Bit confused here. I assume you had a problem with diesel generator, and replaced the fuel pump. WHY??
What was the problem? you say it was running before, so again WHY? Why did you replace fuel pump, if it was running? IF you can post again, with more details, as to why you replaced the pump, what was the problem etc etc etc Might not be anything to do with pump. But all you say is cannot start after changing pump, but ok before, So again WHY change it?? Could be the way you have fitted the pump if ok before
SD
August 2012