Everyone thanks for the inputs, I tried all of the ones you gave me, with no joy. Even though I have a Cummins 315 ISC, the pump is very specific and after talking to many companies and shops they did not know of one that would fit and could not find a used rebuilt one either. The shop I am at found a new one that they can get in 8 days instead of 16 weeks, but will cost me twice a much. Good thing my Insurance is paying for it. Thanks for all your help and I will continue to look into replacement option just in case.
Heather
2001 Monaco Knight 36R