly solid truck but it hasn't run in about 2 years, pulled into the shop one evening and when they went to back it out the next day it was blowing the ECM2 fuse. They replaced a bunch of iginition stuff and never figured it out. My son in law is interested in buying it but we wanted to make sure it woul run first. A quick list of parts replaced: ECM, dist module, coil, fuel pump relay, fuel pump, rotor and cap, best I can tell that is it. He brought it to me late yesterday and I began to play with it. I jumper wired a 30 amp circuit breaker in the ECM2 fuse hole and it didn't trigger so I knew I wasn't dealing with a hard short. I primed it and got it to fire and run with a little gas to dribbling from the injectors. After that the fuel stopped dribbling, since I knew I wanted to clean out the tanks before I went any further we stopped at that point it we closed the hood and started figuring a game plan. Today I began to track down the fuel issue, found the tank selector switch bad and a bad connection inside the driver's tank at the fuel pump. I repaired all the wiring, cleaned the tank out, jumped the switch and made sure I had fuel at the back of the throttle body. I also removed the injectors, cleaned and tested them. After reassembling everything I have no fire and the injectors wont pulse. I verified power to the coil, swapped out the dist module with a known good one and still nothing, same with the coil. On the off chance my known good module was bad I had the original tested and it was good. Tomorrow I am gonna replace the stator.

Here are my questions.

Is there a good woring diagram posted somewhere on the forum?

Should the injectors pulse once when the key is turn on like the fuel pump relay energizing? Where does it get its signal for this pulse?

Does the injector run pulse come from the stator like the firing pulse does? If not where does the signal come from.

Keep in mind I am an old car guy use to very simple electrical systems and carburators, my electrical test equipment consist of a test light and jumper wires but I'm pretty proficeint with them, not sure I even know how to operate a ohm meter.

Thanks in advance, for reading the whole story and for any advice you can give, Kevin