Medium and Heavy Trucks
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It sounds like the engine is firing and running for a short time and then quits, correct?
The fuel injection pump has a solenoid on it that has two circuits. One is to PULL the solenoid in (high curren/low resistance coil in the solenoid), and the other is to HOLD the solenoid once pulled (low current/higher resistance coil).
The pull turns on by a relay and is on only for a few seconds at key ON and Crank, then the PULL circuit turns off and just the HOLD circuit is ON for as long as the ignition switch is in the ON position to keep the engine running.
I believe you may have a faulty fuel solenoid, OR the HOLD circuit may be open circuit and not putting 12 volts to the HOLD circuit of the solenoid.