Gen 3 Dodge Ram 5.9 2500/3500 How to Diagnose a faulty Common Rail Pressure Relief Valve - MUST HAVE

If you RAM 2500 or 3500 with the Common Rail 5.9 Cummins is hard to start or just won't start at all, you may have a faulty pressure relief valve.
There's a few suggestions online showing how to diagnose a faulty pressure relief valve, but this may leave you with an incorrect diagnosis.
Here's how you can diagnose this quickly and simply and also gives you a part you will probably want to keep with you in case your PRV ever decides to die.
Use this with your own discretion and caution. The pressure relief valve is a safety mechanism installed by Cummins to protect the fuel rail and injectors. While many suggest blocking it off, this is something you should consider yourself before doing it.
This video will tell you how to diagnose the PRV, but use your own caution and discretion before attempting.
And be extraordinarily careful. The Common Rail fuel pressure is extraordinarily high and can cause severe injury if not handled with the respect it dese
Follow all safety precautions and if in any doubt, see your appropriately qualified mechanic.