How can I tell if my fuel pump has been updated?

[Billy7871]

I am a new owner operator (may of 2019). I have a 2012 peterbilt 587 with Cummins isx15 cm2250. The man I bought it from said it had a new fuel pump (I think he meant rebuilt) he was very hard to understand. Is there a way for me to know for sure? The fuel lines look at if it has been worked on but that doesn't mean it's been rebuilt. It is painted red like the rest of the engine.