Oil pump is going, will that cause a rod or a valve to start tapping?

What is your question?

I just bought the truck and 2 days later, I went to the mall (had to climb a steep hill). When I came out to leave, started the truck and noticed the tapping. But after a while the tapping quieted down and went away.

How long has your 1998 Chevrolet S10 had this problem?

Just bought the truck and noticed this problem 2 days later