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Injectors could be leaking down and having to reprime.

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Its Tweaked & Twisted
Crazy Spartan on a 112lsa Thumping It, PWR Heads Opening It Up, Coated Pacesetters Doing The Rest, Tuned by Spooldu with DSP
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Have you figured this out yet? I have the same problem with my 99 5.2. I have a new fuel pump, and still have the problem. Im gonna replace the fuel pressure regulator next and that should do it. But if you havent figured yours out yet, id try either a fuel pump or regulator.

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1999 Ram 1500 4x4 318ci, 5spd, regular cab, short bed.
Mods: Flowmaster muffler, hollowed-out cat, 5" Tuff Country suspension lift, 35" tires, LED tailgate bar, Bully truck steps, pocket fender flares, cab lights, black grille shell with red inserts, bug shield, CAI, ported and polished throttle body, and more to come!

I agree either pump or regulator. See if you can get someone to test the psi of the fuel line. Prime it and then let it sit with the gauge on the line. If the psi drops regulator if psi doesn't build fast enough pump or possible hole in the line.

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Mines got the regulator problem, I'm almost positive. With the key on, engine off, pressure jumps up to 50ish, then bleeds down to 0psi eventually. As its runnin, pressure is consistent at around 48psi or so..

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1999 Ram 1500 4x4 318ci, 5spd, regular cab, short bed.
Mods: Flowmaster muffler, hollowed-out cat, 5" Tuff Country suspension lift, 35" tires, LED tailgate bar, Bully truck steps, pocket fender flares, cab lights, black grille shell with red inserts, bug shield, CAI, ported and polished throttle body, and more to come!

Sounds about right.

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