low fuel pressure on cold start

Hello,

Weak/low fuel pressure can be due to a restriction in the fuel line, it could be a bad fuel pressure regulator, clogged fuel pump. It can also be a weak fuel pump that is unable to provide enough fuel.
If you are only experiencing low fuel pressure on cold start it could be a bad regulator.
What pressure reading are you getting when cold?

With the key on and engine off this vehicle should have 35-70 PSI of fuel pressure.

Here is a guide on how to test the fuel pressure:

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

I have attached the fuel system diagram for your reference.

Please let me know of any questions.
Thank you.