Have you read through the TM9-2320-280-20-1 w/c 2, Troubleshooting procedures? Is the return line from the injector open, not blocked as this causes an imbalance in the Injection pump and will not let it start. For example in the above mentioned TM check page 2-106. This is in the middle of the troubleshooting chain but you can look at the rest of it later. The TM's are available in Steelsoldiers. Hope this helps.