Crank no start, no codes

Powerstroke Man 6.4

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Crank no start, no codes

FRP is showing 15-200 psi erratically constantly jumping back and forth koeo and will never settle down (not cranking sitting still.) and when cranking on it, the RP sensor still acts the same and can't get a constant reading. Desired is 5500

Upper fuel bowl fills up quick when key is turned on. (fuel bowl is clean, no metal).

Used OEM HPFP pump pulled out of a running engine with 50,xxx miles.

Same for injectors (new injector lines and hpfp harness.)

It's a buddies truck, just trying help him figure it out.

Any ideas

TIA
 

6.0 Tech

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Could be an frp. I would start by bleeding both the low pressure and hi pressure sides of the fuel system, see if that gets it running. Low pressure is bled with the schrader valve, hi pressure needs a pass thru banjo bolt and a hose ran into a container.
 

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