High pressure in the diesel system
The high pressure pump builds the high pressure and delivers it to the fuel rail manifold where it flows through the injector lines and injector connector tubes to the injectors. The fuel pressure regulator (fuel control actuator) in the high pressure pump controls rail pressure. The injectors have a hollow check ball that holds rail pressure until the fuel solenoid is actuated by the ECM, this allows the check ball to rise off its’ seat and an injection to take place. If the injector connector tubes, where they seat into the injectors, leak or the check ball in the injector is leaking or the high pressure limit valve then it will not build enough rail pressure to start the engine. It takes approximately 4000 PSI rail pressure for starting.
CAUTION
The fuel system contains high pressure fuel up to 26,000 PSI. Do Not use you fingers to find leaks! High pressure fuel entering your bloodstream may result in amputation or loss of life.
Now, do you have a question?
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It is designed to work at high pressures.
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Do people that visit here think they are going to be charged by the word?
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Or they think 10 character minimum is the maximum.
Or maybe by the letter. 
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I would like to buy a vowel.
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Problematic diesel injection pumps – most makes, not just Dodge – are a not uncommon complaint here. The forum search feature will tell you what other posters have said, link upper right this page.
That will be $100. Unless its a “y”, it will be half price because its not always a vowel.
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