Help with water pump calculations

[AdamM]

So i have this Diesel Water pump, i need to achive a pressure of 4 bars at the end of the hose, How to calculate the pressure in inlet to achieve the desired result of 4 bars at outlet.
(Assuming that I'm using a standard hose of length 30metres, with a diameter of 2.5 inches)
Pump FLOW RATE IS Q=1000GPM

 

[JBA]

Goggle: "flowing friction factor for rubber hose" and scroll down to " (pdf) Determination of Fire Hose Friction Loss Characteristics - NFPA