Originally Posted By Stroker Scamp
went back to original gauge and primed with a 3/8 drill 68 psi,
so something made the gauge drop to zero, the hunt is on.
will let you know what I find

Maybe some tiny bit of debris in the bypass valve in the pump making it stick open when it acted up hot? work
I've seen that more than once in BB, they are a lot easier to check also shruggy
Good luck, you will find it up

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)