Performed a low side fuel pressure test on a 2019 ford f-150 due to fault code p0087 low fuel rail pressure. The engine is the 3.5l v6 turbo charged model. Specs state 58-75 psi at idle. Guage was doing some strange things. Upon initial startup fuel pressure would jump above 80psi and then drop to 55psi at times then shoot back up between 75-80psi and stay there. Fuel pressure wouldn’t bleed down after 15 minutes more than a couple psi. I’m assuming the test is a good result. Just wondering what your opinion may be. 

It looks like the valve cover gaskets were replaced in the recent past which requires removing the high pressure fuel pump. I can see fresh silicon between the valve cover and sealing surface and a missing bolt for the high pressure fuel line at the rear of the engine. I’m assuming that the high pressure pump may have been installed unevenly or with the cam lobe in the incorrect position which may have damaged it. Fuel pressure desired and actual were off by a bit and indicated less than desired fuel pressure form the high pressure side. 

Low pressure Fuel pressure test on 19 ford f-150 3.5l v6 opinions?