Ford F-250 Oil Pump Replace/Remove

I Need To Have The Engine Oil Pump Replaced. Parts Cost Very Little. Mechanic Tells Me He Must Remove The Engine. Labor Takes Cost Est Up...

I Need Information To Assist The Replacement Of An Oil Pump On A 7.3 Turbo Deisel.

1. How I Determine If The Oil Pump Is Faulty? 2. If It Is Faulty, What Are The Steps To Remove And Replace The Oil Pump?

When Engine Is Cold Oil Preasure Is At 30 Psi After Engine Warms Drops To 2 Psi I Changed The Oil Pump With A High Volume Same Probelem When...