Codes P0087 and P053F, Fuel system repair help needed?

Hello,

P0087 - fuel pressure too low
P053F - fuel pressure too low on start

The fuel delivery system is made up of the low-pressure pre-delivery system, comprising of an in-tank fuel pump and fuel filter. the high-pressure fuel system comprises of the high-pressure fuel pump and the fuel rail with direct injection injectors and fuel rail pressure sensor connected

The in-tank fuel pump will deliver fuel from the tank to the high-pressure fuel pump. The low-pressure system should supply fuel at about 5bar/73 Psi. This can be checked using a fuel pressure gauge connected to the supply line to the high-pressure pump

How to:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If the pre-supply pressure is correct then next the high-pressure pump is either not generating enough pressure, faulty pump or mechanical issue with the activation from the cam follower or worn camshaft. If the mechanical side is in order, we could have an issue with the rail pressure sensor not reading correctly. With ignition on/engine off the rail pressure sensor should read the in-tank fuel pump pre delivery pressure. This can be verified using a suitable diagnostic scan tool which can read live data from the ECM.

A video:
https://youtu.be/lF4BSTl_S5w?si=KRieqorjMEbkQaxd

The rail pressure sensor is located in the fuel rail underneath the intake manifold
You will need to remove the manifold to gain access

A video:
https://youtu.be/LVPvdiYDRh4?si=UezVBBa6CGqrbRtY

Hope this helps.

Cheers, Boris