Vent: went with the stock lift pump over the upgraded one on my 5.9 and now I'm chasing a low rail pressure code at 1,800 rpm

Brian Thompson · 2026-10-21T00:20:03.087444+00:00

Trying to save $220 on a part I'll probably have to swap anyway. Anyone run into a low pressure code right in the cruise range and figure out if it's the pump or something farther up the line?

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Vent: went with the stock lift pump over the upgraded one on my 5.9 and now I'm chasing a low rail pressure code at 1,800 rpm | Diesel Performance - Guest Forum