Any part numbers stamped on the fuel pump by any chance?I'm not a 100%sure which it is yet..has the dl sending unit and the 3 nutted connections on flange though. Not sure there is any difference besides sending unit type. Thanks so much for pointing directly at the resources I need. Waiting on parts to make any more progress.
Can't help you with the Power Commander. The only thing I know is that it sits between the ECU and the injectors, increasing the amount of fuel injected at certain power/RPM combinations. On a stock DL1000 the engine should run OK to OKisn (depending on who you ask) without a PC so a normal first troubleshooting step would be to deactivate the PC and take it from there. But in your case, do you know what sort of ECU you have? DL or SV?