No Start issue 04 6.0 L
 

I have a 04 F-250 6.0L . Stock completely, other than k&N filter box.. had a hot no start issue. Hooked up scanner, made no oil psi on icp , 30-80 psi max then would go to 0 right away soon after long cranks.

Had done:
Supply tubes and plugs update
New discharge tube on HPP
New HPP

Makes 107 psi max after long cranks no more... any ideas? I pressurized system through ICP sensor with 130 psi.. no leaks and did not leak down.. I'm stumped...relief valve on LPP?